Systems Administrator Interview Questions — 30+ Questions & Expert Answers

Systems administrators held 331,500 jobs in 2024, and while the BLS projects a 4% employment decline through 2034 as some tasks shift to DevOps and cloud-managed services, approximately 14,300 openings are still projected annually due to retirements and role transitions [1]. The median salary of $96,800, with the top 10% earning over $150,320 [1], makes this a well-compensated role — but interviewers expect candidates who can demonstrate expertise across Windows, Linux, cloud platforms, and increasingly, automation and infrastructure-as-code skills. This guide covers the behavioral, technical, and situational questions that separate strong sysadmin candidates from those stuck in a manual operations mindset.

Key Takeaways

• Sysadmin interviews in 2026 test both traditional infrastructure knowledge (AD, DNS, DHCP, backup/recovery) and modern skills (cloud platforms, automation, containerization) [2].
• AI tools are automating routine monitoring and patching tasks — interviews now focus more on strategic thinking and problem-solving than rote command memorization [3].
• Expect scenario-based questions that present server crashes, security breaches, or network outages and evaluate your diagnostic methodology.
• Demonstrating automation skills (PowerShell, Bash, Ansible, Terraform) is increasingly a requirement rather than a differentiator [2].

Behavioral Questions

1. Tell me about a time you resolved a critical server outage that affected the entire organization.

Expert Answer: "At 6:30 a.m. on a Monday, I received alerts that our Exchange server was unresponsive, affecting email for 400 users. I remoted into the server and found it in a reboot loop — the Event Viewer showed a STOP error related to a kernel-mode driver. I booted into Safe Mode, identified that a Windows Update from the previous evening had installed a driver update that conflicted with our RAID controller. I rolled back the driver using DISM, rebooted normally, and had email restored by 7:45 a.m. — before most users arrived. I then configured WSUS to defer driver updates by 7 days and added the specific driver to our block list. I documented the incident and added a maintenance window verification step to our patching process so automatic updates don't install during business hours."

2. Describe a situation where you had to manage competing priorities from multiple departments simultaneously.

Expert Answer: "During a quarter-end period, I received three urgent requests within one hour: finance needed their reporting server restored from backup after a database corruption, the sales team needed 15 new laptops provisioned for starting employees the next day, and the CEO needed VPN access configured for an overseas trip departing that evening. I triaged by business impact: the finance server was blocking quarter-end reporting (regulatory deadline), so it was top priority. I initiated the database restore from our Veeam backup and set it to run while I configured the CEO's VPN (15-minute task). I then delegated the laptop provisioning to my junior admin with a checklist I maintained for exactly this scenario — standard image, domain join, printer mapping, and O365 licensing. All three were completed by end of day. The key was having documented, repeatable processes that allowed delegation."

3. Give an example of how you improved a process or system proactively, not in response to an incident.

Expert Answer: "I noticed our backup verification process was purely log-based — we checked whether Veeam jobs reported success, but never tested whether the backups were actually restorable. I proposed and implemented a monthly backup verification protocol: every month, I randomly selected two production server backups, restored them to an isolated recovery network, and verified that the services started and data was intact. In the second month of testing, I discovered that our SQL Server backups were completing successfully but the transaction log backups were silently failing due to a disk space issue on the backup repository. If we'd needed to restore that database, we would have lost a week of transactions. Proactive testing caught the issue before it became a disaster."

4. Tell me about a time you had to explain a technical decision to non-technical leadership.

Expert Answer: "When I proposed migrating from on-premises Exchange to Microsoft 365, the CFO was skeptical about the monthly subscription cost compared to our 'already paid for' on-premises server. I reframed the conversation in financial terms: our Exchange server was 5 years old, approaching end-of-life, and would need a $45,000 hardware replacement plus $15,000 in licensing and labor for migration. The M365 subscription would cost $12,000/year for our organization, which means the cloud option was cheaper than hardware replacement within 5 years — and we'd gain automatic updates, 99.9% SLA availability, built-in security features, and eliminated backup management. I also calculated the risk cost: our on-premises server had experienced 3 unplanned outages last year totaling 14 hours of downtime. At an estimated $2,000/hour in lost productivity, that's $28,000 in downtime cost we'd largely eliminate. The CFO approved the migration."

