1

Resposta de referência

The big brother of HTTP, HTTPS stands for Secure HTTP (not to be confused with HTTPS, a separate protocol). HTTPS, which was created for identity verification, uses SSL certificates to confirm the server you are connected to is authentic. Although HTTPS has certain encryption capabilities, they are typically judged insufficient, and additional encryption methods are preferred whenever practical. TCP port 443 is used for HTTPS transmission.

2

Resposta de referência

A load balancer distributes traffic across cloud instances, ensuring high availability and performance.

3

Resposta de referência

I handle network monitoring and alerting by implementing monitoring tools that provide real-time visibility into network performance and health. I configure alerts for critical events, such as device failures, traffic spikes, and security breaches. Regular review and analysis of monitoring data help identify potential issues early and ensure prompt response to any network anomalies.

4

Resposta de referência

Mainly there are four types of networks. These are: 1. Personal Area Network (PAN) The Personal Area Network (PAN) is considered to be the fundamental form of computer networking. This network is limited to an individual user, meaning that the exchange of information among computer devices is limited only to the user's personal workspace. The PAN technology allows communication between devices within a range of 1 to 100 meters from the user. The transmission speed is relatively high, and its maintenance is simple and cost-effective. 2. Local Area Network (LAN) LAN is a type of computer network that connects devices within a limited geographic area, such as a home, office, or school. LANs allow users to share resources, such as files, printers, and internet access, among the connected devices. One of the basic examples of Local Area Network (LAN) is a printer connected to a computer. The maximum range of the system is 1-10 kilometers, and its transmission speed is significantly high. 3. Metropolitan Area Network (MAN) The Metropolitan Area Network (MAN) is a network type that covers the network connection of an entire city or connection of a small area. The area covered by the network is connected using a wired network, like data cables. This network mainly uses FDDI, CDDI, and ATM as the technology, ranging from 5km to 50km. Its transmission speed is average. It isn't easy to maintain, and it comes with a high cost. 4. Wide Area Network (WAN) WAN is a network that connects devices over a large geographical area, such as different cities or countries. WANs typically use public or leased telecommunication lines to transmit data. Examples of WANs are the Internet, corporate networks, and satellite networks. In most cases, the connection is established through wireless means and relies on radio towers for transmission. WAN is a collection of Local Area Networks (LANs) that are connected with each other over a distance above 50 kilometers.

5

Resposta de referência

- To do this you will need some sort of bridge between the wireless and wired network. This can be accomplished either with a hardware access point or a software access point. Hardware access points are available with various types of network interfaces, such as Ethernet or Token Ring, but typically require extra hardware to be purchased if your networking requirements change. - If networking requirements go beyond just interconnecting a wired network network to a small wireless network, a software access point may be the best solution. - A software access point does not limit the type or number of network interfaces you use. It may also allow considerable flexibility in providing access to different network types, such as different types of Ethernet, Wireless and Token Ring networks. Such connections are only limited by the number of slots or interfaces in the computer used for this task. - Further to this the software access point may include significant additional features such as shared Internet access, web caching or content filtering, providing significant benefits to users and administrators.

6

Resposta de referência

QoS prioritizes certain traffic types (e.g., VoIP) to ensure bandwidth and low latency, improving performance for critical applications.

7

Resposta de referência

I implement QoS by configuring network devices to prioritize certain types of traffic based on predefined policies. This involves setting up traffic classes, defining priority levels, and applying policies using techniques such as traffic shaping, queuing, and policing. QoS ensures that critical applications receive the necessary bandwidth and low latency, improving overall network performance and user experience.

8

Resposta de referência

Some of the common types of LAN cables that are used in networking are CAT 5 and CAT 6. CAT 5 provides 100 Mbps of speed and CAT 6 offers 1 Gbps of speed. However, the three major types of network cables are coaxial, fiber optic and twisted pair. A cross cable is also called a crossover cable that is used for connecting two similar devices for communication without the help of a hub or a switch.

9

Resposta de referência

First, I would express empathy and sincerely apologise for the client's unfortunate experience. My next step would be to actively listen to their concerns, asking relevant questions to gain a deeper understanding of the situation. I'd maintain a composed and respectful demeanour, even in the face of the client's anger or frustration. I would take full responsibility for the situation, set realistic expectations and propose a solution that addresses the client's needs and preferences. After resolving the issue, I would follow up with the client to ensure they were satisfied with the resolution and implement measures to prevent similar incidents in the future. Taking this comprehensive approach aims to foster positive client relationships and reinforce the commitment to exceptional service.

10

Resposta de referência

A hub is a simple device that broadcasts all incoming traffic to every connected device, leading to collisions and poor performance. A switch learns MAC addresses and forwards traffic only to the intended recipient, improving efficiency. A router connects different networks and routes traffic based on IP addresses, enabling communication between networks and providing network segmentation.

11

Resposta de referência

A load balancer distributes traffic across servers.

12

Resposta de referência

Look for familiarity with firewall rules, access control lists, and common security protocols. Candidates should be able to explain how they would configure a firewall to protect a network from specific threats.

13

Resposta de referência

Network topology refers to the organisation of components within a communication network. This structural representation illustrates nodes, devices, and network connections, which can be physically or logically arranged to demonstrate their interrelationships. For example, in a mesh topology, every device within the network is directly interconnected with each other device, creating a comprehensive and redundant network structure. As a result, every device in the mesh topology must possess a minimum of two network connections to facilitate seamless communication and ensure reliable data transmission. Engineers can design and optimise networks by understanding topology to efficiently meet their intended purposes.

14

Resposta de referência

First, I'd gather information: Is it affecting all users or specific ones? Can they reach some resources but not others? This tells me whether it's a widespread outage or something more specific. Next, I'd check the monitoring tools we have in place—Nagios or SolarWinds—to see if there are any alarms firing. Then I'd check the core infrastructure. Is the main router up? Are the core switches passing traffic? If the core infrastructure looks healthy, I'd check departmental switches and access points. I also immediately start looking at recent changes—did someone deploy a new configuration or reboot a device? I remember one outage where it turned out a VLAN trunk port on a switch had been accidentally reconfigured. While I'm investigating, I'd communicate with the help desk about what I'm finding so they can manage user expectations. The key is being methodical rather than panicking and making it worse.

15

Resposta de referência

The candidate should identify common beamforming issues, such as improper calibration, client compatibility, or coverage imbalances.

16

Resposta de referência

To troubleshoot network connectivity issues, I follow a systematic approach. First, I verify the physical connections and ensure that all cables and devices are properly connected. Next, I check the device configurations, including IP addresses, subnet masks, and gateway settings. I use diagnostic tools such as ping and traceroute to identify where the connectivity breaks down. I also review network logs and monitoring data to identify any errors or anomalies. If necessary, I escalate the issue and collaborate with other network engineers to resolve it.

