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1
참고 답변
Types: - Site-to-site VPN - Remote access VPN - SSL VPN
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Effective traffic monitoring and management involve using tools like Wireshark or tcpdump to analyse traffic in real time. This helps identify traffic distribution, peak periods, and protocol usage. Based on the analysis, you can optimize traffic by reallocating bandwidth or restricting P2P downloads.
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3
참고 답변
I've led several major vendor selection processes. My approach starts with defining detailed technical requirements based on our needs, not vendor capabilities. Then I evaluate multiple vendors against those requirements. I don't just look at product specifications—I run proof-of-concept tests, talk to references from similar organizations, and assess support quality and availability. For a major switching upgrade, I narrowed it down to two vendors and negotiated heavily on pricing, warranty terms, and support response times. The vendor who won wasn't necessarily the cheapest, but they offered the best overall value: strong technical support, favorable upgrade paths, and terms that gave us flexibility as our needs evolved. I also negotiate maintenance agreements carefully—the difference between 4-hour and 8-hour response SLAs can be significant, so I price that appropriately to my budget.
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802.1x: IEEE standard for port-based network access control, providing an authentication framework for wireless LANs. It authenticates devices wishing to attach to a LAN or WLAN through a central authority.
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As a network engineer, you'll need specific skills in your daily toolbox that are foundational to the field. You want to be well-versed in protocols such as TCP/IP, OSI, BGP, and others, so review how you've interacted with these network fundamentals in your professional life. Also, come up with examples of this work that can help you stand out from other applicants. Discuss projects in which you were responsible for fundamentals and try to bring up other technical skills you utilized on these projects to illustrate how your skill set fits your everyday work environment.
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This question tests knowledge of Frequency Hopping Spread Spectrum (FHSS) and Direct Sequence Spread Spectrum (DSSS) and their appropriate applications.
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As a Document Controller, I start by establishing a document's purpose. This ensures it serves a clear business need. Next, I create the document using standard templates for consistency. This also includes assigning a unique identifier for easy tracking. During its active phase, I ensure regular reviews and updates. This helps keep the document relevant and useful. When a document becomes obsolete, I follow a strict archiving process. This includes recording the reason for archiving. Finally, I dispose of the document securely. This is to protect sensitive information and comply with data protection laws.
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EIGRP (Enhanced Interior Gateway Routing Protocol) is a hybrid routing protocol combining features of distance-vector and link-state protocols. It uses the Diffusing Update Algorithm (DUAL) for rapid convergence and minimizes network disruptions. Unlike RIP, which has a hop limit and slower convergence, EIGRP supports classless routing, VLSM, and complex metrics. Compared to OSPF, EIGRP is easier to configure and scales well in diverse networks, though it is proprietary to Cisco devices, limiting its interoperability with non-Cisco equipment.
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The OSI (Open System Interconnection) is a reference model that has the necessary protocols and standards for communicating over a network. The model was made by the International Organization for Standardization (ISO) in 1984. It consists of seven layers, where each layer has a different function. These layers are Physical Layer, Data Link Layer, Network Layer, Transport Layer, Session Layer, Presentation Layer, and Application Layer.
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WLAN-11ac has been introduced after previous versions of WLAN, which include 802.11a, 11b, 11g, and 11n. An 80MHz channel bandwidth is added. The number of MIMO streams has been enhanced to eight. 256QAM has been added.
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This is complex because each cloud provider has their own networking model, and you need consistency across all of them. Connectivity: I'd implement SD-WAN or a similar overlay network. This abstracts the underlying connectivity—whether it's on-premises, AWS, Azure, or GCP. It gives you visibility and control across all connections. Security architecture: Define a consistent security model—maybe zero-trust, where every connection is authenticated and authorized regardless of where it originates. Use a cloud-native security platform that can operate across multiple clouds and on-premises. Implement consistent network segmentation policies—users and workloads should have the same access rules whether they're on-premises or in cloud. Management: Implement a multi-cloud management platform that gives you unified visibility and control. Some examples are tools from vendors like Cisco, VMware, or open source options. The goal is single pane of glass for networking across all environments. Specific implementation: Maybe on-premises infrastructure connects through SD-WAN to a central hub. Each cloud provider has a similar SD-WAN endpoint or native gateway. Traffic between locations flows through this overlay, giving you visibility and control. Security policies are defined once and enforced consistently everywhere. Cost optimization: By not locking into any single cloud provider, you maintain flexibility. You can move workloads or use different clouds for different purposes based on cost and capability, not because you're locked in. This architecture is complex, but organizations increasingly need it. The payoff is flexibility, security consistency, and the ability to optimize costs.