5. Describe how you handle knowledge transfer and documentation.

Expert Answer: "I maintain a documentation-as-I-go practice: when I build, configure, or troubleshoot any system, I document the process in our IT knowledge base (Confluence) before I consider the task complete. Every documented procedure includes: purpose, prerequisites, step-by-step instructions with screenshots, verification steps, and a troubleshooting section for known issues. I also maintain network diagrams (updated quarterly using draw.io), a server inventory with configurations and lifecycle dates, and runbooks for common operational procedures. When I hired a junior admin, I had them follow my documentation to perform routine tasks without my assistance — any step that was unclear or incomplete, they flagged, and I refined. Documentation quality is measured by whether someone else can follow it successfully without asking the author for clarification."

6. How do you approach learning new technologies as the industry evolves?

Expert Answer: "I allocate 5 hours per week to professional development, split between hands-on lab work and structured learning. I maintain a home lab (Proxmox hypervisor, 3-node cluster) where I test technologies before recommending them for production — I've used it to evaluate Kubernetes, Ansible playbooks, and Zero Trust architectures. For structured learning, I pursue one major certification per year — I've completed MCSE, CompTIA Security+, and most recently AWS Solutions Architect Associate. I also follow r/sysadmin and relevant tech blogs for real-world implementation perspectives. When our organization considered containerization, I spent four weeks building a Docker/Kubernetes lab environment, deploying test applications, and documenting the operational requirements before presenting a recommendation to my manager."

Technical Questions

1. Explain Active Directory and how you would troubleshoot a user unable to log in.

Expert Answer: "Active Directory is Microsoft's directory service for managing users, computers, groups, and policies in a Windows domain environment. It uses LDAP for directory queries, Kerberos for authentication, and DNS for service location. For a user unable to log in, I troubleshoot systematically. First, verify the account status in ADUC (Active Directory Users and Computers): is the account locked out (failed password attempts), disabled, or expired? If locked out, unlock it and investigate why — check the account lockout source using EventCombMT or PowerShell's Search-ADAccount -LockedOut to identify the device generating failed attempts. Second, check password status: has the password expired? Is the user typing it correctly (Caps Lock, keyboard layout)? Third, check Group Policy: has a new GPO restricted logon rights for the user's OU? Run gpresult /r on the workstation to see applied policies. Fourth, check network connectivity: can the workstation reach a domain controller? Run nltest /dsgetdc:domain.com to verify DC discovery. Fifth, check replication: is the DC the workstation authenticated against up to date? Run repadmin /showrepl to verify AD replication health [4]."

2. How do you manage and deploy operating system patches in an enterprise environment?

Expert Answer: "I use a phased patch management approach. Week 1 (Patch Tuesday + 3 days): patches release, I review the Microsoft Security Response Center advisories, identify critical and high-severity patches, and check for known issues on r/sysadmin and Patch Management.org. Week 1-2: deploy to a test group — 10 workstations and 2 non-critical servers that represent our hardware/software configurations. Monitor for 5 business days for instability. Week 2-3: deploy to the general workstation population using WSUS or Intune, scheduled outside business hours. Week 3-4: deploy to production servers during maintenance windows with proper change management (change request, backout plan, stakeholder notification). I enforce a 14-day compliance window for workstations and 30 days for servers. For zero-day patches (actively exploited), I compress the cycle to 48-72 hours for critical systems with emergency change approval. I track patch compliance using WSUS reports and present monthly compliance dashboards to management [3]."

3. Explain DNS and walk through what happens when a user types a URL into their browser.

Expert Answer: "DNS (Domain Name System) translates human-readable domain names to IP addresses. When a user types example.com: the browser checks its local cache. If not cached, the OS checks its DNS resolver cache (ipconfig /displaydns on Windows). If not cached, the query goes to the configured DNS server (typically the internal DNS server in an enterprise). The internal DNS server checks its cache and zone files. If it doesn't have the record, it performs recursive resolution: it queries a root nameserver, which directs it to the .com TLD nameserver, which directs it to example.com's authoritative nameserver, which returns the IP address. The internal DNS server caches the result (TTL-dependent), returns it to the client, and the browser establishes a TCP connection to that IP. In an enterprise, I configure internal DNS zones for internal resources, forwarders to external DNS resolvers (Google 8.8.8.8 or Cloudflare 1.1.1.1), and conditional forwarders for partner domains. DNS is critical infrastructure — a DNS failure is effectively a total network outage for users, which is why I run at least two DNS servers with zone replication [4]."