17

Resposta de referência

- Up to 54Mbps.

18

Resposta de referência

A trunk port carries multiple VLANs.

19

Resposta de referência

Higher transmit power extends the coverage area of an access point, allowing it to reach more devices and cover a larger space. However, excessive power can lead to interference with other networks and reduce overall performance.

20

Resposta de referência

IPX, or Internetwork Packet Exchange, was a fairly lightweight protocol, which was advantageous given the limitations of computers at the time. It is a TCP/IP rival that performs admirably in small networks, has little to no configuration, and does not require components like DHCP. However, it does not scale effectively for applications like the Internet. As a result, it was abandoned and is no longer a necessary protocol for the majority of pieces.

21

Resposta de referência

I use ticketing systems, assess impact, and address critical issues first while documenting progress.

22

Resposta de referência

A CDN accelerates content delivery from cloud services by caching data at edge locations.

23

Resposta de referência

There are three important topologies for networks: BUS topology: Each computer in a BUS architecture connects to a single line of principal network cables. It's affordable and simple to set up, comprehend, and extend. STAR topology: A single hub connects every system, making it easy to troubleshoot and reinstall. RING topology: A single computer connects to two other computers from the rear and front ends. When all computers connect, they form a ring-like structure. This ensures equal access to network resources for all computers and less signal degradation compared to other topologies.

24

Resposta de referência

5GHz Frequency.

25

Resposta de referência

A firewall is a network security device that supervises traffic entering and leaving a network. Its primary purpose is to create a barrier between the internal network and external sources to avoid malicious traffic, like viruses or malware.

26

Resposta de referência

QoS refers to the prioritization of certain types of traffic or users in a wireless network to ensure reliable service, especially for latency-sensitive applications like voice and video. It is achieved through traffic management, resource allocation, and scheduling.

27

Resposta de referência

H.323 is a standard for multimedia communication over IP, including VoIP and video conferencing.

28

Resposta de referência

Wireshark captures and analyzes network packets in real-time, helping identify issues like latency, errors, or malicious traffic.

29

Resposta de referência

A firewall filters network traffic based on security rules, inspecting packets and blocking unauthorized access while allowing legitimate traffic.

30

Resposta de referência

The 802.11n standard improves wireless network performance by introducing features like MIMO (Multiple Input, Multiple Output), channel bonding, and higher data rates. It enhances throughput, range, and reliability compared to previous standards.

31

Resposta de referência

Domain Naming Service, or DNS, is used to translate between names and IP addresses. While we can easily recall names, the computer can only understand numbers. Therefore, we give computers and websites names. When we use these names (such as yahoo.com), the computer converts the request to an IP address (a number) via DNS. - "A" record: This is a host record and maps a name to an IP address. It uses the DNS record of the Domain Name System (DNS) to obtain a name's IP address. - "MX" Record: MX, or mail exchanger records are required to identify the network's mail servers.

32

Resposta de referência

DHCP (Dynamic Host Configuration Protocol) automatically assigns IP addresses and other network configuration parameters to devices, simplifying network management.

33

Resposta de referência

I perform regular vulnerability scans, patch systems, and review logs for unusual activity.

34

Resposta de referência

NAT (Network Address Translation) translates private IP addresses to a public IP address for internet access, conserving public IP addresses and providing a layer of security.

35

Resposta de referência

To optimize a WiFi 6/6E network, it's crucial to understand the network's demand and design the infrastructure accordingly. Utilizing 1024-QAM for better data transfer rates and coordinating the OFDMA correctly is crucial. Moreover, to achieve optimal range, the placement of equipment and proper use of high-frequency ranges, such as the 6 GHz band, will be a key strategy in the optimization of these networks.

36

Resposta de referência

Gateways typically operate at the network layer, though they can function across multiple layers depending on their configuration. They connect networks using different protocols, facilitating seamless communication between them. This versatility makes gateways a crucial component in heterogeneous network environments.

37

Resposta de referência

This question assesses your knowledge of how data is encoded for wireless transmission. Managers want to see that you understand the evolution of these schemes and their roles in different 802.11 standards. Provide a high-level explanation of each scheme, differentiating between them.

38

Resposta de referência

1) Basically there are many standards of Wi-Fi in the industry but some popular of them are 802.11a, 802.11b, 802.11g/n. With the support of these Wi-Fi protocols we can communicate/interact among the devices at the speed of 5Ghz to 2.4Ghz dual band communication. 2) If we have Wi-Fi nic card so firstly we have to install their drivers and after installation if we have Wi-Fi access point then we can see the signal strength in the right corner below just open that and find the access point to connect, if access point is configured with the security, type the key to connect and enjoy the service. 3) Wi-Fi is technically referred to as the 802.11 protocol. Over time, Wi-Fi has improved, giving rise to different variations of the protocol. 802.11a – This version operates at 54Mbps. It is considered as the favorite wireless LAN protocol for IP telephony.

39

Resposta de referência

Before getting into the detailed answer, first remember these 3 words: SYN, SYN-ACK, ACK. Talking about TCP. Before any data is sent ove to TCP, the client and server are expected to make sure that the connection is reliable. In this case, TCP uses a three-way handshake method where it establishes a connection where both sides are ready to send and receive data. Here's how it goes: 1. A client, say your browser wants to connect to a server. It starts by sending a SYN packet. Along with this, it includes an initial sequence number basically saying, “I want to start a connection, and here's where my data numbering begins.” 2. The server receives this and responds with a SYN-ACK. Two things take place here, it acknowledges the client's sequence number and also sends its own sequence number back. 3. Now the client sends a final ACK, confirming that it received the server's sequence number. 4. At this point, the connection is established, and data transfer can begin. You might wonder why 3 steps are required here instead of 2 And it is because both sides need to confirm two things, and that is if they can send and receive. With only two steps, the server wouldn't know if the client actually received its response. Once communication is done, the connection is closed using a four-step process, i.e, FIN - ACK - FIN - ACK, which is slightly more involved. Here's what you might get asked during the interviews for a follow-up: Q. What happens if the SYN-ACK is lost? Your Ans: The client waits for a timeout and then retransmits the SYN packet. Q. What is a SYN flood attack? Your Ans: It's when an attacker sends a large number of SYN requests but never completes the handshake. This leaves connections half-open and can exhaust server resources.

40

Resposta de referência

Unicast Probe Request: i) Destination address is ff:ff:ff:ff:ff:ff and SSID field is set to target AP's SSID. Or ii) Destination address is set to target AP's MAC address and SSID field is set to target AP's SSID. Unicast probe request SSID field is always set to target AP's SSID.

41

Resposta de referência

A wireless mesh network consists of multiple access points that communicate with each other to form a self-healing, redundant network. Each AP acts as a node that relays data, extending coverage and improving network resilience.

