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1
참고 답변
I planned a VLAN migration, tested in a lab, and executed during off-hours with minimal downtime.
2
참고 답변
I maintain detailed diagrams, version-controlled configs, and change logs for audit and reference.
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3
참고 답변
A DHCP (Dynamic Host Configuration Protocol) server assigns IP addresses and other network configuration parameters to wireless devices automatically. It simplifies network management and ensures devices receive valid IP addresses for connectivity.
4
참고 답변
A load balancer distributes traffic across multiple servers, preventing overload and improving response times.
5
참고 답변
I handle conflicts by actively listening to all team members' perspectives and facilitating open, respectful communication. By seeking collaborative solutions, I ensure that the project benefits from diverse viewpoints and maintains productivity.
6
참고 답변
I explained a network outage's impact in business terms, focusing on downtime costs and resolution timeline.
7
참고 답변
The OSI protocol stack is the generic stack developed to make it easy for different manufacturers' devices to inter-operate without any interfacing issues. The TCP/IP stack is specifically designed for internet applications.
8
참고 답변
The difference between 11a, 11b, 11g, and 11n lies in terms of data rate, frequency of operation, distance coverage, and more.
9
참고 답변
Understanding network protocols is fundamental for network engineers. Candidates should list protocols like TCP/IP, BGP, OSPF, and MPLS, and explain their applications. Look for depth of knowledge and the ability to apply protocols to real-world scenarios.
10
참고 답변
CSMA/ CD stands for Carrier-sense multiple access Collision Detection. This protocol defines the way two devices interact when a data collision occurs. The protocol has rules of how long the devices in a network must wait when a collision happens. It analyses if the communication channel is busy or not, and controls the transmission accordingly. If it detects a collision, the transmission of the station is stopped. It then sends a jam signal and waits for some time before transmitting again.
11
참고 답변
When a network outage occurs, I immediately initiate a predefined incident response plan that includes diagnosing the issue, switching to backup systems, and communicating with affected users. I conduct a root cause analysis afterward to implement corrective measures. This structured approach minimizes downtime and helps prevent future occurrences.
12
참고 답변
Troubleshooting is a critical skill for network engineers. Candidates should explain their systematic approach to identifying and resolving network issues. A strong answer will include examples of tools and methodologies used, such as packet analyzers or diagnostic software, and a focus on minimizing downtime.
13
참고 답변
This usually happens because of a DNS issue. In this scenario, network connectivity is working because IP communication succeeds, but name resolution is failing. You should check the configured DNS Server, using: "nslookup google.com" - Verify internet DNS reachability - If the issue doesn't get resolved, you can change the DNS to public DNS for some time, using 8.8.8.8 and 1.1.1.1
14
참고 답변
I handle incidents and disaster recovery by having a well-documented and tested incident response plan and disaster recovery plan. This includes identifying critical network components, establishing backup and failover mechanisms, and defining roles and responsibilities. Regular drills and updates to the plans ensure readiness and minimize downtime during incidents.
15
참고 답변
The candidate should confirm their familiarity with Cisco network management tools, wireless LAN controllers, and related hardware/software.
16
참고 답변
QoS is traffic priority management.
17
참고 답변
The default gateway is the router that forwards traffic from a local network to external networks, enabling internet access.
18
참고 답변
I designed redundant paths, backup configurations, and tested failover procedures to ensure business continuity.
19
참고 답변
Microwave, 2.4 GHz video camera, 2.4GHz cordless phones, bluetooth devices etc
20
참고 답변
A bridge connects two network segments, forwarding frames based on MAC addresses.
21
참고 답변
An IPsec works on layer 3 of the OSI model.
22
참고 답변
I think about it in terms of scope and use case. OSPF is an open standard protocol that works great within a single organization or campus network. It converges relatively quickly and scales well for internal routing. I've used it in environments with multiple locations connected via WAN links. EIGRP is Cisco-proprietary, and if we're in a Cisco-only environment, I prefer it because it converges faster than OSPF and is simpler to configure with features like automatic summarization. BGP is what we use when connecting to external networks or other organizations. It's designed for the internet and gives us granular control over how traffic flows, which we need when dealing with multiple external connections. At my last job, we used OSPF internally and BGP to connect to our ISP—that combination gave us the efficiency we needed internally and the control we needed externally.
23
참고 답변
There are many benefits to using a Network Monitoring System (NMS). It allows for proactive detection of possible troubles before they affect users by offering centralized monitoring of all network devices and performance measures. Capacity planning is made simpler by NMS, which monitors growth patterns and bandwidth usage. It makes thorough performance analysis possible in order to locate bottlenecks and that further effectiveness. NMS offers detailed logs and diagnostic data to help with faultfinding. Greater responsiveness and reduced maintenance are made possible by automated reporting for important events. Network visibility, dependability, and management effectiveness are ultimately enhanced by NMS.