4. What is your approach to backup and disaster recovery?

Expert Answer: "I design backup strategies using the 3-2-1 rule: 3 copies of data, on 2 different media types, with 1 copy offsite. For our environment: daily incremental backups to a local NAS (retention: 30 days), daily replication to an offsite DR location (retention: 90 days), and monthly full backup archived to cloud storage (AWS S3 Glacier, retention: 1 year). I define RPO (Recovery Point Objective) and RTO (Recovery Time Objective) for each system tier: Tier 1 (domain controllers, email, ERP) — RPO 1 hour, RTO 4 hours. Tier 2 (file servers, print servers) — RPO 4 hours, RTO 8 hours. Tier 3 (development, testing) — RPO 24 hours, RTO 24 hours. I use Veeam Backup & Replication for VM-level backups with application-aware processing for Exchange and SQL. Most importantly, I test restores monthly — a backup that can't be restored is not a backup. I also maintain a documented DR runbook with step-by-step recovery procedures for each Tier 1 system."

5. How do you secure a Windows Server environment?

Expert Answer: "I implement defense in depth across multiple layers. Identity: enforce MFA for all administrative accounts, implement tiered admin model (separate admin accounts for workstation, server, and domain admin), and disable default Administrator account. Access: implement least privilege through Role-Based Access Control (RBAC), use Group Policy to restrict local admin rights, and audit privileged access with PAM (Privileged Access Management). Network: segment the network with VLANs and firewall rules between tiers, restrict RDP access to jump servers only, and disable unnecessary services and ports. Endpoint: deploy EDR (Endpoint Detection and Response), configure Windows Defender Attack Surface Reduction rules, and enable controlled folder access for ransomware protection. Monitoring: forward security logs to SIEM (Splunk, Sentinel), configure alerts for failed login attempts, privilege escalation, and lateral movement indicators. Patch management: maintain a 14-day patch compliance window for critical updates. I also conduct quarterly vulnerability scans using Nessus and remediate findings within SLA [5]."

6. Explain the difference between RAID 1, RAID 5, and RAID 10, and when you would use each.

Expert Answer: "RAID 1 (mirroring) duplicates data across two disks — if one fails, the other has a complete copy. It provides excellent read performance and fast rebuild times but costs 50% of total capacity to redundancy. I use RAID 1 for OS drives and boot volumes where rebuild speed is critical. RAID 5 (striping with parity) distributes data and parity across three or more disks — it can tolerate a single disk failure and costs only one disk's capacity for redundancy. However, RAID 5 has slow write performance due to parity calculations, and rebuild times on large disks can take 12-24 hours, during which a second disk failure causes total data loss. I use RAID 5 for read-heavy, non-critical file storage. RAID 10 (mirrored stripe) combines RAID 1 and RAID 0 — data is mirrored in pairs, then striped across pairs. It provides the best read/write performance, tolerates one disk failure per mirror pair, and has fast rebuild times. It costs 50% capacity. I use RAID 10 for database servers and high-IOPS applications. In 2026, for new deployments, I increasingly recommend NVMe SSDs with RAID 10 for performance-critical workloads and cloud-based storage with provider-managed redundancy for everything else [4]."

7. How do you manage and automate tasks using PowerShell or scripting?

Expert Answer: "I use PowerShell for three categories of automation. Repetitive tasks: user onboarding scripts that create the AD account, assign group memberships, provision mailbox, assign O365 license, create home folder with proper NTFS permissions, and generate a welcome email — all from a single CSV input. What took 45 minutes per user manually now takes 2 minutes per user via script. Monitoring and reporting: scheduled scripts that check disk space, certificate expiration dates, AD replication health, and backup job status — results are emailed to me daily so I catch issues before users report them. Configuration compliance: DSC (Desired State Configuration) scripts that enforce server configurations — ensuring specific services are running, registry keys are set, and security baselines are maintained. All scripts are version-controlled in Git, documented with comment-based help, and peer-reviewed before production deployment. I follow PowerShell best practices: advanced functions with proper parameter validation, error handling with try/catch, and logging for troubleshooting [2]."

