9th class Computer Science and Entrepreneurship, Chapter 3: Computer Networks MCQs

1. The primary objective of computer network is:

1. (A) Increase computational power
2. (B) Enable resource sharing and data communication ✓
3. (C) Enhance graphic capabilities
4. (D) Improve software development

2. Which device is used to connect multiple networks and direct data packets between them?

1. (A) Switch
2. (B) Hub
3. (C) Router ✓
4. (D) Modem

3. Which layer of the OSI model is responsible for node-to-node data transfer and error detection?

1. (A) Physical Layer
2. (B) Data Link Layer ✓
3. (C) Network Layer
4. (D) Transport Layer

4. The function of the Domain Name System (DNS) is to:

1. (A) Assign IP addresses dynamically
2. (B) Translate domain names to IP addresses ✓
3. (C) Secure data communication
4. (D) Monitor network traffic

5. Which method of data transmission uses a dedicated communication path?

1. (A) Packet Switching
2. (B) Circuit Switching ✓
3. (C) Full-Duplex
4. (D) Half-Duplex

6. Which protocol is used for reliable data transfer in the TCP/IP model?

1. (A) HTTP
2. (B) FTP
3. (C) TCP ✓
4. (D) UDP

7. The main purpose of a Firewall in network security is to:

1. (A) Convert data into a secure format
2. (B) Monitor and control network traffic ✓
3. (C) Assign IP addresses
4. (D) Translate domain names

8. Which network topology connects all devices to a central hub?

1. (A) Ring
2. (B) Mesh
3. (C) Bus
4. (D) Star ✓

9. What is a key benefit of using computer networks in business?

1. (A) Increase computational power
2. (B) Enable resource sharing and efficient communication ✓
3. (C) Enhance graphic capabilities
4. (D) Improve software development

10. ______ is a system of interconnected computers and devices to share information and resources.

1. (A) Software
2. (B) Processor
3. (C) Database
4. (D) Network ✓

11. The minimum number of computers required to form a computer network is:

1. (A) Two ✓
2. (B) Three
3. (C) Four
4. (D) Many

12. What is the main objective of computer networks?

1. (A) Play games
2. (B) Print posters
3. (C) Share resources ✓
4. (D) Watch films

13. Which of the following is NOT a node in a computer network?

1. (A) Smartphone
2. (B) Router
3. (C) Ethernet cable ✓
4. (D) Printer

14. What type of connection is Ethernet?

1. (A) Wireless
2. (B) Virtual
3. (C) Optical
4. (D) Wired ✓

15. What type of connection is Wi-Fi?

1. (A) Wired
2. (B) Wireless ✓
3. (C) Internal
4. (D) Satellite

16. Which device connects different networks and directs data packets between them?

1. (A) Switch
2. (B) Router ✓
3. (C) Access Point
4. (D) Repeater

17. Which device is like a "traffic director" for data on the Internet?

1. (A) Switch
2. (B) Router ✓
3. (C) Hub
4. (D) Modem

18. Which of these devices connects multiple nodes and helps them communicate within a network?

1. (A) Browser
2. (B) Firewall
3. (C) Switch ✓
4. (D) Monitor

19. What is the largest network in the world?

1. (A) LAN
2. (B) Intranet
3. (C) Internet ✓
4. (D) MAN

20. Which of the following is NOT a data communication service?

1. (A) Email
2. (B) Instant messaging
3. (C) Video conferencing
4. (D) Telegraph ✓