computer and networking interview question quiz 2025

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Computer & Networking Interview Questions & Answers – 2025 Quiz (Detailed)

computer and networking interview question quiz 2025

Section 1: Basic Computer Knowledge

1. What is an Operating System (OS)?

Answer:computer and networking interview question quiz 2025

An Operating System is system software that manages computer hardware, software resources, and provides services for computer programs.
Examples: Windows 10/11, Linux, macOS.

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2. What is BIOS/UEFI?

Answer:

BIOS (Basic Input/Output System) and UEFI (Unified Extensible Firmware Interface) are firmware interfaces that initialize hardware components during boot and load the operating system.

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3. What is Virtual Memory?

Answer:

Virtual memory uses a portion of the hard disk (paging file) as additional RAM. When physical RAM is full, the system moves inactive data to disk storage to improve multitasking.

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4. What is a Device Driver?

Answer:

A driver is software that lets the OS communicate with hardware devices (printers, keyboards, GPUs, Wi-Fi cards).

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5. What is a File System? Name different types.

Answer:

A file system organizes data on storage devices.
Types: NTFS, FAT32, exFAT, EXT4, APFS.

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Section 2: Hardware & Troubleshooting

computer and networking interview question quiz 2025

6. What is the difference between SSD and HDD?

Answer:

• SSD: Faster, no moving parts, less heat, higher cost.
• HDD: Slower, mechanical parts, cheaper, good for large storage.

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7. What is the purpose of thermal paste?

Answer:

It improves heat transfer between the CPU and the heat sink for efficient cooling.

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8. What is POST?

Answer:

POST (Power-On Self Test) checks hardware at startup and ensures everything is functioning before loading the OS.

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9. A computer is overheating. What are possible causes?

Answer:

• Dust buildup
• Faulty fan
• No thermal paste
• Blocked airflow
• High CPU usage
• Malware

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10. What is Overclocking?

Answer:

Increasing the CPU/GPU clock speed beyond default to boost performance, often increasing heat and power usage.

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Section 3: Networking Basics

computer and networking interview question quiz 2025

11. What is a Network?

Answer:

A network is a collection of interconnected devices that share data and resources.

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12. What is an IP Address?

Answer:

An IP address uniquely identifies a device on a network.
Types: IPv4 (32-bit), IPv6 (128-bit).

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13. What is DHCP?

Answer:

DHCP (Dynamic Host Configuration Protocol) automatically assigns IP addresses to devices in a network.

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14. What is DNS?

Answer:

DNS (Domain Name System) converts domain names (google.com) into IP addresses.

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15. What is a MAC Address?

Answer:

A MAC (Media Access Control) address is a unique hardware identifier for network interface cards.

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Section 4: Networking Devices

computer and networking interview question quiz 2025

16. What is a Router?

Answer:

A router connects multiple networks and forwards data packets between them.

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17. What is a Switch?

Answer:

A switch connects devices within the same network (LAN) and uses MAC addresses to forward data.

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18. What is a Hub?

Answer:

A hub broadcasts data to all ports without filtering, causing more collisions and lower security.

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19. Difference between Router & Switch.

Answer:

Router	Switch
Connects networks	Connects devices in one network
Uses IP addresses	Uses MAC addresses
More intelligent	Less intelligent

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20. What is a Firewall?

Answer:

A firewall is a security device or software that filters incoming and outgoing traffic to prevent unauthorized access.

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Section 5: Network Concepts

computer and networking interview question quiz 2025

21. What is LAN, WAN, MAN?

Answer:

• LAN: Small area (office/home)
• MAN: Metropolitan area
• WAN: Wide geographical area (Internet)

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22. What is Bandwidth?

Answer:

The maximum data transfer rate of a network connection measured in Mbps or Gbps.

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23. What is Latency?

Answer:

The delay between sending and receiving data in a network (measured in milliseconds).

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24. What is a Subnet Mask?

Answer:

A subnet mask divides an IP network into smaller sub-networks.

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25. What is Port Number?

Answer:

A port identifies the type of network service.
Examples:

• 80: HTTP
• 443: HTTPS
• 21: FTP
• 53: DNS

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Section 6: Wireless Networking

computer and networking interview question quiz 2025

26. What is Wi-Fi 6 / Wi-Fi 6E?

Answer:

Latest wireless standards offering higher speed, lower latency, and improved performance.

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27. What is SSID?

Answer:

SSID (Service Set Identifier) is the name of a Wi-Fi network.

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28. What is WPS?

Answer:

Wi-Fi Protected Setup allows easy device connection without entering a password.

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29. What is Hotspot?

Answer:

A hotspot shares internet from one device to others wirelessly.

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30. What is Encryption?

Answer:

Process of securing data by converting it into unreadable format.
Types: WPA2, WPA3.

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Section 7: Network Troubleshooting (2025)

computer and networking interview question quiz 2025

31. What is Ping?

Answer:

A command used to test network connectivity and latency.

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32. What is Traceroute?

Answer:

A tool to trace the path data takes to reach a destination.

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33. What is Packet Loss?

Answer:

When data packets fail to reach destination due to congestion or hardware issues.

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34. Wi-Fi connected but no internet. What are causes?

Answer:

• DNS failure
• ISP issue
• Router failure
• Incorrect IP
• Firewall block

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35. What is Loopback Address?

Answer:127.0.0.1

– Used to test internal network functions.

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Section 8: Security & Cyber Concepts

36. What is Phishing?

Answer:

A cyberattack where attackers trick users into revealing personal data.

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37. What is Malware?

Answer:

Malicious software designed to damage or gain unauthorized access.

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38. What is VPN?

Answer:

VPN (Virtual Private Network) encrypts traffic and hides user identity online.

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39. What is HTTPS?

Answer:

HTTPS is secure HTTP using SSL/TLS encryption for safe browsing.

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40. What is Two-Factor Authentication (2FA)?

Answer:

A security process requiring two verification methods (password + OTP).

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Section 9: Advanced Networking (2025)

41. What is Cloud Computing?

Answer:

Cloud computing delivers computing resources over the internet.
Types: IaaS, PaaS, SaaS.

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42. What is Virtualization?

Answer:

Running multiple virtual machines on a single physical machine.

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43. What is SDN (Software Defined Networking)?

Answer:

SDN separates network control from hardware for flexible management.

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44. What is Zero Trust Security?

Answer:

A model where no device/user is trusted by default.

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45. What is IoT Networking?

Answer:

Connecting smart devices (CCTV, sensors, home automation) to the internet.

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Section 10: Bonus Interview Questions (Quick Fire)

46. What is a Proxy Server?

Acts as an intermediate between client and internet.

47. What is NAT?

Network Address Translation converts private IPs to public IPs.

48. What is VLAN?

Virtual LAN divides a network into logical segments.

49. What is SSH?

Secure remote access protocol for servers.

50. What is Cloud Storage?

Online storage service (Google Drive, OneDrive, AWS S3).

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