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

Applying for a Systems Administrator job in the UK? Here is what you are likely to be asked. These questions come from our Systems Administrator question bank of 25 questions, written for UK employers at mid-level level.

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

1. What does a systems administrator do, and what does a typical week look like?

Why they ask: They want to confirm you understand the responsibilities beyond fixing things when they break.

2. How does Active Directory work, and what are the main components you manage?

Why they ask: Active Directory remains central to most UK Windows environments.

3. How do you approach patching Windows and Linux servers?

Why they ask: Patch management is a major, risk-sensitive part of the role.

4. How would you design a backup and recovery strategy for a mid-sized business?

Why they ask: Backup and recovery is a core duty, and getting it wrong is career-defining.

5. Explain virtualisation and how you have used VMware or Hyper-V.

Why they ask: Most server estates are virtualised, so practical experience matters.

6. What's the difference between Microsoft Entra ID and on-premises Active Directory, and how does a hybrid identity setup work?

Why they ask: Hybrid identity is standard in UK organisations and tested often.

7. A server has run out of disk space and the application on it has stopped. What do you do?

Why they ask: Common real-world incident that tests calm, structured response.

8. Tell me about a server migration or upgrade you delivered with minimal disruption.

Why they ask: Projects show planning, risk management and communication.

A sample answer to question 1

What does a systems administrator do, and what does a typical week look like?

A systems administrator keeps servers, identity, storage, backups and core services secure, available and efficient. A typical week would include checking monitoring and backup reports, applying patches in a planned window, managing accounts and permissions in Active Directory and Entra ID, handling escalations from the service desk, and maintaining Microsoft 365, virtualisation and file services. I'd also work on projects, such as migrating a server, replacing storage or building a new environment, and update documentation as I go. Alongside this, I'd review security alerts and vulnerabilities, test restores and join change advisory board meetings. The balance between reactive work and planned improvement is important: I'd try to automate repeat tasks with PowerShell so I have time to prevent problems instead of only responding to them.

Common mistake to avoid: Describing it as only user admin; Ignoring planned work

Want the rest?

Full model answers, key points and common mistakes for all 25 questions are on the Systems Administrator interview questions page. The first five are free, no sign-up needed.