42

Resposta de referência

A point to point link is a connection between two dedicated networking devices. The complete bandwidth of the link is utilized for the transmission of data between two devices. There may be multiple connections between devices. Using a PPP link, two different networks can be connected, where one network will work as the endpoint for another. These days PPP links are created using modems and PSTN (Public Switched Telephone Networks). An example of a PPP link is a telephone call between two people.

43

Resposta de referência

SIP (Session Initiation Protocol) sets up, manages, and terminates voice and video calls over IP networks.

44

Resposta de referência

Two transmission media are available: guided and unguided. Guided Media, such as twisted-pair, coaxial cable, and fiber-optic cable, act as a conduit from one device to another. Any of these media's physical boundaries direct and confine a signal as it travels along them. Metallic materials that accept and transport signals in the form of electrical current are used in twisted-pair and coaxial cables. A glass or plastic cable called an optical fiber accepts and transmits signals in the form of light. Unguided Media is wireless media that transmits electromagnetic waves without a physical conductor. Signals can be sent through the air. Radio communication, satellite communication, and mobile telephony are used for this.

45

Resposta de referência

Catalyst switches are for enterprise access, while Nexus switches are designed for data center environments with high performance.

46

Resposta de referência

In a previous role, we experienced a network outage that affected multiple departments. I worked with the IT, server, and application teams to identify the root cause, which was a misconfigured switch. Through collaborative troubleshooting, we resolved the issue, restored network connectivity, and implemented measures to prevent future occurrences. Clear communication and teamwork were essential to resolving the issue quickly and effectively.

47

Resposta de referência

I have the technical, analytical, and problem-solving skills to troubleshoot network problems and resolve issues quickly and efficiently with little to no downtime for the end user.

48

Resposta de referência

Check QoS policies → ensure RTP traffic is marked EF → verify queues and drops in show policy-map interface → confirm no microbursts on interface.

49

Resposta de referência

Cognitive radio is an intelligent wireless communication system that dynamically adapts its transmission or reception parameters based on the environment to avoid interference and optimize spectrum use. It is used in dynamic spectrum access and next-generation wireless networks.

50

Resposta de referência

A backbone network is a network that has the connectivity infrastructure that is the main link for the various parts of a network. It has the capability of supporting networks spread over vast geographical areas. It can connect different networks within the same area or building, or different buildings within an area. Typically, a backbone network comprises routers, bridges, gateways, and switches.

51

Resposta de referência

A computer network is a group of interconnected devices that communicate and share resources with each other.

52

Resposta de referência

Firewalls are a kind of network security technique used to restrict unauthorized access to the network. A device or program that is capable of filtering both incoming and outgoing data within a private network, applying a predefined set of regulations to identify and prevent cyber threats. They serve as an essential element of network security. The majority of operating systems are equipped with a rudimentary integrated firewall. However, the utilization of a firewall application from a third-party source offers enhanced protection measures. Working: Firewalls are used to monitor and control the flow of network traffic. It evaluates and determines what traffic to allow or restrict on a specific set of regulations. The firewall can be understood as a guard placed at the entry of a computer system, carefully allowing entry only to authorized sources or IP addresses within the network. The regulations are derived from various factors as specified by the packet data, such as their origin, destination, and other relevant attributes. In order to prevent cyberattacks, traffic originating from suspicious sources is blocked.

53

Resposta de referência

In a previous role, we experienced a major network outage due to a misconfigured core switch. The outage affected multiple departments and critical services. I quickly identified the issue by reviewing configuration changes and network logs. I reverted the misconfiguration, restored connectivity, and conducted a thorough analysis to prevent future occurrences. I also communicated with stakeholders to keep them informed and implemented additional monitoring to detect similar issues early.

54

Resposta de referência

- DTPC: Adjusts transmit power of APs and clients to ensure balanced communication and save battery life.

55

Resposta de referência

I handle network compliance audits and assessments by preparing comprehensive documentation, conducting internal reviews, and ensuring all security controls and policies are in place. During the audit, I work closely with auditors to provide necessary information and address any findings promptly. Continuous monitoring and regular internal assessments help maintain compliance and readiness for external audits.

56

Resposta de referência

Port Security restricts switch port access.

57

Resposta de referência

A three-way handshake is used in TCP/IP to establish a reliable connection between a client and a server. It begins with the client sending a SYN packet to the server, signaling a request to establish a connection. The server responds with a SYN-ACK packet, acknowledging the request. Finally, the client acknowledges the server's response with an ACK packet. After this, the connection is established.

58

Resposta de referência

- Although wireless networking offers obvious benefits to users of laptops who move from location to location throughout the day, there are benefits for users of fixed position computers as well: - So this is not such that wireless networking is only good for laptop computers but on preference basis it got more than fixed positions, as laptop computers are portable, flexible, ease to use and move. - Many schools and businesses have unsuitable building layouts or walls that cannot be wired for various reasons making it difficult or impossible to build a wired network. Wireless networking in these environments is a very cost effective alternative also providing future flexibility. - In cases where a small number of computers are separated from a main network a wireless link may be more cost effective than network cabling although the latter is perfectly feasible. - Temporary wireless LANs can easily be created for exhibitions, school or business projects, all without any trailing cabling.

59

Resposta de referência

This question assesses project management and technical skills. Candidates should detail the planning, execution, and results of a network upgrade. Look for evidence of successful outcomes and lessons learned from challenges faced.

60

Resposta de referência

At my previous position with Singtel, we faced significant interference issues in a densely populated area affecting our 4G network performance. I conducted a thorough site survey using spectrum analyzers to identify the source of the interference, which turned out to be from nearby commercial installations. By collaborating with the facilities management team, we adjusted the antenna orientation and implemented additional filtering solutions. This resolved the interference, resulting in a 30% improvement in signal quality and user satisfaction. This experience taught me the importance of cross-department collaboration.

61

Resposta de referência

I handle IP address allocation and management by using DHCP (Dynamic Host Configuration Protocol) to automate the assignment of IP addresses within the network. For static IP addresses, I maintain a detailed IP address plan and document all allocations to ensure there are no conflicts. Additionally, I regularly review and update the IP address plan to accommodate network changes and expansions.

62

Resposta de referência

Wi-Fi vs Bluetooth: Wi-Fi is for high-speed internet access; Bluetooth is for short-range communication between devices.

63

Resposta de referência

Beamforming directs the wireless signal towards specific devices rather than broadcasting it in all directions. This focused signal improves signal strength, range, and data rates, resulting in better performance and reduced interference.

64

Resposta de referência

A mesh network is a type of wireless network where devices (nodes) communicate directly with each other, forming a web-like structure. This creates multiple pathways for data to travel, increasing network reliability and coverage.