Situational Questions

1. A ransomware attack encrypts files on a shared network drive. Walk me through your response.

Expert Answer: "Immediate containment (first 30 minutes): identify the source machine by checking the file server's audit logs — the user account modifying/encrypting files reveals the infected endpoint. Isolate that endpoint from the network immediately (disable the network port, remove WiFi). Disable the user's AD account to prevent further spread. Check whether the ransomware has spread laterally by scanning for encryption activity on other file shares and endpoints. Eradication: once the infected endpoint is isolated, scan all endpoints with updated EDR signatures. Check for persistence mechanisms (scheduled tasks, registry run keys, WMI subscriptions). Recovery: restore encrypted files from the most recent clean backup — verify the backup is pre-infection by checking file timestamps against the attack timeline. Before restoring, ensure the ransomware has been fully removed to avoid re-infection. Post-incident: conduct a root cause analysis — how did the ransomware enter (phishing email? unpatched vulnerability? RDP exposure?), implement preventive measures (email filtering, patch management, endpoint protection), and run a simulated phishing exercise to improve user awareness [5]."

2. Management wants to migrate all servers to the cloud within 12 months. How do you plan the migration?

Expert Answer: "I'd execute a structured migration methodology. Phase 1 (month 1-2): inventory and assessment — document every server's role, dependencies, resource utilization, compliance requirements, and application compatibility. Categorize workloads using the 6 Rs: rehost (lift-and-shift), replatform (minor modifications), refactor (re-architect), repurchase (SaaS replacement), retire (decommission), or retain (stay on-prem). Phase 2 (month 3-4): architect the cloud environment — design VPCs, subnets, security groups, IAM policies, and network connectivity (VPN or Direct Connect to on-premises). Implement infrastructure-as-code using Terraform. Phase 3 (month 5-9): migrate in waves, starting with non-critical workloads (development, testing), then business applications, then core infrastructure. Each wave follows: prepare, migrate, test, cutover. Phase 4 (month 10-12): migrate remaining workloads, decommission on-premises hardware, optimize cloud costs (right-sizing, reserved instances). Throughout: maintain rollback capability until each workload is validated in production."

3. A user reports that the file server is slow. How do you diagnose the issue?

Expert Answer: "I'd investigate methodically across four dimensions. First, scope the problem: is it one user or many? One file share or all? Slow to open files, slow to save, or slow to browse? Second, check the server itself: CPU, RAM, disk I/O via Task Manager/Resource Monitor/Performance Monitor. Are disk queues high (> 2 per spindle)? Is memory committed beyond physical RAM (paging)? Is a process consuming excessive CPU? Third, check the network: ping the server from the affected workstation — is latency normal (< 1ms on LAN)? Are there packet errors or retransmissions? Is the user connected via a slow link (WiFi vs. wired, VPN)? Check the switch port for errors using show interface stats. Fourth, check the file share specifically: is antivirus scanning files on access and creating bottlenecks? Are there excessive open file handles from a process? Is DFS replication backlogged? I'd use Performance Monitor with disk, memory, network, and SMB counters to identify the bottleneck, then address the root cause."

4. You discover a rogue device on the network during a routine audit. What do you do?

Expert Answer: "First, identify the device: check the MAC address against our inventory, trace it to a switch port using show mac address-table and show cdp neighbors, and determine its physical location. Second, assess the risk: is it a personal device (employee's phone or laptop), an unauthorized access point, or potentially a malicious device? Check if it's communicating with external IPs or attempting lateral movement. Third, isolate: place the switch port in a quarantine VLAN or shut it down to prevent network access. Fourth, investigate: if it's an employee's personal device, address the policy violation with the employee and their manager. If it's potentially malicious, preserve the device for forensic analysis, escalate to the security team, and check for indicators of compromise on adjacent systems. Fifth, prevent recurrence: implement 802.1X port-based authentication so only authorized devices can connect to the network. Deploy a NAC (Network Access Control) solution that detects and quarantines unknown devices automatically [5]."