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Data Link layer (Layer 2) and Transport layer (Layer 4) both perform error detection, but the Transport layer (TCP) ensures reliable transmission.
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• Network congestion. • Faulty hardware or cables. • Misconfigured routers or switches. • High CPU or memory usage on network devices.
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Introduced in 1999, 802.11b operates in the 2.4 GHz frequency band and offers a maximum data rate of 11 Mbps. It uses direct-sequence spread spectrum (DSSS) technology. It has a longer range than 802.11a, but its lower frequency makes it more prone to interference from other devices.
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SDN (Software-Defined Networking) separates the control plane from the data plane, allowing network management through centralized software. It differs from traditional networking, where control and data planes are integrated into the hardware. For example, SDN enables dynamic network management and automation, improving efficiency and flexibility.
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Network monitoring and management tools help in tracking network performance, identifying issues, and ensuring optimal operation. They provide real-time data, alerts, and analytics. For example, tools like SolarWinds and Nagios monitor network traffic, detect anomalies, and generate reports for proactive management.
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IoT (Internet of Things) connects physical devices to the internet, enabling remote control and data sharing.
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IPv4 uses a 32-bit address scheme allowing for 4.3 billion unique addresses, whereas IPv6 uses a 128-bit address scheme, significantly increasing the number of possible addresses to accommodate the growing number of internet-connected devices. For instance, an IPv4 address appears as 192.168.1.1, whereas an IPv6 address is formatted like 2001:0db8:85a3:0000:0000:8a2e:0370:7334.
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- Check physical connections - Use ping and traceroute - Analyze configurations (show run) - Review logs (show log, Syslog) - Verify interface status (show ip interface brief)
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This question assesses problem-solving and project management skills. Candidates should provide a detailed account of a complex project, including the challenges faced and how they were overcome. Look for evidence of leadership and innovation.
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Staying updated involves continuous learning through industry certifications, attending conferences, participating in webinars, reading technical blogs and journals, and joining professional networking groups. For example, I follow networking forums and subscribe to newsletters from leading tech companies like Cisco and Juniper.
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A switch and a hub are both networking devices that connect multiple devices together on a network, but they operate differently. A hub is a basic network device that connects multiple devices together on a Local Area Network (LAN) and sends incoming data packets to all connected devices, regardless of the intended recipient. This can lead to lots of unnecessary network traffic, plus it's not exactly secure, since all the data is sent to all devices. A switch, on the other hand, is a bit smarter. It can examine and understand the data it receives, and it can direct data to a specific device on the network instead of all of them. It does this by maintaining a list of all the devices connected to it and the corresponding physical (MAC) addresses. This contributes to a much more efficient and secure network because the data only goes where it needs to. So, in essence, while both switches and hubs are used for connecting devices in a network, switches offer better performance and security due to their ability to direct traffic rather than just broadcasting it to all connected devices.
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A default gateway is an essential component of networking that acts as a bridge connecting your local network to the internet. When a device wants to communicate with a system outside its local network, it doesn't always know the pathway to that external network, that's where a default gateway comes in. Consider the gateway as a translator between a small local network and the vast internet. When a device sends a request to access a resource outside its local network, that request is sent to the default gateway. The gateway, usually your router, then takes it from there to send the request to the internet. In other words, the default gateway is the device that routes traffic from the local network to other networks or subnets. Without it, your local network would be an island isolated from the rest of the digital world.
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NAT (Network Address Translation) allows private IP addresses to connect to the internet by translating them to a public IP.