65

Resposta de referência

A wireless network gateway serves as the interface between the wireless network and external networks (e.g., the internet). It manages traffic, provides security features like NAT (Network Address Translation), and may include firewall capabilities.

66

Resposta de referência

TCP (Transmission Control Protocol) is connection-oriented, reliable, and ensures ordered data delivery, while UDP (User Datagram Protocol) is connectionless, faster, and does not guarantee delivery or ordering.

67

Resposta de referência

To configure an access point for optimal performance: - - Set appropriate channel and channel width. - Adjust transmit power to balance coverage and interference. - Implement band steering to distribute clients between 2.4 GHz and 5 GHz bands. - Regularly update firmware and monitor network performance.

68

Resposta de referência

DNS (Domain Name System) translates domain names into IP addresses, allowing users to access websites easily.

69

Resposta de referência

A hub operates at Layer 1 and broadcasts data to all ports, a switch operates at Layer 2 and forwards data based on MAC addresses, and a router operates at Layer 3 and routes packets based on IP addresses.

70

Resposta de referência

CISSP covers security management, including network security policies and risk assessment.

71

Resposta de referência

I follow change management, test in a staging environment, and schedule during maintenance windows.

72

Resposta de referência

The Nyquist theorem states that the maximum data rate for a noiseless channel is twice the bandwidth of the channel. It helps determine the minimum sampling rate required to avoid aliasing in digital communication systems.

73

Resposta de referência

Below are few advantages of using VPN: - VPN is used to connect offices in different geographical locations remotely and is cheaper when compared to WAN connections. - VPN is used for secure transactions and confidential data transfer between multiple offices located in different geographical locations. - VPN keeps an organization's information secured against any potential threats or intrusions by using virtualization. - VPN encrypts the internet traffic and disguises the online identity.

74

Resposta de referência

Network topology dictates what media you should use to interconnect devices and serves as a basis for selecting the materials, connectors, and terminations suitable for the configuration.

75

Resposta de referência

Public IPs are internet-facing; private IPs are for internal use.

76

Resposta de referência

SDN separates the network control plane from the data plane. This allows for more flexible and programmable network management. Benefits include centralized control, increased network agility, and easier implementation of network-wide policies.

77

Resposta de referência

G.711 is a codec that encodes audio at 64 kbps, offering high quality with low compression.

78

Resposta de referência

The candidate should confirm their leadership experience, including team size, scope of projects, and management style.

79

Resposta de referência

I recognise that staying up-to-date with the latest network engineering trends, products, and technologies is essential to my career, especially given the rapid pace of the IT industry. To achieve this, I actively engage in various online professional groups where we exchange ideas and explore new concepts. I also stay informed by subscribing to multiple podcasts and attending an annual IT conference. Additionally, I try to enrol on the latest courses and certifications and complete them in my own time to keep my knowledge of network engineering up-to-date.

80

Resposta de referência

Anonymous FTP is a way of granting user access to files on public servers. Users allowed access to data on these servers do not need to identify themselves but instead log in as anonymous guests.

81

Resposta de referência

It is the LAN card's 48-bit hardware address. The network adapter card typically keeps the MAC address in ROM, and it is distinct.

82

Resposta de referência

Advantages include cost savings and flexibility; challenges include network dependency and security risks.

83

Resposta de referência

Check PE router VRF → verify route in BGP VPNv4 table → confirm label binding in LFIB → check LDP/RSVP sessions → ping/traceroute with mpls ping/mpls traceroute.

84

Resposta de referência

A VPN (Virtual Private Network) creates an encrypted tunnel over a public network, ensuring secure remote access and data privacy.

85

Resposta de referência

ARP resolves IP addresses to MAC addresses.

86

Resposta de referência

Check NAT translations (show xlate) → ACL rules → default route → packet-tracer (ASA) or flow-debug → rollback if misconfiguration found.

87

Resposta de referência

Also known as Wi-Fi 4, 802.11n was introduced in 2009. It operates in both 2.4 GHz and 5 GHz frequency bands and uses multiple-input multiple-output (MIMO) technology to achieve a maximum data rate of up to 600 Mbps. It provides improved range and is backward compatible with 802.11a, 802.11b, and 802.11g devices.

88

Resposta de referência

I used packet captures to identify a misconfigured ACL, then updated rules and verified connectivity.

89

Resposta de referência

A Layer 2 switch forwards frames based on MAC addresses, while a Layer 3 switch can also route packets based on IP addresses, combining switching and routing functions.

90

Resposta de referência

Although I have a deep knowledge of network engineering, I would like to improve on my ability to present and translate complex ideas and processes to non-technical shareholders in a way that they will understand and benefit from.

91

Resposta de referência

A wireless repeater extends the coverage area of a Wi-Fi network by receiving and retransmitting signals.

92

Resposta de referência

- WPA2 uses AES: A newer Wi-Fi encryption solution that is more secure than the older TKIP used in WPA.

93

Resposta de referência

Proxy servers are used for securing a network from external users who might want to intrude into the network. It makes a computer system virtually invisible to others. A proxy server has a list of harmful websites so that the main network is protected. When it receives a request, it collects the data from the target web server and processes it. The response is then forwarded to the user.

94

Resposta de referência

- You can mix wireless equipments from different vendors, but the recommendation is that you should prefer only prescribed vendors, because most wireless networking hardware vendors support the 802.11 standard they can inter operate. However, we recommend verification as the standard is a fairly recent one, and does specify two different methods for wireless communications; Frequency Hopping (FH) and Direct Sequence Spread Spectrum (DSSS or DS), which are not interoperable. - When purchasing wireless networking hardware from separate vendors be sure to obtain guarantees from the vendors that the hardware will interoperate and follows the standards. - Within a short time we expect all new wireless cards, like ethernet cards, to become inexpensive, ubiquitous and totally interoperable. - Also of note is that the latest version of the standard defines 11mbps and 5.5mbps networking, with support for the older standard 1mbps and 2mbps speeds. This provides some compatibility with different or older equipment. Note that this new standard covers DS-type Networks, not FH types. - Software access points such as InterGate which uses the wireless interface of the host computer should have no compatibility issues with third party wireless hardware, as long as standards are followed. Typically wireless hardware is identified to the software as a network interface, and therefore can be used in the same way as any other network card. So you can choose them from different vendors but keeping these things in mind and then go ahead.

95

Resposta de referência

A VLAN, or Virtual Local Area Network, allows for logical segmentation of a network, improving security by isolating sensitive data. It also enhances performance by reducing broadcast traffic and managing network congestion more effectively.

96

Resposta de referência

NAT modifies IP information in packet headers to allow multiple devices to share a single public IP address. Types include PAT (many private IPs to one public IP).