24
참고 답변
- 802.11ac Enhancements: Includes Multi-User MIMO, wider RF channels, and more spatial streams for faster and more efficient network performance. There are 2 variants of 802.11ac — phase 1 and phase 2. 802.11ac is faster compared to previous standards because of the introduction of the below - Multi-User MIMO (MU-MIMO) — Clients get on and off the network quicker, allowing more clients to be served, Pre Wave 2 an access point would talk to the clients one at a time and this was called SU-MIMO. Multi-user MIMO is important because it allows access points and their many antennas to transmit (or talk) to multiple client devices all at the same time. This helps maximize air-time efficiency so that each client, regardless of what version of 802.11 it is running, gets the amount of airtime it's supposed to get based on the technology supported. - Wider RF Channels — Wave 2 improvement is the option to use 160-MHz channel widths. That's double what we saw with Wave 1 technology. Think of this as a 2 line interstate road where two additional lines have been added. The top speeds depend on the whether the AP supports 80-MHz or 160-MHz channels, as well as whether the wireless client devices tapping your network support Wave 2. - Four Spatial Streams — Wave 2 also supports four transmitting and receiving antennas while the previous iteration supported only three receive antennas. Just like we see in the image below, With 4 spatial streams an AP could send 4 streams of data to the same client at the same time. The client can then aggregate this 4 streams and thus improve its throughput. It is also important to notice that on the AP side, the greater the number of receive antennas, the greater the distance that a particular data rate can be sustained. for more content visit our website- https://techclick.in
25
참고 답변
Access lists are simple packet filters based on IP addresses or ports, while firewall rules are more advanced, including stateful inspection and application-level filtering.
26
참고 답변
NAT (Network Address Translation) is a technique used to modify IP addresses in packets as they pass through a router or firewall. It allows multiple devices on a private network to share a single public IP address for accessing external networks. NAT helps conserve public IP addresses and enhances security by hiding internal IP addresses from external networks.
27
참고 답변
STP (Spanning Tree Protocol) is a network protocol used to prevent loops in Ethernet networks with redundant links. It works by creating a spanning tree topology that disables redundant paths and ensures a loop-free network. STP dynamically detects and blocks redundant links while maintaining backup paths in case of link failures. This improves network reliability and prevents broadcast storms.
28
참고 답변
The candidate should describe a methodical process, including spectrum analysis, checking for interference sources, verifying antenna alignment, and using RF mapping tools.
29
참고 답변
The 2.4 GHz frequency offers a broader range and better penetration through obstacles but is more susceptible to interference. The 5 GHz frequency provides higher data rates and reduced interference, making it ideal for high-bandwidth activities, but has a shorter range.
30
참고 답변
Network congestion occurs when the demand for bandwidth exceeds the available capacity. Several factors can contribute. Excessive traffic from users or applications can overwhelm network links. Insufficient bandwidth on critical links creates bottlenecks. Faulty network devices, like malfunctioning switches or routers, can cause performance degradation. Misconfigured Quality of Service (QoS) can lead to unfair bandwidth allocation. Broadcast storms, where excessive broadcast traffic floods the network, can cripple performance. Finally, application bottlenecks, where a server or application can't keep up with requests, can also manifest as network congestion.
31
참고 답변
Need of POP3: The Post Office Protocol (POP3) is the most widely used protocol and is supported by most email clients. It provides a convenient and standard way for users to access mailboxes and download messages. An important advantage of this is that the mail messages get delivered to the client's PC and they can be read with or without accessing the web.
32
참고 답변
Methods and best practices for securing a Wi-Fi network include using strong encryption (like WPA2 or WPA3), changing default passwords, disabling SSID broadcast, enabling MAC address filtering, and regularly updating firmware.
33
참고 답변
- Parameters Include: SSID, RF, Channel authentication method.
34
참고 답변
Basic Service Set (BSS) Color Coding is a mechanism introduced in WiFi 6/6E to better manage interference. By assigning different "colors" (or BSS codes) to different networks, client devices can identify whether a packet is from the same network (or "color"). This way, networks can better manage and mitigate interference, enhancing overall performance.
35
참고 답변
HSRP (Hot Standby Router Protocol) and VRRP (Virtual Router Redundancy Protocol) provide high availability by allowing multiple routers to act as a single virtual router, ensuring gateway redundancy.
36
참고 답변
IPv4 (Internet Protocol version 4) uses 32-bit addresses giving about 4.3 x 10^9 unique addresses. This address space is running out quickly because the Internet has exploded. Internet Protocol version 6 (IPv6) employs 128 bit addresses, allowing an astronomically larger address space (effectively limitless) to support the explosive growth of internet connected devices. Next to the address space, IPv6 provides enhancements like a reduced header format for faster processing, autoconfiguration (simplified device initial setup), and more optimization for mobile environments. To support mixed environments where both protocols are in use, an IPv6 to IPv4 converter is often required to enable communication and address translation between IPv6 and legacy IPv4 networks.