5. The company is growing from 100 to 300 employees in the next year. How do you scale the IT infrastructure?

Expert Answer: "I'd plan across four pillars. Identity and access: ensure Active Directory can handle 3x the user, computer, and group policy objects — evaluate whether our current DC hardware needs upgrading or if we should add additional domain controllers. Review our O365/M365 licensing tier and user provisioning automation. Network: assess current switch port capacity, WiFi AP density, and WAN bandwidth. 300 users likely require additional access switches, more WAPs (1 per 25-30 users), and a bandwidth upgrade for the internet circuit. Endpoint management: standardize hardware procurement (negotiate volume pricing), automate imaging and deployment (MDT/Autopilot), and implement Intune for MDM if we haven't already. Infrastructure services: evaluate whether our on-premises servers can handle 3x the load or whether this is the trigger for cloud migration for scalable workloads (email, file sharing, collaboration). I'd present a phased infrastructure plan with cost projections aligned to the hiring timeline."

Questions to Ask the Interviewer

1. What does the current server and cloud infrastructure look like? Determines the technical environment and modernization state you'll be working with.

2. How is the IT team structured, and how many systems administrators are on staff? Reveals your workload and whether you'll have support or be a one-person operation.

3. What is the change management process for production changes? Indicates operational maturity — formalized change control vs. "just do it."

4. What monitoring and alerting tools are in place? Determines whether you'll have visibility into infrastructure health or need to build monitoring from scratch.

5. What is the company's approach to cloud migration — are you cloud-first, hybrid, or on-premises? Directly impacts the skills you'll use daily and the trajectory of your role.

6. What is the on-call expectation for this position? Practical question about work-life balance and whether after-hours support is frequent or rare.

7. What are the biggest IT infrastructure challenges the organization is currently facing? Gives insight into the problems you'd be solving and whether they're interesting.

Interview Format and What to Expect

Systems administrator interviews typically include 2-3 rounds [3]. The first round is a phone screen (30 minutes) with HR or the hiring manager covering background, certifications, and salary expectations. The second round is a technical interview (60-90 minutes) with the IT manager or a senior sysadmin, involving deep-dive technical questions, troubleshooting scenarios, and potentially a hands-on lab exercise (configure a Group Policy, troubleshoot a DNS issue, write a PowerShell script). Some companies add a third round: a practical test where you're given a virtual environment with a set of tasks to complete within a time limit. The final conversation is typically with the IT director or CIO, focusing on strategic thinking and cultural fit. Bring a mental inventory of your infrastructure experience — server counts, user counts, technologies managed, and incident resolution examples.

How to Prepare

• Review core technologies. Active Directory, DNS, DHCP, Group Policy, RAID, backup/recovery, and virtualization (VMware/Hyper-V) are guaranteed topics [4].
• Know your command line. Be ready to demonstrate PowerShell, CMD, and basic Linux commands for common administrative tasks.
• Prepare troubleshooting stories. Have 3-5 detailed examples of server outages, performance issues, or security incidents you've resolved.
• Study cloud fundamentals. AWS, Azure, or GCP basics — VMs, networking, IAM, and storage — are increasingly expected [2].
• Practice automation examples. Have PowerShell or Bash scripts you've written and can explain. Automation is no longer optional.
• Review security practices. Ransomware response, patch management, access control, and vulnerability management are frequently tested [5].

Common Interview Mistakes

1. Only knowing one operating system. In 2026, sysadmins are expected to work across Windows and Linux, with cloud platform experience. Being Windows-only or Linux-only limits your candidacy [2].
2. Not demonstrating automation skills. Saying "I manage servers" without mentioning scripting, automation, or infrastructure-as-code suggests a manual-operations mindset that's increasingly outdated [3].
3. Ignoring security in answers. Every infrastructure question has a security dimension. Designing a file server without mentioning NTFS permissions, audit logging, or encryption signals a blind spot [5].
4. Failing to quantify your environment. "I managed servers" is vague. "I managed 45 Windows servers, 12 Linux servers, and 500 endpoints across 3 locations" gives the interviewer scale context.
5. Not knowing backup and DR practices. If you can't explain your backup strategy, RPO/RTO targets, and when you last tested a restore, you're missing a fundamental sysadmin competency.
6. Lacking cloud knowledge. The BLS notes that some sysadmin tasks are shifting to cloud and DevOps [1]. Not mentioning cloud experience or readiness is a competitive disadvantage.
7. Not asking about the environment. Failing to ask about infrastructure, team size, and on-call expectations suggests you'll accept any position without evaluating fit.