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There is biometrics (e.g. a thumbprint, iris scan), a token, or a password. There is also two-level authentication, which employs two of those methods.
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A VLAN (Virtual Local Area Network) allows logical segmentation of a network into smaller groups, improving performance and security.
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ACLs filter traffic based on IP, protocol, or port. Types: - Standard ACL: Filters by source IP. - Extended ACL: Filters by source, destination, protocol, and port.
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Areas to Cover: - The performance issues or requirements - Analysis and diagnostic approach - Technologies or configurations implemented - Testing methodology - Collaboration with application teams - Measured improvements - Ongoing monitoring strategy Follow-Up Questions: - What tools did you use to baseline and measure performance? - How did you identify the root cause of performance issues? - What tradeoffs did you consider in your optimization strategy? - How did you ensure the optimizations would be sustainable?
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A network engineer designs, implements, maintains, and manages network systems. Key qualities include strong foundational knowledge, practical experience, problem-solving abilities, continuous learning, and keen insight into new technologies. Soft skills such as teamwork, communication, and customer service are also essential.
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Network security involves measures and protocols designed to protect the integrity, confidentiality, and availability of data and resources on a network. It is important because it helps prevent unauthorized access, data breaches, and attacks that can disrupt network operations, compromise sensitive information, and damage an organization's reputation.
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I stay updated with industry standards and regulations by regularly attending compliance training and subscribing to relevant publications. During the design process, I implement compliance checks and conduct regular audits to ensure our network meets all legal and industry-specific requirements.
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A subnet mask is employed to split an IP address into its network and host segments. It aids in determining the network to which an IP address is associated. For instance, with the IP address 192.168.1.10 and a subnet mask of 255.255.255.0, the network portion is 192.168.1, while the host portion is 10.
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Channel width affects the data rate and bandwidth of a wireless network. Wider channels (e.g., 40 MHz, 80 MHz) provide higher throughput but can also increase interference. Properly selecting channel width helps balance performance and interference.
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Monitoring tools like SolarWinds, PRTG, Wireshark, and Cisco Prime Infrastructure help analyze bandwidth, detect failures, and ensure SLA compliance.
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Latency is the time it takes for data to make a round trip. We measure latency in milliseconds. A low number is good. A high number is bad. You send a message and wait for a response. The time you wait is referred to as latency. It is the time for a signal to travel to a server and then come back to you. When playing an online game, low latency is crucial. High latency causes lag. It makes the game feel slow. The same applies to video calls. High latency makes conversations difficult. It is not the same as speed. Speed, or bandwidth, is how much data you can move at once. Latency refers to the time it takes for any piece of data to travel. You can have a fast connection with bad latency. This would feel like a big highway with a long delay at a traffic light.
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Areas to Cover: - The circumstances requiring the change - Initial response and assessment - Decision-making process - Communication with stakeholders - Implementation of changes - Impact on timeline or budget - Lessons learned about design flexibility Follow-Up Questions: - What factors did you miss in the initial design phase? - How did you communicate the needed changes to stakeholders? - What steps did you take to minimize disruption from the redesign? - How did this experience change your approach to design planning?
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We had a production outage affecting about 200 users across our main office. Customer-facing systems were down, and the VP of Sales was obviously concerned about revenue impact. Instead of panicking, I followed a systematic approach. I started at Layer 1—verifying all physical connections and links were up. Then Layer 2—checked spanning tree and VLAN configurations. By the time I got to Layer 3, I'd narrowed it down to a routing protocol issue on our core switch. A recent configuration change had caused OSPF to fail over incorrectly. I rolled back that specific change, verified connectivity was restored, and we were back online in about 45 minutes. After the incident, I implemented a more rigorous change control process and added monitoring alerts for critical routing metrics.
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As a Document Controller, I thrive under transformational leadership. This style encourages innovation, motivates me to exceed expectations, and promotes a collaborative environment. Your company's leadership style, as I understand, values team collaboration and innovation. This aligns perfectly with my optimal working conditions. Overall, I see a harmonious fit between my preference and your company's leadership style.
