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Network Administrator interview questionsTechnical Interview round
A 60 min interview plan with a time-boxed script, what each question is for, and the signals to score against. Key skills: Networking Concepts, Protocols, TCP/IP, Routing and Switching, OSI Model.
Networking Concepts
15 min
What this section is for
Purpose
Assess understanding of fundamental networking concepts.
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Can you explain the difference between a switch and a router?
What this question is for, and what to listen for
Purpose
Evaluate understanding of basic networking devices.
Signals to score
- Correct differentiation made
- Understanding of switch functions
- Understanding of router functions
- Mention of data packet handling
- Explanation of network segmentation
- Mention of IP address routing
- Clarity in explanation
Follow-up questions
- What role does a switch play in a network?
- How does a router manage data packets?
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What is the OSI model, and why is it important?
What this question is for, and what to listen for
Purpose
Assess knowledge of networking frameworks and their importance.
Signals to score
- Correct OSI layers listed
- Importance of OSI model explained
- Mention of standardization
- Understanding of layer functions
- Explanation of troubleshooting benefits
- Clarity in explanation
Follow-up questions
- Can you name the layers of the OSI model?
- Why is the OSI model used in networking?
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How do you approach troubleshooting a network issue?
What this question is for, and what to listen for
Purpose
Evaluate problem-solving skills and approach to network issues.
Signals to score
- Structured approach described
- Mention of identifying the problem
- Use of diagnostic tools
- Consideration of network layers
- Logical reasoning applied
- Clarity in explanation
Follow-up questions
- What steps do you take first when troubleshooting?
- How do you use tools in your troubleshooting process?
Protocols and TCP/IP
15 min
What this section is for
Purpose
Assess understanding of key protocols and TCP/IP.
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Can you explain the function of TCP/IP in networking?
What this question is for, and what to listen for
Purpose
Evaluate understanding of TCP/IP protocol suite.
Signals to score
- Correct explanation of TCP/IP
- Mention of data transmission
- Understanding of IP addressing
- Explanation of TCP reliability
- Mention of packet switching
- Clarity in explanation
Follow-up questions
- What does TCP/IP stand for?
- How does TCP/IP facilitate communication?
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What is the difference between TCP and UDP?
What this question is for, and what to listen for
Purpose
Assess knowledge of transport layer protocols.
Signals to score
- Correct differentiation made
- Understanding of TCP reliability
- Understanding of UDP speed
- Mention of connection-oriented vs. connectionless
- Explanation of use cases
- Clarity in explanation
Follow-up questions
- How does TCP ensure reliable transmission?
- When would you use UDP over TCP?
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How do you secure a network using protocols?
What this question is for, and what to listen for
Purpose
Evaluate understanding of network security protocols.
Signals to score
- Mention of encryption protocols
- Understanding of VPNs
- Explanation of firewalls
- Mention of secure protocols like HTTPS
- Clarity in explanation
Follow-up questions
- What protocols can be used to encrypt data?
- How do VPNs enhance security?
Routing and Switching
15 min
What this section is for
Purpose
Assess knowledge of routing and switching concepts.
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How do you configure a VLAN on a switch?
What this question is for, and what to listen for
Purpose
Evaluate practical knowledge of VLAN configuration.
Signals to score
- Correct steps mentioned
- Understanding of VLAN purpose
- Mention of switch configuration
- Explanation of VLAN benefits
- Clarity in explanation
Follow-up questions
- What is the purpose of a VLAN?
- How do you assign ports to a VLAN?
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What is the purpose of a routing table?
What this question is for, and what to listen for
Purpose
Assess understanding of routing tables and their function.
Signals to score
- Correct explanation of routing table
- Mention of IP address mapping
- Understanding of route selection
- Explanation of network paths
- Clarity in explanation
Follow-up questions
- How does a routing table help in data transmission?
- What information is stored in a routing table?
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How do you handle a network loop issue?
What this question is for, and what to listen for
Purpose
Evaluate problem-solving skills in handling network loops.
Signals to score
- Mention of loop detection protocols
- Understanding of STP
- Explanation of loop prevention
- Clarity in explanation
Follow-up questions
- What protocols can prevent network loops?
- How does STP work?
Closing
5 min
What this section is for
Purpose
Thanks the candidate for their time, provides next steps, and leaves a positive final impression.
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Do you have any questions for me about the team or the company?
What this question is for, and what to listen for
Purpose
Gauge the candidate’s curiosity and interest in the role.
Signals to score
- Thoughtful questions asked
- Interest in company culture
- Curiosity about growth expressed
- Questions about role raised
- Inquiries about team challenges
- Engagement with responses shown
- Desire to learn next steps
- Focus on company values expressed
Follow-up questions
- What interests you most about this team?
- Are there any areas of the role you’d like to explore further?
Network Administrator interviews — common questions
- Who is this Network Administrator interview plan for?
- It is written for the interviewer, not the candidate: the hiring manager, engineer or panel member running the Technical Interview round for a Network Administrator role. It gives you a 60 min script to follow in the conversation — 10 questions with what each one is for and the signals to score against — so you are not writing the round from scratch the night before.
- What does the Technical Interview round assess?
- This round is focused on: Networking Concepts, Protocols, TCP/IP, Routing and Switching, OSI Model. It works through Networking Concepts, Protocols and TCP/IP, Routing and Switching and Closing, scoring against 49 observable signals, with follow-up prompts on all 10 questions for going deeper where an answer is thin.
- How is the 60 min split up?
- Networking Concepts (15 min), Protocols and TCP/IP (15 min), Routing and Switching (15 min), Closing (5 min). The timings are there so the round stays on schedule and every candidate gets the same shape of interview — which is what makes two candidates comparable afterwards.
- What other rounds should I run for a Network Administrator?
A single round does not cover a whole role. The other rounds in this library for a Network Administrator: