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System Administrator interview questions & mock practice

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What interview questions are asked for a System Administrator?

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 out loud with the free timed practice below before the real one.

  • Linux
  • Windows Server
  • Networking
  • Shell Scripting
  • PowerShell
  • DNS
  • Security Hardening
  • Virtualization

Free interview practice · System Administrator

Practise your System Administrator interview now — free

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 the timed practice above.

  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.

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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. Practise them with the free timed practice on this page.

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 rehearse every question out loud with the timed practice on this page 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 the System Administrator mock interview practice free?

Yes. The questions, the answer guidance and the timed practice on this page are free and need no signup. With a free OnJob account you can also take timed role tests and free certification tests. Personalised AI role and skill tests are part of the paid plans.

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