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System Administrator interview questions & mock practice

A System Administrator interview in 2026 runs across 4 rounds — os and server fundamentals, networking and security, scripting and automation, behavioural / incident. Below are the most-asked System Administrator interview questions and a focused prep plan. Rehearse every answer with OnJob's free AI mock interview and get instant, specific feedback before the real one.

LinuxWindows ServerNetworkingShell ScriptingPowerShellDNSSecurity HardeningVirtualization
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Step through the 12 most-asked System Administrator questions one at a time, under a timer, just like the real thing. Jot your answer, then reveal what a strong answer covers. No signup needed to practise.

Interview rounds

The System Administrator interview process

Linux and Windows server administration, networking, scripting and security — the sysadmin skills checked for infrastructure roles at Indian IT and managed service firms.

1

OS and server fundamentals

Linux and Windows administration, file systems, permissions and services.

2

Networking and security

DNS, DHCP, firewalls, ports and basic hardening practices.

3

Scripting and automation

Shell or PowerShell scripting and routine task automation.

4

Behavioural / incident

Handling outages, on-call experience and change management.

Most-asked questions

Most-asked System Administrator interview questions

12 of the questions System Administrator candidates are asked most often in India. Practise answering each one out loud in your AI mock interview.

  1. 1. What is the difference between a hard link and a soft link in Linux?
  2. 2. How do file permissions work in Linux and what does chmod 755 mean?
  3. 3. What is the boot process of a Linux system?
  4. 4. How do you check which process is using a particular port?
  5. 5. What is the difference between a process and a daemon?
  6. 6. How do you troubleshoot high CPU or memory usage on a server?
  7. 7. What is DNS and what is the difference between an A record and a CNAME record?
  8. 8. How do you set up a cron job and where are cron logs stored?
  9. 9. What is RAID and what is the difference between RAID 0, RAID 1 and RAID 5?
  10. 10. How do you check disk usage and free up space on a full root partition?
  11. 11. What steps do you take to harden and secure a new Linux server?
  12. 12. Describe a major server outage you handled and how you restored service.
How to prepare

How to prepare for your System Administrator interview

Be hands-on with Linux command line for users, permissions, processes, services, logs and disk management, as these are the core of every round.

Understand networking essentials including DNS, DHCP, firewalls, ports and how to trace a connectivity issue across layers.

Practise shell and PowerShell scripting to automate routine tasks like backups, log rotation and user provisioning.

Know your backup, RAID and disaster-recovery concepts and be able to explain your patching and change-management process.

Prepare a clear incident story showing how you diagnosed root cause under pressure and prevented a recurrence.

Practise other roles

Interview prep guides

System Administrator interview — FAQs

What questions are asked in a System Administrator interview?

Common System Administrator interview questions include: What is the difference between a hard link and a soft link in Linux? How do file permissions work in Linux and what does chmod 755 mean? What is the boot process of a Linux system? How do you check which process is using a particular port? Interviews usually run across 4 rounds — OS and server fundamentals, Networking and security, Scripting and automation, Behavioural / incident. Practice all of them with instant AI feedback using OnJob's free mock interview.

How many rounds are in a System Administrator interview?

A typical System Administrator interview has 4 rounds: OS and server fundamentals (Linux and Windows administration, file systems, permissions and services.); Networking and security (DNS, DHCP, firewalls, ports and basic hardening practices.); Scripting and automation (Shell or PowerShell scripting and routine task automation.); Behavioural / incident (Handling outages, on-call experience and change management.).

How do I prepare for a System Administrator interview?

To prepare for a System Administrator interview: Be hands-on with Linux command line for users, permissions, processes, services, logs and disk management, as these are the core of every round. Understand networking essentials including DNS, DHCP, firewalls, ports and how to trace a connectivity issue across layers. Practise shell and PowerShell scripting to automate routine tasks like backups, log rotation and user provisioning. Then run a full AI mock interview on OnJob to rehearse out loud and get instant, specific feedback before the real thing.

What skills do I need for a System Administrator role?

Core System Administrator skills tested in interviews include Linux, Windows Server, Networking, Shell Scripting, PowerShell, DNS, Security Hardening, Virtualization. OnJob shows you exactly which of these skills stand between you and a 100% match on every live System Administrator job.

Is OnJob's System Administrator mock interview free?

Yes. OnJob's AI mock interview is free to start (₹0) and gives you instant feedback on your answers. Pro (₹99/month) adds unlimited interview-prep AI alongside recruiter tracking and unlimited applications.

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Rehearse every System Administrator question out loud with OnJob's AI mock interview and get instant, specific feedback. Then apply to AI-matched jobs in one click — free to start.

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