37
참고 답변
I have extensive experience configuring and managing firewalls and IDS/IPS systems, including Cisco ASA and Snort. In my previous role, I implemented advanced security policies that significantly reduced unauthorized access attempts and mitigated potential threats in real-time.
38
참고 답변
SDN separates the network control plane from the data plane. This allows for more flexible and programmable network management. Benefits include centralized control and increased network agility. It also enables more straightforward implementation of network-wide policies.
39
참고 답변
A managed switch provides advanced features like VLANs, QoS, and network monitoring, allowing for greater control and configuration. An unmanaged switch offers basic connectivity without configuration options, suitable for simpler network setups.
40
참고 답변
Use the formula 2^n, where n is the number of borrowed bits from the host portion of the subnet mask.
41
참고 답변
Pretty much the same answer as question 1.
42
참고 답변
Tools like NetFlow, sFlow, and network performance dashboards are used for monitoring.
43
참고 답변
Path selection is influenced by factors such as the longest prefix match, minimum administrative distance, and lowest metric value. These criteria help determine the most efficient route for data transmission. I've utilized these principles in configuring dynamic routing protocols effectively.
44
참고 답변
I take a multi-layered approach to network security, including: - Implementing firewalls and intrusion detection/prevention systems - Segmenting networks using VLANs and access control lists - Encrypting sensitive data in transit and at rest - Regularly updating and patching systems - Conducting security audits and vulnerability assessments - Implementing strong authentication mechanisms - Educating users about security best practices
45
참고 답변
Cloud computing delivers on-demand resources over the internet, requiring robust, scalable network connectivity.
46
참고 답변
Our CFO wanted to understand why we needed to spend $50,000 on a network upgrade. He didn't care about technical specs, so I used an analogy. I told him the current network was like a two-lane highway during rush hour—it works fine until demand spikes, and then everything backs up. The upgrade would be adding lanes and better traffic management. I showed him metrics: during peak hours, our link utilization was hitting 95%, which was causing slowdowns for financial reporting applications. I explained that these slowdowns were costing the company money because people were waiting. Then I showed him that the new equipment would cost $50,000 but would support our growth for the next three years without performance degradation. That business language—cost, impact, and timeline—resonated with him. He approved the budget. The lesson I learned is that technical people want to talk about throughput and latency, but business people want to know about impact and cost. Now I always translate technical issues into business terms.
47
참고 답변
A VLAN logically segments a physical network into isolated broadcast domains, improving security and reducing broadcast traffic.
48
참고 답변
I approach training and mentoring junior network engineers by providing hands-on training, sharing best practices, and offering guidance on troubleshooting and problem-solving. I encourage continuous learning through courses, certifications, and industry resources. Regular feedback and performance reviews help identify areas for improvement and support their professional growth.
49
참고 답변
Network virtualization abstracts physical resources into logical networks, enabling isolation and flexibility.
50
참고 답변
Virtual local area network, also known as VLAN divides a large network into smaller independent sections. A device in one VLAN communicates with another device in the same VLAN, as though it is in its own bubble, despite existing in the same physical system. This makes things neat and safe. When a problem, such as a virus, occurs in one VLAN, it remains there and does not propagate. It also decreases network congestion; data travels at a higher rate. VLANs simplify management of networks without additional hardware or cables requirements. They are an intelligent means of managing devices, improving security and keeping things going effortlessly.
51
참고 답변
The candidate should identify a genuine weakness and describe specific steps they are taking to improve, such as training or mentorship.
52
참고 답변
Here are some differences between synchronous and asynchronous transmission – | Synchronous transmission | Asynchronous transmission | | Data is sent in blocks or frames | Data is sent in bytes or characters | | Requires synchronization between sender and receiver | Does not require synchronization between the sender and receiver | | Fast and efficient for large amounts of data | Slow and economical for small amounts of data | | Uses timing signals to coordinate data transfer | Uses start and stop bits to indicate data boundaries | | Examples: Telephonic conversations, video conferencing, online gaming | Examples: Email, file transfer, online forms |
53
참고 답변
A patch panel organizes and terminates cables, simplifying connections and maintenance.
54
참고 답변
Bandwidth is characterized as the measure of data or information that can be transmitted in a fixed measure of time. The term can be used in two different contexts with two distinctive estimating values. In the case of digital devices, the bandwidth is measured in bits per second(bps) or bytes per second. In the case of analog devices, the bandwidth is measured in cycles per second, or Hertz (Hz). Bandwidth is only one component of what an individual sees as the speed of a network. True internet speed is actually the amount of data you receive every second and that has a lot to do with latency too.
