Top 25 Computer Networks MCQs With Answers 2024

1. Which layer of the OSI model is associated with error detection and correction?

A) Network Layer

B) Transport Layer

C) Data Link Layer

D) Application Layer

Answer: C) Data Link Layer

2. What is the primary function of a router?

A) To connect devices within the same network

B) To route data between different networks

C) To manage network traffic

D) To amplify signals

Answer: B) To route data between different networks

3. Which protocol is used to send email?

A) HTTP

B) FTP

C) SMTP

D) SNMP

Answer: C) SMTP

4. In which topology does each node connect to a central hub?

A) Star Topology

B) Bus Topology

C) Ring Topology

D) Mesh Topology

Answer: A) Star Topology

5. What does the acronym DHCP stand for?

A) Dynamic Host Configuration Protocol

B) Data Host Control Protocol

C) Direct Host Communication Protocol

D) Domain Host Control Protocol

Answer: A) Dynamic Host Configuration Protocol

6. Which of the following IP addresses is a private IP address?

A) 192.168.1.1

B) 172.16.0.1

C) 10.0.0.1

D) All of the above

Answer: D) All of the above

7. What is the maximum length of a CAT5e cable?

A) 50 meters

B) 100 meters

C) 200 meters

D) 300 meters

Answer: B) 100 meters

8. Which layer of the OSI model handles data encryption?

A) Physical Layer

B) Network Layer

C) Transport Layer

D) Presentation Layer

Answer: D) Presentation Layer

9. What is the main purpose of NAT (Network Address Translation)?

A) To secure data

B) To hide internal IP addresses

C) To manage bandwidth

D) To prioritize traffic

Answer: B) To hide internal IP addresses

10. Which protocol is used for secure file transfer?

A) FTP

B) SFTP

C) HTTP

D) Telnet

Answer: B) SFTP

11. What does SSL stand for?

A) Secure Socket Layer

B) Security System Layer

C) Simple Socket Layer

D) Secure System Layer

Answer: A) Secure Socket Layer

12. In a TCP/IP model, which layer is equivalent to the OSI's Transport Layer?

A) Internet Layer

B) Application Layer

C) Transport Layer

D) Network Access Layer

Answer: C) Transport Layer

13. Which device is used to connect different networks and filter traffic?

A) Switch

B) Hub

C) Router

D) Repeater

Answer: C) Router

14. What is the default subnet mask for a Class C IP address?

A) 255.0.0.0

B) 255.255.0.0

C) 255.255.255.0

D) 255.255.255.255

Answer: C) 255.255.255.0

15. Which of the following is a benefit of using a VPN?

A) Increased speed

B) Enhanced security

C) Reduced latency

D) Free Internet access

Answer: B) Enhanced security

16. What type of addressing uses MAC addresses?

A) Network Layer

B) Transport Layer

C) Data Link Layer

D) Application Layer

Answer: C) Data Link Layer

17. What is the main role of a firewall?

A) To speed up the network

B) To filter incoming and outgoing traffic

C) To increase network capacity

D) To connect different networks

Answer: B) To filter incoming and outgoing traffic

18. Which topology allows for the most redundancy?

A) Star

B) Ring

C) Mesh

D) Bus

Answer: C) Mesh

19. Which layer in the OSI model is responsible for establishing, managing, and terminating connections?

A) Session Layer

B) Transport Layer

C) Application Layer

D) Data Link Layer

Answer: A) Session Layer

20. What does the acronym WAN stand for?

A) Wide Area Network

B) Wireless Area Network

C) Wide Access Network

D) Web Area Network

Answer: A) Wide Area Network

21. Which of the following is a connection-oriented protocol?

A) UDP

B) IP

C) TCP

D) ICMP

Answer: C) TCP

22. What type of network uses a single central cable for all devices?

A) Star

B) Ring

C) Bus

D) Mesh

Answer: C) Bus

23. Which device operates at the OSI model's Network Layer?

A) Switch

B) Hub

C) Router

D) Repeater

Answer: C) Router

24. What is the purpose of ARP (Address Resolution Protocol)?

A) To translate IP addresses to MAC addresses

B) To resolve domain names to IP addresses

C) To route packets

D) To manage IP address allocation

Answer: A) To translate IP addresses to MAC addresses

25. Which command is used to test connectivity between two network devices?

A) ping

B) tracert

C) netstat

D) ipconfig

Answer: A) ping