Key Takeaways

• Systems administrator interviews test both traditional infrastructure knowledge and modern cloud/automation skills.
• Prepare troubleshooting scenarios with specific technologies, diagnostic steps, and measurable outcomes.
• Automation (PowerShell, Ansible, Terraform) and cloud platform knowledge are increasingly expected, not optional.
• Security awareness should be woven into every answer — patching, access control, backup, and incident response.

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FAQ

What certifications are most valuable for systems administrator interviews?

CompTIA A+ and Network+ for entry-level positions. Microsoft Certified: Azure Administrator Associate and Windows Server Hybrid Administrator Associate for mid-level. AWS Solutions Architect Associate or Azure Solutions Architect Expert for cloud-focused roles. CompTIA Security+ is increasingly required as a baseline for all IT roles [4].

Is the systems administrator role being replaced by DevOps?

Not replaced, but evolving. The BLS projects a 4% decline in traditional sysadmin positions as routine tasks (monitoring, patching, provisioning) are automated or shifted to cloud-managed services [1]. However, 14,300 annual openings remain, and sysadmins who develop automation, cloud, and DevOps skills remain highly employable. The role is transforming from manual operations to infrastructure engineering.

What salary should I expect as a systems administrator?

The BLS reports a median of $96,800, with the 10th percentile at $58,600 and the top 10% earning over $150,320 [1]. Salary varies by location, industry, and specialization. Sysadmins in technology, finance, and healthcare earn premiums. Those with cloud certifications and automation skills command 15-25% above median.

Should I learn Linux as a Windows sysadmin?

Yes. Most cloud workloads run on Linux, and containerization (Docker, Kubernetes) is Linux-native. Even in Windows-heavy shops, you'll encounter Linux servers for web services, databases, and development tools. Proficiency in both platforms makes you significantly more versatile and hireable [2].

How important is scripting ability for a systems administrator?

Critical in 2026. PowerShell for Windows automation, Bash for Linux, and Python for cross-platform scripting are expected skills. Hiring managers increasingly view scripting as a core competency, not a bonus skill. Candidates who can demonstrate that they've automated repetitive tasks have a significant advantage in interviews [3].

What is the difference between a systems administrator and a systems engineer?

Systems administrators focus on day-to-day operations: managing user accounts, deploying patches, monitoring performance, and troubleshooting issues. Systems engineers focus on architecture and design: planning infrastructure, evaluating technologies, designing for scalability and redundancy, and leading migration projects. Engineers typically have more experience, higher compensation, and a more strategic focus. Career progression typically moves from admin to senior admin to systems engineer.

How do I transition from sysadmin to DevOps or cloud engineering?

Start by learning infrastructure-as-code (Terraform), configuration management (Ansible), containerization (Docker, Kubernetes), and CI/CD pipelines (GitHub Actions, Jenkins). Build projects that demonstrate these skills — automate your current infrastructure, deploy applications in containers, and manage cloud resources with code. Cloud certifications (AWS SAA, Azure Administrator) validate your knowledge. The transition is natural because sysadmins already understand the infrastructure that DevOps engineers automate.

Citations: [1] Bureau of Labor Statistics, "Network and Computer Systems Administrators: Occupational Outlook Handbook," https://www.bls.gov/ooh/computer-and-information-technology/network-and-computer-systems-administrators.htm [2] The Interview Guys, "System Administrator Interview Questions and Answers: How to Showcase Your Technical Skills (2025)," https://blog.theinterviewguys.com/system-administrator-interview-questions-and-answers/ [3] Indeed, "8 Systems Administrator Interview Questions [Updated 2026]," https://www.indeed.com/hire/interview-questions/systems-administrator [4] My Great Learning, "Top 45 System Admin Interview Questions 2025," https://www.mygreatlearning.com/blog/system-administration-interview-questions/ [5] CVOwl, "Top 20 System Administrator Interview Questions and Answers (Updated 2025)," https://www.cvowl.com/blog/system-administrator-interview-questions-answers [6] WahResume, "45+ Systems Administrator Interview Questions & Answers (2026)," https://www.wahresume.com/interview-questions/systems-administrator-interview [7] Teal HQ, "2025 System Administrator Interview Questions & Answers (Top Ranked)," https://www.tealhq.com/interview-questions/system-administrator [8] My Interview Practice, "Top 27 Systems Administrator Interview Questions [2025]," https://myinterviewpractice.com/industries-details/information-technology/systems-administrator-interview-preparation/