55
참고 답변
VPN stands for the virtual private network. A virtual private network (VPN) is a technology that creates a safe and encrypted connection over a less secure network, such as the Internet. A Virtual Private Network is a way to extend a private network using a public network such as the Internet. The name only suggests that it is a Virtual “private network” i.e. user can be part of a local network sitting at a remote location. It makes use of tunneling protocols to establish a secure connection.
56
참고 답변
I use performance monitoring tools like SolarWinds and Wireshark to track bandwidth usage, latency, and packet loss. Regular analysis of these metrics helps me identify bottlenecks and plan for capacity upgrades. This proactive monitoring is essential for maintaining a high-performance network environment.
57
참고 답변
RIP, or Routing Information Protocol, is used by routers to send data from one network to another. It effectively manages routing data by broadcasting its routing table to all other routers within the network.
58
참고 답변
Network segmentation is crucial for enhancing security by isolating sensitive data and reducing the attack surface. I implement segmentation using VLANs and access control lists, ensuring efficient traffic management and improved network performance.
59
참고 답변
I have experience using Python for network automation tasks such as configuration management, data collection, and report generation. I've also worked with tools like Ansible for orchestrating network changes across multiple devices.
60
참고 답변
There are different distances and data rates available in WLAN devices based on the IEEE standard they are supporting.
61
참고 답변
Cloud technologies are increasingly important. Candidates should discuss their experience with cloud platforms like AWS, Azure, or Google Cloud, and how they integrate cloud solutions with existing networks.
62
참고 답변
Here are some benefits of SD-WAN: - It simplifies WAN Management. - It reduces WAN costs. - Provides more security. - Increased Bandwidth and efficiency. - It provides easier network management. Learn the benefits of SD-WAN in detail.
63
참고 답변
Beacon, Probe Response, Assoc Req, Re-association Req, 11r Re-association response
64
참고 답변
The IP address 127.0.0.1 is a reserved address that is used for localhost connections. It is a special IPv4 address that is also called a loopback address. It is not a real IP address but all systems have this address which means “this computer”. During any connection issues, the server is pinged to check whether it is responding with the help of this address. The address is only used by the computer you are currently working on.
65
참고 답변
The router is a networking device used for connecting two or more network segments. It directs the traffic in the network. It transfers information and data like web pages, emails, images, videos, etc. from source to destination in the form of packets. It operates at the network layer. The gateways are also used to route and regulate the network traffic but, they can also send data between two dissimilar networks while a router can only send data to similar networks.
66
참고 답변
Defending against Distributed Denial of Service (DDoS) attacks requires a multi-layered approach. Rate limiting restricts the number of requests from a specific source. Traffic filtering, using ACLs and BGP flowspec, blocks malicious traffic patterns. Intrusion Detection/Prevention Systems (IDS/IPS) identify and block attack signatures. DDoS mitigation services, either cloud-based or on-premise, can absorb large volumes of attack traffic. Over-provisioning bandwidth provides additional capacity. Using a Content Delivery Network (CDN) distributes traffic, making it harder to overwhelm the origin server.
67
참고 답변
A MAC (Media Access Control) address is a unique identifier assigned to network interfaces for communication on a physical network. In wireless networks, it is used to identify devices and manage communication between them.
68
참고 답변
While this one may seem obvious, how you answer is important because it can demonstrate how you'd explain it to someone unfamiliar with tech terminology. One way to describe a network is multiple computers connected via an optical fiber (or another type of cable) to share hardware, software, and data. These devices communicate with one another to make this possible.
69
참고 답변
- Mechanisms Include: WEP, WPA, WPA2, EAP, MAC authentication.
70
참고 답변
A network is a collection of devices that communicate to share resources and information. It enables connectivity between nodes and devices within various geographic scopes, including different network types such as PAN, LAN, MAN, and WAN.
71
참고 답변
Some services provided by the application layer in the Internet model are as follows: - Mail services - Directory services - File transfer - Access management - Network virtual terminal
72
참고 답변
Carrier aggregation is a technique in LTE that combines multiple frequency bands to increase the total available bandwidth and thus improve data rates. It enhances user experience by providing faster downloads and more capacity for data services.
73
참고 답변
I have experience with SDN (Software-Defined Networking) technologies such as OpenFlow, Cisco ACI, and VMware NSX. SDN separates the control plane from the data plane, allowing for centralized management and dynamic configuration of network resources. This enhances network agility, simplifies management, and improves scalability and automation.
74
참고 답변
I actively participate in industry conferences, subscribe to leading IT publications, and take relevant certification courses. Engaging with professional communities and online forums also helps me stay informed about the latest advancements. This continuous learning approach ensures that I can implement modern, effective solutions in my network designs.


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