97

Resposta de referência

Given that WiFi 6E operates in the 6GHz band, it's crucial to understand its spectrum allocation and usage. Spectrum analysis of the 6GHz band can help in finding out most suitable channels for deployment, identifying interference sources, and ensuring optimal performance in WiFi 6E networks. While I am still accumulating experience in this area, deploying WiFi 6E in the 6GHz band offers promising opportunities to gain extensive expertise.

98

Resposta de referência

In my previous role, I led the implementation of SD-WAN technology to enhance network performance and reliability. The main challenge was ensuring minimal disruption during the transition, which I managed by conducting thorough testing and phased deployment.

99

Resposta de referência

Network engineers must ensure that network performance is running optimally without issues despite bottlenecks and threats of decreased performance. Potential employers want to know that you have the skills to identify these common issues and can act quickly to reduce any downtime. This question gives you a chance to talk about your previous work optimizing router protocols and implementing delivery solutions to fix system bottlenecks.

100

Resposta de referência

The candidate should provide an example of using RFID for asset tracking, inventory management, or location services, detailing the implementation and outcomes.

101

Resposta de referência

As a Network Engineer, you'll often have to describe technical issues to people who aren't familiar with the terminology. When this occurs, use layman's terms. Drawing diagrams can be extremely helpful when describing a problem and possible solutions.

102

Resposta de referência

LTE Advanced Pro (also known as LTE-A Pro) is an enhancement of LTE that introduces new features like higher-order carrier aggregation, massive MIMO, and advanced modulation techniques. It provides faster data rates and better performance compared to standard LTE.

103

Resposta de referência

Security concerns at Wi-Fi hotspots include eavesdropping and man-in-the-middle attacks. Measures for data protection include using VPNs, ensuring HTTPS connections, and avoiding sensitive transactions on public networks.

104

Resposta de referência

WEP (Wired Equivalent Privacy) is an outdated wireless security protocol with weak encryption, easily cracked due to static keys and IV reuse.

105

Resposta de referência

The physical layer performs the transformation from data bits to electrical signals and vice versa. This is where network devices and cable types are considered and configured.

106

Resposta de referência

A backbone network is a centralized infrastructure created to provide several networks with varied routes and data. It also manages channel and bandwidth control.

107

Resposta de referência

Site-to-Site connects office to office; Remote Access connects user to office via secure tunnels.

108

Resposta de referência

Full Mesh Topology (Ad-hoc Network): Each node is directly connected to all other nodes.

109

Resposta de referência

VPN stands for Virtual private network. - It is considered VIRTUAL because it establishes a digital pathway, without needing a physical cable, between the user's device and the VPN server. - It is considered PRIVATE due to its ability to encrypt user data and conceal their Internet Protocol (IP) address. - It is considered a NETWORK due to its ability to connect various computing devices, namely the user's device and the VPN server. Virtual Private Networks simplify the transmission of all network traffic to a virtual network, thus allowing users to access local network resources remotely and bypass Internet censorship. The majority of operating systems have built-in VPN support. VPNs were initially designed to connect separate corporate networks over the internet securely or to provide remote access to a company's network.

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The basic components include: Transmitter: Converts information into a signal for transmission. Receiver: Decodes the transmitted signal back into information. Channel: The medium (air, space) through which the signal propagates. Antenna: Facilitates the transmission and reception of signals.

111

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IPv6 offers larger address space, better security, simplified header, and autoconfiguration.

112

Resposta de referência

Parameters Include: SSID, RF, Channel authentication method.

113

Resposta de referência

OFDM stands for Orthogonal Frequency Division Multiplexing, which is also a multiplexing technique used in analog systems. In OFDM, a guard band is not necessary, and the spectral efficiency of OFDM is high, which negates FDM. Additionally, an individual data source connects all the sub-channels in it.

114

Resposta de referência

I actively follow industry leaders on LinkedIn and subscribe to Wireless Week and IEEE Communications Magazine to stay informed about innovations and trends. Additionally, I attend the annual Mobile World Congress and participate in webinars hosted by the IEEE. Recently, I completed a certification course on 5G technologies, which I've already started applying in my projects. I also share key takeaways with my team to foster a culture of continuous learning.

115

Resposta de referência

DNS stands for Domain Name Server. It translates Internet domains and hostnames to IP addresses and vice versa. DNS technology allows typing names into your Web browsers and your computer to automatically find that address on the Internet. A key element of the DNS is a worldwide collection of DNS servers. It has the responsibility of assigning domain names and mapping those names to Internet resources by designating an authoritativename server for each domain. The Internet maintains two main namespaces like Domain Name hierarchy and Internet protocol address space.

116

Resposta de referência

In the OSI model, as a data packet moves from the lower to upper layers, headers get removed.

117

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Static routing involves manually configuring the routing table with fixed paths for data packets. It's simple and secure but requires manual updates when network changes occur. Dynamic routing uses algorithms and protocols like OSPF or EIGRP to automatically adjust paths based on network conditions. It adapts to changes more efficiently but may be more complex to manage.

118

Resposta de referência

Wi-Fi technology is a technology used for transmitting a signal using the 802.11 specifications works a lot like it does with a basic Ethernet hub: They're both two-way forms of communication, and they both use the same frequency to both transmit and receive, often referred to a half-duplex. WLANs used radio frequencies (RFs) that are radiated into the air from an antenna that creates radio waves. These waves can be absorbed, refracted, or reflected by walls, water, and metal surfaces, resulting in low signal strength. So because of this vulnerability to surrounding environmental factors, it's pretty apparent that wire-less will never offer us the same robustness as a wired network can, but that still doesn't mean we're not going to use or run the wireless or Wi-Fi.

119

Resposta de referência

A gateway is a network node that connects two different networks, often translating protocols and enabling communication between them.

120

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Benefits include resilience and scalability, while drawbacks involve complexity in management and security.

121

Resposta de referência

I actively follow publications like 'Wireless Week' and participate in online forums such as the IEEE Communications Society. I attend the annual Mobile World Congress to network and learn about emerging technologies. Recently, I completed a certification in 5G network design, which I applied to a current project to ensure our infrastructure is future-proof. Sharing insights with my team helps us innovate and stay competitive.

122

Resposta de referência

Network Address Translation (NAT) enables private IP networks that use unregistered IP addresses to connect to the public internet. NAT operates on a router, usually connecting two networks together, and translates the private (not globally unique) addresses in the internal network into a legal public IP address before packets are forwarded on the internet. It helps conserve the global IP address space.

123

Resposta de referência

An NMS centralizes monitoring, configuration, and performance management of network devices.

124

Resposta de referência

Association/Re-Association response frame contains AID. Association/Re-association request frame contains Listen Interval.