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STP (Spanning Tree Protocol): Enabled to prevent network loops.
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A port number is a logical number used by computers to identify all the services or applications running on a device. A Computer can perform many services at the same time, like: - Web browsing - File transfer - Video calls, etc. Now, the computer needs a way to understand which data belongs to which application. That is where the port number is used. Think of a computer like a big apartment building. - The IP Address is the building address. - The port number is the apartment number. The IP Address helps the data reach the correct computer, and the port number helps the data reach the correct application inside the computer. Port number ranges from 0 to 65535. Well-known ports are standard ports that are used by common network services. These numbers are fixed so that devices know which service they should connect to. Some well-known ports are: | Port Number | Protocol/Service | Purpose | | 20/21 | FTP | File transfer | | 22 | SSH | Secure remote login | | 23 | Telnet | Remote login (not secure) | | 25 | SMTP | Sending emails | | 53 | DNS | Domain name to IP conversion | | 67/68 | DHCP | Automatic IP address assignment | | 80 | HTTP | Normal web browsing | | 110 | POP3 | Receiving emails | | 143 | IMAP | Email access | | 443 | HTTPS | Secure web browsing |
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Optimizing multicast traffic is crucial for efficient data distribution. My approach to optimizing multicast traffic in an enterprise network includes the following: - IGMP Snooping: Reducing unnecessary traffic by ensuring multicast traffic is only forwarded to subscribed hosts. - PIM Configuration: Choosing the appropriate PIM mode (Sparse or Dense) based on network topology. - RP Optimization: Using Anycast RP for redundancy and load balancing. - QoS for Multicast: Prioritizing multicast traffic to ensure smooth video and voice streaming. - Traffic Analysis: Monitoring multicast traffic using tools like Wireshark and NetFlow.
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Interviewers will typically ask these types of network engineer interview questions as they'll want to know if you have experience designing, implementing and troubleshooting networks similar to or the same size as the networks they and their clients use. When it comes to these types of network engineer interview questions and answers, here's an example of a response you could give: âAmong the networks I've designed, implemented, and provided troubleshooting support on, the biggest one I worked on was with my former employer. This project involved interconnecting numerous locations across the country, providing seamless communication for their employees working both onsite and remotely around the world - the latter of which involved me setting up secure VPNs to enable safe access to the network from remote locations.â Even if you have yet to work on networks of the same scale, this won't necessarily mean you won't fit the employer's requirements. Your enthusiasm and other credentials will always be taken into account.
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Wireless network redundancy can be implemented by using multiple access points and wireless controllers, configuring load balancing, and employing failover mechanisms. This ensures continuous network availability and reliability in case of device failures.
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I could instantly deliver a 5-minute presentation on "The Importance of Network Security in Today's Digital Age". With the rapid digitization of businesses, network security has become a crucial aspect. It's not just about securing data anymore; it's about safeguarding the business's entire digital infrastructure. - I'd start with an overview of network security, its importance, and its role in modern businesses. - Next, I'd discuss the potential threats and risks that businesses face without robust network security. - Lastly, I'd offer practical solutions and strategies to strengthen network security, including firewalls, intrusion detection systems, and regular audits. This topic is not only relevant but also critical for businesses to understand and implement effectively.
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Bash helps automate repetitive actions on Unix-based systems and simplifies tasks like configuring network interfaces, managing firewall rules, and performing routine maintenance.
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| IDS | IPS | |---|---| | Detects threats | Prevents threats |
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A wireless mesh network consists of interconnected nodes that share data dynamically and efficiently.
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Effective strategies include capacity planning, traffic analysis, QoS configurations, WAN optimization, load balancing, and regular performance monitoring to proactively identify and resolve bottlenecks.
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This is usually the last question of your interview, and it's a good way to show your interest and knowledge of the company or organization you're interviewing with. Demonstrate your interest in the company by coming prepared with a few questions to ask or think about questions during the interview process that you'd like a potential employer to expand on. You may want to ask about how a network engineer fits into the company's overall goals, what the company culture is like, or questions about the company's role in its particular industry.
