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IT interviews test two things: your technical knowledge and your ability to solve problems under pressure. The technical questions vary by role. The behavioral questions are the same across every IT role. Preparing for both separately is the most effective approach.

The biggest mistake in IT interviews is giving theoretically correct answers that do not connect to real experience. Every technical answer should be grounded in something you actually did — in a job, in your home lab, or in a class.

Behavioral Interview Strategy (STAR Method)

All behavioral questions follow the same structure. Answer using STAR:

  • S — Situation: Briefly describe the context.
  • T — Task: What was your specific responsibility?
  • A — Action: What steps did you take?
  • R — Result: What was the measurable outcome?

Prepare 5–7 STAR stories covering: a complex technical problem you solved, a time you worked with pressure, a conflict with a colleague, a time you had to learn something new quickly, and a situation where you had to explain something technical to a non-technical person.

Help Desk Interview Questions

Technical questions:

  • Walk me through the steps you take when a user says their computer won’t connect to the internet.
  • A user is locked out of their account at 8am before a presentation. What do you do?
  • What is the difference between DNS and DHCP?
  • How do you reset a password in Active Directory without resetting the user’s profile?
  • What troubleshooting tools are you comfortable with? (Expected: ping, tracert/traceroute, ipconfig/ifconfig, nslookup, Event Viewer)

Behavioral questions:

  • Tell me about a time you handled an extremely frustrated user. How did you de-escalate?
  • Describe a time you had multiple high-priority tickets at once. How did you prioritize?

Sysadmin Interview Questions

Technical questions:

  • What steps do you follow when deploying a new Windows Server?
  • How do you handle server patching? What do you check before and after?
  • Explain the difference between a full, incremental, and differential backup. Which do you use and why?
  • What is Active Directory and what are the core components? (Expected: domains, forests, OUs, GPOs, FSMO roles)
  • You get an alert that a server is running at 95% CPU. Walk me through your troubleshooting process.
  • What scripting languages are you comfortable with? (Expected: at minimum PowerShell or Bash)
  • How do you handle a situation where a disk is 90% full on a production server?

Behavioral questions:

  • Describe a significant outage you dealt with. What caused it, how did you respond, and what did you change afterward?
  • Tell me about a time you automated a recurring manual task.

Network Engineer Interview Questions

Technical questions:

  • Explain the difference between a router and a switch.
  • What is the purpose of spanning tree protocol (STP)?
  • You are experiencing intermittent packet loss between two sites. How do you troubleshoot?
  • What is OSPF and how does it differ from BGP?
  • A user says “the network is slow.” Walk me through your diagnostic process.
  • What is a VLAN and when would you use one?
  • Subnetting practice: Given the network 192.168.10.0/24, how many usable host addresses are there? (Expected: 254)

Subnetting questions are nearly universal in network engineering interviews. Practice until you can subnet in your head.

Behavioral questions:

  • Describe a network outage you managed. What was the root cause and what was your incident response?
  • Tell me about a time you improved network performance or reliability.

Cloud Engineer Interview Questions

Technical questions:

  • What is the difference between IaaS, PaaS, and SaaS?
  • Explain IAM policies in AWS (or Azure RBAC). How do you follow least-privilege principles?
  • A Lambda function (or Azure Function) is intermittently failing. How do you debug it?
  • What is a VPC/VNet, and what components does it contain?
  • Describe the difference between horizontal scaling and vertical scaling.
  • How do you approach cloud cost optimization?
  • What are the key differences between an EC2 instance type selection decision in a cost vs. performance scenario?

Behavioral questions:

  • Tell me about a cloud migration or deployment you led. What went wrong, and how did you handle it?
  • Describe how you have handled a situation where cloud costs were unexpectedly high.

Questions to Ask the Interviewer

Always prepare 3–4 questions for the interviewer. IT-specific options:

  • What does your on-call rotation look like and how is it structured?
  • What is the biggest technical challenge the team is working on right now?
  • How do you handle change management — is there a formal CAB process?
  • What does the career development and certification support look like here?

Next Steps