125

Resposta de referência

WLAN has physical layer frame formats that differ in 11a, 11b, 11g, 11n, and 11ac. They all have three generic fields: preamble, header, and data payload (PSDU). The preamble carries STF (short training field) and LTF (long training field) used for front-end synchronization. Front-end synchronization includes time offset estimation and correction, frequency offset estimation and correction, and channel estimation and equalization. The header carries two important parameters: rate and length. Rate specifies the modulation-code rate of the data payload part, and the length field specifies the length of the data payload in units of OFDM symbols.

126

Resposta de referência

When you enter a URL like www.example.com, the following steps occur one by one: - DNS Resolution – The browser queries a DNS server to translate the domain name into an IP address. - TCP Connection – A TCP three-way handshake is established with the server. - HTTP/HTTPS Request – The browser sends an HTTP or HTTPS request to the web server. - Server Response – The server sends back the requested webpage data. - Rendering – The browser renders HTML, CSS, and JavaScript to display the page. Follow-up Question: Which protocol allows users to access a website using a URL instead of an IP address? DNS (Domain Name System) converts human-readable domain names (like google.com) into IP addresses that computers use to communicate. So, we do not need to know and write ip address of any website. We preferred easily remembered domain addresses.

127

Resposta de referência

Implement firewalls, segmentation, encryption, access controls, and regular security audits.

128

Resposta de referência

Ad-Hoc networking is preferable over infrastructure mode in scenarios like temporary meetings, emergency communication setups, or direct file sharing between devices without an existing network infrastructure.

129

Resposta de referência

A local host can download files from a distant host using the trivial file transfer protocol (TFTP), but it lacks security and reliability. It uses UDP's basic packet delivery functions. The usual method offered by TCP/IP for copying a file from one host to another is the File Transfer Protocol (FTP). It is dependable and secure because it uses TCP's services. It creates two links (virtual circuits) between the hosts, one for informational control and the other for data transport.

130

Resposta de referência

Beacons are broadcasted at the mandatory data rates set on the 2.4 and 5GHz radios.

131

Resposta de referência

Use BGP path prepending/local-pref to shift routes gradually → verify MPLS/labels on new PE → move customers in phases → monitor for packet loss.

132

Resposta de referência

TCP ensures reliable data transmission by establishing a connection. It uses acknowledgements to confirm data delivery. In contrast, UDP is faster but less reliable. UDP does not establish a connection or guarantee delivery. TCP is used for applications requiring accuracy. This includes things like file transfers or emails. But, UDP is better for real-time applications. It is often used for streaming or online gaming.

133

Resposta de referência

During a large-scale network upgrade, unforeseen compatibility issues delayed the project and affected performance. I conducted a thorough post-mortem analysis, which highlighted the need for more rigorous pre-deployment testing. This experience taught me the importance of contingency planning and stakeholder communication.

134

Resposta de referência

Use QoS, adaptive bitrate streaming, CDNs, and sufficient bandwidth to ensure smooth playback.

135

Resposta de referência

FlexConnect: Enables branch office APs to be managed from a central location, allowing local client data switching and authentication. FlexConnect (previously known as Hybrid Remote Edge Access Point or H-REAP) is a wireless solution for branch office and remote office deployments. It enables you to configure and control access points in a branch or remote office from the corporate office through a wide area network (WAN) link without the deployment of a controller in each office. The FlexConnect access points (APs) can switch client data traffic locally and perform client authentication locally. When they are connected to the controller, they can also send traffic back to the controller.

136

Resposta de referência

Communication skills are vital for network engineers who often need to explain technical issues to non-technical stakeholders. Candidates should demonstrate the ability to simplify complex concepts without losing essential details.

137

Resposta de referência

You should first check these things: - Bandwidth utilization - Broadcast storms - Duplex mismatch - High CPU usage on network devices - Excessive downloads or streaming - Malware or abnormal traffic You can use tools such as: - Wireshark - SNMP monitoring - NetFlow - Interface statistics on switches/routers You should also check: " show interfaces show processes cpu"

138

Resposta de referência

This question reveals problem-solving skills and technical expertise. Candidates should describe a specific issue, the steps taken to resolve it, and the outcome. Look for a structured approach and successful resolution.

139

Resposta de referência

Stateful uses DHCPv6 for addresses, while stateless (SLAAC) uses router advertisements for automatic configuration.

140

Resposta de referência

In networking, Quality of Service (QoS) refers to the performance level of a service or network. QoS mechanisms control the bandwidth, delay, jitter, and packet loss rate in a network by prioritizing certain types of traffic. For instance, voice and video traffic may be prioritized over other types of traffic to ensure smooth communication.

141

Resposta de referência

A hub broadcasts to all ports, while a switch forwards based on MAC addresses, reducing collisions.

142

Resposta de referência

DNS is known as the phonebook that helps in translating the domain into a computer-readable IP address. DNS allows users to access websites without having to memorize long strings of numbers. For example, instead of typing 104.26.10.228, you can type pynetlabs.com, and DNS will find your corresponding IP address.

143

Resposta de referência

SNMP (Simple Network Management Protocol) monitors and manages network devices by collecting metrics and sending alerts.

144

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Benefits include resource efficiency, rapid provisioning, and multi-tenant isolation.

145

Resposta de referência

Network+ validates vendor-neutral networking skills, covering troubleshooting and configuration.

146

Resposta de referência

There are various messages exchanged between a Station (STA) and an Access Point (AP) in a WLAN network for various purposes, such as establishing a connection, data transfer, terminating the connection, and more. Access points are devices that help extend wired networks with wireless capabilities. The main WLAN MAC messages are listed below with their main functions. - Association request: This is sent by STA to AP to obtain association after authentication is done. - Association response: This message is sent by AP in response to the received association request. - Probe request: It is used to find out AP in the WLAN network. - Probe response: It contains station (STA) parameters as well as data rates. - Beacon: It is used by AP to announce the start of a CF (Contention Free) period. - Disassociation: Used to announce the break-up of an existing association between peers in a WLAN network. - Authentication: These packets are used by STA to request authentication. - De-Authentication: Used by an authenticated station to announce that the receiver no longer needs to be authenticated. - RTS/CTS: Used for the initial handshake between WLAN peers. - ACK: Indicates the receipt of transmitted data whether reached on the other side or not. - CF end: It indicates the end of CFP (contention-free period).

147

Resposta de referência

802.11n rates: http://mcsindex.com/ 802.11ac MCS rates

148

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Example: A routing loop caused outages; I used traceroute and STP analysis to identify and disable redundant links.

149

Resposta de referência

Tunnels create a virtual passage for data exchange between two communicating computers without using IPsec themselves. The gateway connecting their LANs to the transit network creates a virtual tunnel and uses the IPsec protocol to secure all communication passing through it.

150

Resposta de referência

Network security is multi-faceted, requiring both perimeter and in-depth strategies. I implement firewalls to block unauthorized access and use Intrusion Detection Systems (IDS) and Intrusion Prevention Systems (IPS) for real-time threat detection and mitigation. Beyond hardware solutions, I believe in maintaining a strong security posture through regular patching, security audits, and end-user education. For monitoring, tools like Wireshark and SolarWinds provide invaluable insights into network traffic, enabling early detection of anomalies.

151

Resposta de referência

BSOD stands for "Blue Screen of Death." A blue screen with a code appears when a hardware or OS issue prevents the Windows operating system from functioning. The best solution is to boot from the "Last Known Good Configuration" on the PC. Boot the machine in safe mode. And if that doesn't work, it could signify issues with the devices or driver.

152

Resposta de referência

- Full Mesh Topology (Ad-hoc Network): Each node is directly connected to all other nodes.

153

Resposta de referência

Quality of Service (QoS) is a networking feature that gives important network traffic higher priority than less important traffic. In simple words, it controls which data should move first in the network when the network gets busy. A network carries many types of data: - Video calls - Voice calls - YouTube Videos - File Downloads - Emails - Online games, etc. But not all traffic is equally important. Without QoS, all the traffic is treated the same way, which can cause: - Voice breaking - Video buffering - Slow application performance - Lag during meetings, etc. QoS solves these problems by giving priority to important traffic.

154

Resposta de referência

Piggybacking is used to improve the efficiency of the bidirectional protocols. When a frame is carrying data from A to B, it can also carry control information about arrived (or lost) frames from B; when a frame is carrying data from B to A, it can also carry control information about the arrived (or lost) frames from A.

155

Resposta de referência

WiFi 6E essentially means 'Extended,' and represents WiFi 6's extension into the 6 GHz band. This higher frequency band, previously reserved for other forms of communication, like satellite and telecom, offers additional channels and lesser noise. Consequently, WiFi 6E enjoys all the benefits of WiFi 6 and additional, less congested bandwidth to provide faster speeds and lower latency. This is particularly advantageous for high-performance uses such as gaming and HD video streaming.

156

Resposta de referência

SNR is the ratio of the signal power to the noise power. A higher SNR indicates a clearer, stronger signal. It is important because it determines the quality of the communication link and directly affects data transmission rates and error rates.

157

Resposta de referência

USB stands for Universal serial bus, which connects devices like modems, mouses, and keyboards.

158

Resposta de referência

- Interfering Devices: Microwave ovens, cordless phones.

159

Resposta de referência

I have experience with network automation and scripting using tools like Ansible, Python, and PowerShell. This includes automating routine tasks such as device configuration, software updates, and network monitoring. Automation improves efficiency, reduces errors, and allows for more consistent network management. I also develop custom scripts to address specific network needs and streamline operations.

160

Resposta de referência

Anycast address is a single IP address utilized by a set of servers at different sites. When one directs any request to an Anycast address, the address is redirected to the nearest server. This will improve the speed and consistency of network services since the distance the information needs to travel is reduced. It is also able to help manage heavy traffic at the same time. How it works: - The same IP address is used for many servers. - The network finds the closest server to you. - Your request is sent to that server automatically. - If one server fails, traffic is redirected to the next closest server.

161

Resposta de referência

I have experience with network analytics and reporting using tools like SolarWinds, PRTG, and Splunk. These tools provide insights into network performance, traffic patterns, and security events. I generate regular reports to monitor key metrics, identify trends, and make data-driven decisions to optimize network operations and improve performance.

162

Resposta de referência

SDN provides centralized control for virtualized networks, enabling dynamic policy management.

163

Resposta de referência

WAN is a Wide Area Network. It connects computers across different places or countries.

164

Resposta de referência

There are nine for a specific Spacial stream. http://wirelessonthego.postach.io/post/802-11ac-mcs-rates

165

Resposta de referência

A VLAN logically segments a network into isolated groups, improving security and reducing broadcast traffic.

166

Resposta de referência

Wi-Fi 6/6E's advantages like higher data rates, improved capacity, lower latency, and advanced power management features make it favorable for IoT applications. IoT devices often require reliable connectivity, and WiFi 6/6E's ability to accommodate many devices simultaneously can optimize the performance of the entire IoT network. Furthermore, features such as Target Wake Time (TWT) can significantly improve the battery life of IoT devices.

167

Resposta de referência

Piggybacking: Unauthorized use of someone else's wireless connection without their permission.

168

Resposta de referência

Check show processes cpu to identify the culprit → verify control plane vs data plane issue → check routing protocol flaps, BGP churn, or ACL processing → if DoS attack suspected, use CoPP (Control Plane Policing).

169

Resposta de referência

NIC stands for network interface controller — a piece of computer hardware also known as a network card or network adapter. An NIC enables computer communication over a computer network.

170

Resposta de referência

I use tools like Nmap or Telnet to scan and verify open ports on a network. These tools help identify which ports are accessible and monitor potential vulnerabilities. Regular port checks are a key part of maintaining network security and performance.

171

Resposta de referência

- Fully Qualified Domain Name A fully qualified domain name (FQDN) ends with a null or empty string (FQDN). - Partially Qualified Domain Name A partially qualified domain name does not end with a null string (PQDN). A PQDN does not finish at the root; rather, it begins at a node.

172

Resposta de referência

ICMP (Internet Control Message Protocol) is used for error reporting and diagnostic functions, such as ping and traceroute, in IP networks.

173

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First, check whether the server is reachable on the local network. You can use commands like "ping" or "traceroute" to check this. If the user can access the Internet but not the internal server, the issue must be related to: - Incorrect VLAN configuration - Firewall rules are blocking access - DNS resolution issue - Server down or disconnected - Incorrect gateway settings You should also verify: - IP configuration of the client - Server status - Switch port VLAN assignment - ACLs or firewall policies

174

Resposta de referência

Ultra-Wideband (UWB) contrasts with Wi-Fi by offering very high bandwidth over short distances, making it suitable for applications like precise location tracking and high-speed data transfer in close proximity, while Wi-Fi provides broader coverage and is used for general wireless networking over longer ranges.

175

Resposta de referência

I approach network capacity planning by analyzing current network usage and performance metrics, projecting future growth, and identifying potential bottlenecks. This involves monitoring traffic patterns, evaluating bandwidth requirements, and assessing the scalability of existing infrastructure. Based on the analysis, I develop a plan that includes upgrading hardware, optimizing configurations, and implementing additional resources to ensure the network can handle future demands.

176

Resposta de referência

Challenges include visibility gaps, hypervisor vulnerabilities, and east-west traffic security.

177

Resposta de referência

Interestingly, most infrastructure and development teams don't get along well with each other. When development teams and infrastructure teams get together to design large systems, they usually disagree with each other. There can be a lot of tension between the two departments. When you answer this question, make sure you give an answer that attempts to help a development team and facilitates progress instead of stifles it. You want to help developers complete projects while securing the network in the best way possible.