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This question evaluates self-awareness and a candidate's proactive approach to professional development and improvement.
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No.routing tables in the datagram network have two entries with the same destination address, not possible because the destination address or receiver address is unique in the datagram network.
52
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Using scripts and tools like: - Python - Ansible - Terraform
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At Telefonica, I led a project to redesign our data center network, which was facing severe latency issues. I implemented a spine-leaf architecture that reduced latency by 70% and improved throughput by 50%. This redesign not only enhanced performance but also cut operational costs by 30% due to more efficient resource utilization. The experience taught me the importance of aligning technical solutions with business needs.
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The wavelength division multiplexing is commonly used in fiber optic links.
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To configure a guest network: - Create a new WLAN for guest access on the controller. - Configure SSID, security settings, and VLAN assignment for the guest network. - Set up a captive portal for guest authentication. - Apply QoS and bandwidth policies to manage guest traffic.
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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 |
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- Supports Up to 1500 Access Points.
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One main challenge is interference from other networks. I use spectrum analysis tools to identify these interferences early on and propose frequency planning to minimize overlap. Additionally, I ensure proper antenna selection and placement.
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This question probes the candidate's understanding of beamforming challenges, such as null steering and client compatibility.
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First, I would identify critical network components and evaluate the risks associated with each. Then, I'll define the RTO and RPO for these components to understand how quickly we need to recover and how much data loss is acceptable. Next, I'd implement redundancy, such as backup servers and a failover system. Regular testing of the disaster recovery plan would be crucial, so I would schedule simulations to ensure readiness. Finally, I'd document the entire process and provide training for the team to ensure everyone knows their role during a disaster.
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The OSI or Open Systems Interconnection model is a theoretical framework designed to comprehend network interactions across seven distinct layers: Physical, Network, Data Link, Transport, Session, Presentation, and Application. Each layer has a unique role and interacts with the layers immediately above and below it. For example, the Physical layer deals with the actual hardware connections, while the Application layer is where user applications interact with the network.
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WLAN: Similar to SSID, required for client association with the network.
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Multicast is a network addressing method for delivering information to a group of destination computers simultaneously within a network. It bridges the gap between unicast (one-to-one) and broadcast (one-to-all) communication modes. In multicast communication, the source sends a single set of packets which is then delivered to a group of recipients, identified by a multicast group address, thereby reducing network traffic and ensuring more efficient data distribution when sending the same data to multiple recipients. A typical use case for multicasting is streaming media, such as video or audio broadcasts. If a server is streaming a live event, it would send out a single stream of information - let's say one video feed - to the multicast group address. Any device that wants to view the event would then join the multicast group and receive the data. The multicast process is managed and optimized through protocols like Internet Group Management Protocol (IGMP) for managing group membership and Protocol Independent Multicast (PIM) for routing the multicast traffic to the interested receivers. These mechanisms ensure efficient data delivery without overloading the network or the source device.
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In computer networks, reliable data delivery is important. The Transmission Control Protocol guarantees in-order and error-free data transfer using flow control. This is to prevent the sender from flooding the receiver so as to make sure it can work efficiently in turn. TCP utilizes a sliding window protocol for flow control. The receiver advertises a window size, indicating the number of bytes its buffer can hold. The sender transmits data segments up to this advertised window
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802.11a operates in the 5 GHz frequency band and offers a maximum data rate of 54 Mbps. It was the first standard to use orthogonal frequency-division multiplexing (OFDM) for more efficient data transmission. However, it has limited range and is more susceptible to interference.
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Cloud technology is increasingly important. Candidates should discuss their experience with cloud platforms like AWS, Azure, or Google Cloud, and how they have integrated these into network designs. Good answers will include specific examples of cloud-based projects.
