Network Administrator Interview Questions UK: 8 Real Questions and What Interviewers Want

Most Network Administrator interviews in the UK follow a pattern, and knowing it beats guessing. Below are eight questions from our bank of 16, each with a note on what the interviewer is really after.

Eight Network Administrator interview questions, and what the interviewer is thinking

1. What does your day-to-day network administration involve, and which tools do you use to monitor and manage the network?

Why they ask: To understand their hands-on experience and tooling.

2. How would you design and secure a VPN solution for remote workers and for a site-to-site link?

Why they ask: To test knowledge of secure connectivity.

3. How do you plan and troubleshoot an enterprise wireless network?

Why they ask: To check wireless design and troubleshooting competence.

4. What is network segmentation, and how would you apply it to improve security?

Why they ask: To test security design thinking.

5. How would you set up and use port security and 802.1X to control access to the wired network?

Why they ask: To test access control knowledge.

6. The internet connection at head office has been intermittently dropping for three days. How do you approach it?

Why they ask: To test structured diagnosis involving providers.

7. Tell me about a time you diagnosed a difficult network problem. What was the cause and how did you find it?

Why they ask: To assess real troubleshooting ability.

8. What qualities make a good network administrator, and where do you see your career developing?

Why they ask: To gauge self-awareness and ambition.

A sample answer to question 1

What does your day-to-day network administration involve, and which tools do you use to monitor and manage the network?

My day starts with checking the monitoring dashboards for overnight alerts, using tools such as PRTG, SolarWinds or LibreNMS, which poll devices over SNMP and show interface utilisation, errors, latency and device health. I review the ticket queue for network issues and any planned changes. Routine tasks include adding VLANs and ports, updating firewall rules after approval, managing DHCP scopes, checking wireless controller dashboards, and keeping firmware current. I use a configuration management tool, such as RANCID or Oxidized, to back up device configs nightly and compare changes. I also use Wireshark for packet analysis when needed, and syslog for central logging. I keep network diagrams and IP address management records up to date in Visio and our IPAM tool. Beyond the daily work, I plan upgrades, review capacity trends and support projects like office moves, always following change control.

Common mistake to avoid: Listing tools without explaining use; Ignoring documentation

Want the rest?

Full model answers, key points and common mistakes for all 16 questions are on the Network Administrator interview questions page. The first five are free, no sign-up needed.