Interview Questions to Ask a Network Administrator Candidate
Questions that surface real evidence of reliable, secure network uptime that the whole organization depends on — plus what to actually listen for in the answer, not just whether they say the right buzzwords.
1. Users in one office say the internet is slow but others are fine. How do you isolate the problem?
What to listen for: Look for a methodical approach: confirm scope, check links, switches, wireless, and DNS, compare with working sites, and change one thing at a time.
2. How do you plan a network change, such as replacing a core switch, so the business barely notices?
What to listen for: Expect a maintenance window, saved configuration backups, a tested rollback plan, notification of users, and checks that everything works afterward.
3. A manager asks you to open a firewall port for a vendor quickly. How do you handle the request?
What to listen for: The candidate asks what is needed and why, limits the rule by source and time, documents it, and avoids opening broad access for convenience.
4. Tell me about a configuration mistake you made on a live network and how you recovered.
What to listen for: Honest ownership, a quick recovery using backups, communication with affected users, and a lasting habit such as peer review or staged changes.
5. What would you do in your first 30 days in this network administrator role?
What to listen for: Whether their plan is grounded in the role's actual must-haves (network configuration/administration (cisco/juniper) and firewall/vpn management) or generic ("get to know the team"). Specificity here signals real understanding of the job, not just interview prep.
6. Why are you leaving your current role, and why this one specifically?
What to listen for: Forward-looking motivation tied to something concrete about this role, versus badmouthing a past employer or vague dissatisfaction. Watch for whether their reasons actually match what this role offers.
A warning sign in this interview
Makes changes on live equipment without backups or a rollback plan, keeps no documentation, or cannot describe how they would find a fault methodically.
What to look for on the CV before the interview
Network size, vendors and incidents resolved.
Confirm before you make an offer
Vendor networking certifications are common. Confirm any on-call duty.
People who may apply under another title
This job is also called Network Engineer, Systems Network Administrator, IT Network Technician, Infrastructure Administrator. A candidate with one of those titles can be a strong match, so ask the same questions and judge the answers, not the title.
Frequently asked questions
How many of these questions should I ask in one interview?
3-4 is realistic for a 30-45 minute interview once you leave room for follow-ups and the candidate's own questions. Divide competencies across panel members rather than every interviewer asking all of them — see the Interview Scorecard tool for a structured version of this.
How is this different from the Interview Scorecard tool?
This page is a generic starting point for the network administrator role. The tool generates a full panel-ready kit — competency-grouped questions, a 1-5 rating rubric, and strong/weak answer examples — tailored to your actual job description and competencies.
What is a red flag when interviewing a network administrator?
Makes changes on live equipment without backups or a rollback plan, keeps no documentation, or cannot describe how they would find a fault methodically.
What should I confirm before offering a network administrator the job?
Vendor networking certifications are common. Confirm any on-call duty.
Hiring a network administrator? The rest of the toolkit
- How to write the job description →
Titles, must-haves, credentials and a starting posting.
- Search strings to find candidates →
Five searches from broad to narrow, with exclusions.
- Run the whole hire in one place →
Jobs, CV review, interviews, offers and checks together.