Computer Networks MCQs for NTS, CSS, PMS, KPPSC, PPSC, ETEA, SPSC, BPSC, and FPSC Tests

For high-level competitive exams like CSS, PMS, and the FPSC screening test, a deep understanding of Computer Networks is crucial. This set of 20 multiple-choice questions (MCQs) covers fundamental concepts like the OSI model, TCP/IP, and networking protocols to help you excel in your examination.

1. How many layers are in the OSI (Open Systems Interconnection) model?

• 5
• 6
• 7
• 8

Answer: 7

2. Which layer of the OSI model is responsible for routing packets?

• Physical Layer
• Data Link Layer
• Network Layer
• Transport Layer

Answer: Network Layer

3. What is the full form of TCP/IP?

• Transmission Control Protocol/Internet Protocol
• Technical Control Protocol/Internet Protocol
• Transmission Connection Protocol/Internet Protocol
• Transfer Control Protocol/Internet Protocol

Answer: Transmission Control Protocol/Internet Protocol

4. A device that connects two or more different networks is a...?

• Hub
• Switch
• Router
• Repeater

Answer: Router

5. Which of the following is a standard for Wi-Fi?

• IEEE 802.3
• IEEE 802.11
• IEEE 802.1
• IEEE 802.5

Answer: IEEE 802.11

6. The physical address of a computer on a network is called the...?

• IP Address
• MAC Address
• Port Address
• Logical Address

Answer: MAC Address

7. Which protocol is used to send emails?

• FTP
• HTTP
• SMTP
• POP3

Answer: SMTP (Simple Mail Transfer Protocol)

8. In which network topology is every node connected to a central hub?

• Bus Topology
• Ring Topology
• Star Topology
• Mesh Topology

Answer: Star Topology

9. What does DNS stand for?

• Domain Name System
• Digital Name Service
• Domain Naming Standard
• Dynamic Name System

Answer: Domain Name System

10. The Data Link Layer is responsible for...?

• Process-to-process delivery
• Hop-to-hop delivery
• Node-to-node delivery
• End-to-end delivery

Answer: Node-to-node delivery

11. Which of the following is an unguided transmission medium?

• Coaxial Cable
• Fiber Optic Cable
• Twisted Pair Cable
• Microwaves

Answer: Microwaves

12. The IP address 127.0.0.1 is known as the...?

• Gateway Address
• Broadcast Address
• Loopback Address
• Subnet Mask

Answer: Loopback Address

13. Which layer of the OSI model handles data compression and encryption?

• Application Layer
• Presentation Layer
• Session Layer
• Transport Layer

Answer: Presentation Layer

14. What is the main function of a Switch?

• To broadcast data to all devices
• To forward data to a specific device on the network
• To connect different networks
• To regenerate a weak signal

Answer: To forward data to a specific device on the network

15. HTTP, FTP, and SMTP are protocols of which layer?

• Network Layer
• Transport Layer
• Session Layer
• Application Layer

Answer: Application Layer

16. A set of rules that governs data communication is called a...?

• Standard
• Protocol
• Forum
• Connection

Answer: Protocol

17. Which device operates at the Physical Layer of the OSI model?

• Switch
• Router
• Bridge
• Hub

Answer: Hub

18. The process of converting digital data into an analog signal is called...?

• Modulation
• Demodulation
• Encoding
• Decoding

Answer: Modulation

19. What is the purpose of a firewall?

• To speed up internet connection
• To filter network traffic and block unauthorized access
• To store frequently accessed web pages
• To resolve domain names to IP addresses

Answer: To filter network traffic and block unauthorized access

20. Which protocol provides a connection-oriented reliable service?

• TCP
• UDP
• IP
• ICMP

Answer: TCP (Transmission Control Protocol)