Top-notch Network Engineer Interview guidance tailored for both entry-level candidates and experienced professionals, relevant for the year 2023-2024.
How would you describe yourself as a network engineer?
Can you explain the OSI model and its different layers? How does it relate to TCP/IP?
What are the differences between TCP and UDP, and in which scenarios would you use each?
What is the purpose of VLANs (Virtual LANs), and how do they improve network performance and security?
Can you explain the concept of subnetting and how it helps in efficient IP address allocation.
How do you troubleshoot and resolve common network issues, such as high latency, packet loss, or network congestion?
Can you describe the process of setting up and configuring a router and its routing protocols e.g., OSPF, BGP?
How do you secure a network against unauthorized access and potential threats?
What is the difference between static routing and dynamic routing? When would you use one over the other?
What are the different tunneling protocols e.g., IPsec, GRE, L2TP and their use cases.
How do you ensure high availability and redundancy in a network infrastructure?
How do you approach network design for a new project or infrastructure upgrade? What factors do you consider?
What is concept of Quality of Service and how it can be implemented to prioritize network traffic.
Have you worked with load balancers? If so, what types of load balancing algorithms have you used, and how do they distribute traffic?
How do you monitor and manage network performance? Are there any specific tools or techniques you prefer?
Can you explain the process of network device discovery and how you keep an inventory of all network devices?
Have you worked with any cloud networking technologies, such as AWS VPC or Azure Virtual Networks?
What is your experience with software-defined networking and network virtualization.
Have you dealt with any specific cybersecurity incidents or attacks on the network? How did you handle them?
Can you discuss your experience with different network monitoring and management tools(e.g., SNMP, NetFlow, Wireshark?
Scenario: The company's website is experiencing intermittent downtime and slow response times. How would you identify and mitigate the possible causes of this issue, considering both the network infrastructure and the web servers?
Scenario: A company wants to implement a guest wireless network to provide internet access for visitors without compromising the security of the internal network. How would you design and configure this guest network?
Scenario: The network is suffering from frequent broadcast storms, causing performance issues for all connected devices. How would you detect and prevent broadcast storms from impacting the network?
Scenario: The company wants to upgrade its existing network infrastructure to support 10 Gigabit Ethernet connectivity. What factors would you consider, and how would you plan the upgrade without disrupting the existing network?
Scenario: The company plans to implement a redundant network design to minimize downtime. Describe how you would design and implement redundancy for core network devices and links.