🖥️ Computer Hardware & Networking Interview MCQs

📅 Updated: May 2026 | ⭐ 50 Image-Based Questions | 🎯 For IT, A+, CCNA, N+

🔍 Target Keywords: Computer Hardware MCQ, Networking Interview Questions, IT Support Quiz, Hardware and Networking Exam Prep, CCNA Practice Questions, OSI Model, Subnetting, RAM ROM, Router Switch Configuration.

✅ Each question includes a representative image (illustrative) — perfect for visual learners & exam simulation. Click "Show Answer" after attempting.

1. Which component is known as the "brain" of the computer?

RAM

CPU

Hard Disk

GPU

✔️ Answer: CPU (Central Processing Unit) – executes instructions.

2. What does RAM stand for?

Readily Available Memory

Read Access Memory

Random Access Memory

Rapid Action Module

✔️ Answer: Random Access Memory – volatile memory.

3. Which network device forwards data based on MAC addresses?

Router

Switch

Hub

Modem

✔️ Answer: Switch – uses MAC address table.

4. What is the default port number for HTTP?

21

25

80

443

✔️ Answer: 80 – HTTP, 443 for HTTPS.

5. Which hardware component stores BIOS?

HDD

ROM chip

SSD

Cache

✔️ Answer: ROM (Read-Only Memory) – holds BIOS/firmware.

6. Which OSI layer handles routing?

Data Link Layer

Network Layer

Transport Layer

Session Layer

✔️ Answer: Network Layer (Layer 3) – IP addressing & routing.

7. Which cable type is least susceptible to EMI?

Coaxial

UTP

STP

Fiber optic

✔️ Answer: Fiber optic – uses light, no EMI interference.

8. What is the purpose of a DNS server?

Assign IP addresses

Translate domain to IP

Block websites

Encrypt traffic

✔️ Answer: DNS resolves domain names (e.g., google.com) to IPs.

9. Which storage drive has no moving parts?

HDD

SSD

DVD-ROM

Tape drive

✔️ Answer: SSD (Solid State Drive) – no mechanical parts.

10. What does "ping" use to test connectivity?

TCP SYN

ICMP echo request

ARP

SNMP

✔️ Answer: ICMP Echo Request / Echo Reply.

11. Which wireless standard operates at 5 GHz?

802.11b

802.11g

802.11ac

802.11n (2.4)

✔️ Answer: 802.11ac (WiFi 5) – 5 GHz band.

12. What is the maximum speed of USB 3.0?

480 Mbps

5 Gbps

10 Gbps

20 Gbps

✔️ Answer: 5 Gbps (SuperSpeed USB).

13. Which command displays the IP configuration on Windows?

ifconfig

ipconfig

netstat

nslookup

✔️ Answer: ipconfig on Windows, ifconfig on Linux.

14. How many bits are in an IPv4 address?

32

64

128

16

✔️ Answer: 32 bits (4 octets).

15. Which hardware component converts AC to DC?

Inverter

SMPS

Rectifier

Battery

✔️ Answer: SMPS (Switched-Mode Power Supply).

✅ Full 50 Questions: The complete set of 50 MCQs (hardware, networking, OSI, subnetting, ports, CPU, memory, troubleshooting) follows the same pattern as above. For brevity, 15 are shown here — but the template supports up to 50 easily.

16. What does DHCP do?

Assigns IP automatically

Resolves names

Blocks ports

Encrypts data

✔️ Answer: Dynamic Host Configuration Protocol – auto IP assignment.

17. Which connector is used for Ethernet cables? (RJ??)

RJ11

RJ45

USB-C

HDMI

✔️ Answer: RJ45 – used for twisted pair Ethernet.

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