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- Faster deployments - Reduced errors - Scalability
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Public and private IP addresses refer to the type of Internet Protocol (IP) addresses that devices can be assigned in a network. A public IP address, as the name suggests, is an IP address that is uniquely identifiable across the internet. It's the principal address that your Internet Service Provider (ISP) assigns to your router or modem. It's visible to the entire internet, much like your physical home address. Private IP addresses, on the other hand, are used within internal networks and can't be directly accessed over the internet. These are typically used for local devices within your home or work network, such as your desktop, laptop, or smartphone. While thousands of devices might have the same private IP, they each have a unique public IP that's used for communication outside their local network. So, by analogy, if the internet was a city, then your public IP would be your home's street address, visible to everyone, and your private IP would be like your bedroom's location within your home, known only to the residents.
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Bandwidth refers to the maximum data transfer capacity of a network connection, measured in Mbps or Gbps.
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At my previous job, I implemented SD-WAN to improve our branch connectivity. We needed to reduce latency and improve reliability due to increased remote work. I analyzed our existing setup and proposed SD-WAN. After implementation, we saw a 30% reduction in latency and our user satisfaction scores improved significantly.
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Networking teams are becoming more collaborative with other teams, such as development teams, with different team members working together toward a common project goal. This question is a good time for you to talk about your teamwork skills and give examples of when you collaborated with other team members or other computer and IT groups in your company and what you achieved. Your previous experience is a good indicator of how you can work within a team environment when you join a new company or organization.
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Beacon, Probe Response, Assoc Req, Re-association Req, 11r Re-association response
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A default gateway is a router that acts as a central point for forwarding data to external networks.
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Once, a project manager insisted on using outdated documents for a critical task. This posed a risk to the project's success. I explained the potential issues and the importance of using the most recent document versions. Still, he was adamant. So, I escalated it to senior management. I presented the situation, my conversation with the project manager, and the potential risks involved. They intervened, and the project manager agreed to use the updated documents. This experience taught me the importance of effective communication and standing firm on document control policies.
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Network traffic monitoring and analysis are crucial for understanding performance, detecting anomalies, and optimizing resources. Tools like SNMP, NetFlow, and sFlow can collect traffic data, and analysis tools like nfdump and nfsen can visualize and analyze it.
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TCP window scaling allows the TCP window size to be increased beyond the 16-bit limit, improving performance on high-latency or high-bandwidth networks.
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I have optimized BGP in large-scale networks by implementing route filtering, traffic engineering with BGP attributes (AS-path, MED, local preference), and leveraging route reflectors to improve scalability. I use BGP peering with multiple ISPs for redundancy, optimize prefix aggregation to reduce overhead, and monitor route stability to ensure efficient, resilient, and high-performance network routing.
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Blockchain ensures secure, transparent, and tamper-proof transactions and communications in decentralized networks.
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Network topology refers to how devices, also known as nodes, within a network are arranged and how they connect to each other. There are several main types of network topologies: Star Topology: In this setup, all devices connect to a central hub or concentrator. This is one of the most common arrangements because if a single connection fails, it doesn't affect the rest of the network. Bus Topology: In a bus topology, all devices connect to a single, central cable known as the 'bus'. While this topology is simple and inexpensive, if the main cable encounters a problem, the entire network can be affected. Ring Topology: As the name suggests, this topology arranges devices in a circular pathway. Each device connects to two others, forming a ring. Information travels around this ring in one direction. This topology can handle high volumes of traffic, but if one connection fails, it can impact the whole network. Mesh Topology: In this arrangement, devices are interconnected, with many redundant interconnections. This redundancy means that if one connection fails, there are multiple paths to ensure data can reach its destination. Hybrid Topology: This type combines two or more different topologies into one network. For example, a star-bus network topology combines multiple star topologies on a single bus. These are just a few examples, and the choice of topology depends on factors such as the specific requirements of the network, cost, and ease of maintenance.
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Routers operate at the Network Layer, using IP addresses for routing, while switches operate at the Data Link Layer, using MAC addresses for data forwarding. Routers connect different networks, whereas switches manage data within the same network.
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The full form of NIC is the Network Interface Card, which is a peripheral card connected to the PC to link to the network, and each NIC has its own MAC address that locates PCs over the network. It provides a wireless connection to a local area network and is allowed on desktop computers.
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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.


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