178

Resposta de referência

Network topology is a physical layout of the network, connecting the different nodes using the links. It depicts the connectivity between the computers, devices, cables, etc.

179

Resposta de referência

VLANs (Virtual Local Area Networks) segment networks to improve performance and security. They achieve this without the need for new hardware. They allow logical grouping of devices regardless of physical location.

180

Resposta de referência

Several vendors offer WiFi 6/6E hardware, including popular names like Cisco, Netgear, Asus, and TP-Link. Through past projects, I had opportunities to work with different vendors, each providing a unique experience. For instance, Asus and Netgear have user-friendly interfaces that make the setup process effortless, whereas Cisco provides more robust and enterprise-level features that suit large organizations.

181

Resposta de referência

A wireless repeater receives and retransmits wireless signals to extend coverage in areas with weak signal strength. It is used to enhance signal coverage in large or obstructed areas, improving connectivity for devices at the network's edge.

182

Resposta de referência

I implement layered security measures including firewalls, intrusion detection systems, and regular vulnerability assessments. I also enforce strict access controls and continuously monitor network traffic for anomalies. By staying current with security patches and industry trends, I maintain a robust defense against cyber threats.

183

Resposta de referência

Cloud-based networking allows organizations to use virtual networks with a third-party provider to handle network computing rather than operating an expensive in-house network. This is a good chance to discuss your skills with different cloud network environments, including certifications you may have earned that demonstrate your proficiency with these cloud platforms. Some of these certifications include: AWS Certified Cloud Practitioner, Microsoft Certified: Azure Fundamentals, Google Cloud Certification.

184

Resposta de referência

A router routes data between networks.

185

Resposta de referência

- Models Include: Aironet 1530, 1540, 1560, 1570, 1552, and Industrial Wireless 3702. Below are some of the latest Cisco Outdoor Rugged Access Points - Aironet 1530 Series Aironet 1540 Series Aironet 1560 Series Aironet 1570 Series Aironet 1552 Access Point Industrial Wireless 3702

186

Resposta de referência

Preferred tools for WarDriving are as follows:- a) Kismet- Kismet is a 802.11b wireless network sniffer. It is capable of sniffing using almost any wireless card supported in Linux. b) Airsnort- is one of the first tools to come out discovering insecurity of wireless network. AirSnort is a wireless LAN (WLAN) tool which cracks encryption keys on 802.11b WEP networks. AirSnort operates by passively monitoring transmissions, computing the encryption key when enough packets have been gathered. c) WEPCrack is Perl based tool. WEPCrack is a tool that cracks 802.11 WEP encryption keys using the latest discovered weakness of RC4 key scheduling. d) WaveStumbler is console based 802.11 network mapper for Linux. It reports the basic AP stuff like channel, WEP, ESSID, MAC etc. e) Aircrack yet another WEP cracking tool for Linux courtesy by divine.

187

Resposta de referência

I would implement a modular design with core, distribution, and access layers. This includes using redundant links and devices, implementing load balancing, choosing scalable technologies like VLANs and IP subnets, and ensuring the network can accommodate future growth in users, devices, and applications.

188

Resposta de referência

A proxy server acts as an intermediary/middlemam between a client and a server. I So what happens is that direct communication doesn't take place, and a request is passed through the proxy, which is then forwarded to the destination intended. Now, proxy works differently depending on where it is placed. And this can be understood through forward and revers proxies. I'll first explain this to you with a simple idea. Normally, a request goes from a client to server. But when a proxy is introduced, the client first nudges the proxy and then it reaches the server. In Forward Proxy, the proxy sits in front of the client. So the request flow goes from client to the forward proxy and then the internet. And because of this, the server doesn't really see the client's IP address instead it only confronts the proxy. So, wherever websites are needed to be controlled, like in the corporate setting, the forward proxy is used. It can also be used for caching or hiding user identity. Now talking about Reverse Proxy Consider the opposite case. Here, the proxy sits in front of the server and because of that the flow goes from client to the revers proxy and then the server. From the client's point of view, it looks like they are communicating with a single server, but internally, the proxy may be routing the request to multiple backend servers. This setup is usually used for load balancing, SSL handling, and protecting servers from direct exposure. In the most basic sense, what you should remember is that forward proxy is used on the client's side to hide client's identity and a revers proxy is used on the server side which hides the server's identity. Some examples that you can use are: - Forward proxies are often used in corporate firewalls. - Reverse proxies are commonly used with tools like Nginx or services like Cloudflare.

189

Resposta de referência

COBIT® is a framework for developing, implementing, and monitoring information technology and management practices. It is a framework by ISACA (Information System Audit and Control Association) designed for all IT governance to bridge the gap between technical issues, business risk, and control requirements.

190

Resposta de referência

191

Resposta de referência

A node is a point where two or more devices connect within a network. A node is where data is received, stored, sent and created within the network. Nodes can be an endpoint for transmitting data or a redistribution point. Any device connected to another device inside a network is a node itself. Common examples of nodes are switches, routers, bridges, and servers, which may be connected or other devices through the internet.

192

Resposta de referência

LANs are widely used to connect computers/laptops and consumer electronics which enables them to share resources (e.g., printers, fax machines) and exchange information. When LANs are used by companies or organizations, they are called enterprise networks. There are two different types of LAN networks i.e. wireless LAN (no wires involved achieved using Wi-Fi) and wired LAN (achieved using LAN cable). Wireless LANs are very popular these days for places where installing wire is difficult. The below diagrams explain both wireless and wired LAN.

193

Resposta de referência

A host or router can utilize the address resolution protocol (ARP), which determines the physical address of another host on its network by sending an ARP query packet with the recipient's IP address. When a host just knows its physical address, the reverse address resolution protocol (RARP) enables it to find its Internet address.

194

Resposta de referência

FTP transfers files without encryption, while SFTP uses SSH for secure file transfer.

195

Resposta de referência

Based on my level of experience as a network engineer and research I have conducted around the position you're offering, I would be grateful for you to offer me 'X' for this position.

196

Resposta de referência

SNR (Signal-to-Noise Ratio) measures the strength of the wireless signal relative to background noise. To fix SNR issues, techniques include reducing interference, adjusting antenna placement, or increasing signal power.

197

Resposta de referência

CEH teaches ethical hacking techniques to identify and mitigate network vulnerabilities.

198

Resposta de referência

- Master Controller Mode: Designates a controller as the tie-breaker when multiple controllers are available.

199

Resposta de referência

A PBX (Private Branch Exchange) manages internal call routing and connects to external phone networks.

200

Resposta de referência

UWB vs Wi-Fi: UWB is short-range and high-bandwidth, ideal for personal area networks; Wi-Fi is longer-range and suitable for local area networks.

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