Computer Networks MCQs - 30 Multiple Choice Questions
1. What is the main function of a router?
A) Connects different networks
B) Connects devices within the same network
C) Stores data
D) Provides network security
Answer: A
A) Connects different networks
B) Connects devices within the same network
C) Stores data
D) Provides network security
Answer: A
2. Which protocol is used to send emails?
A) FTP
B) SMTP
C) HTTP
D) SNMP
Answer: B
A) FTP
B) SMTP
C) HTTP
D) SNMP
Answer: B
3. What layer of the OSI model does the TCP protocol operate at?
A) Application
B) Transport
C) Network
D) Data Link
Answer: B
A) Application
B) Transport
C) Network
D) Data Link
Answer: B
4. Which device is used to connect multiple devices in a LAN?
A) Router
B) Switch
C) Hub
D) Repeater
Answer: B
A) Router
B) Switch
C) Hub
D) Repeater
Answer: B
5. What does DHCP stand for?
A) Dynamic Host Configuration Protocol
B) Direct Host Communication Protocol
C) Dynamic Hypertext Configuration Protocol
D) Data Host Configuration Protocol
Answer: A
A) Dynamic Host Configuration Protocol
B) Direct Host Communication Protocol
C) Dynamic Hypertext Configuration Protocol
D) Data Host Configuration Protocol
Answer: A
6. Which of the following is a private IP address?
A) 192.168.1.1
B) 172.15.0.1
C) 10.0.0.1
D) All of the above
Answer: D
A) 192.168.1.1
B) 172.15.0.1
C) 10.0.0.1
D) All of the above
Answer: D
7. What is the purpose of the subnet mask?
A) To define the size of the network
B) To convert IP addresses to MAC addresses
C) To provide security to the network
D) To determine the default gateway
Answer: A
A) To define the size of the network
B) To convert IP addresses to MAC addresses
C) To provide security to the network
D) To determine the default gateway
Answer: A
8. Which layer of the OSI model is responsible for error detection and correction?
A) Application
B) Transport
C) Data Link
D) Network
Answer: C
A) Application
B) Transport
C) Data Link
D) Network
Answer: C
9. What does NAT stand for?
A) Network Address Translation
B) Network Access Technology
C) Network Application Transfer
D) None of the above
Answer: A
A) Network Address Translation
B) Network Access Technology
C) Network Application Transfer
D) None of the above
Answer: A
10. Which protocol is used for secure data transmission over the internet?
A) HTTP
B) HTTPS
C) FTP
D) SNTP
Answer: B
A) HTTP
B) HTTPS
C) FTP
D) SNTP
Answer: B
11. What is the function of a firewall?
A) To filter incoming and outgoing network traffic
B) To speed up network connections
C) To connect different networks
D) To assign IP addresses
Answer: A
A) To filter incoming and outgoing network traffic
B) To speed up network connections
C) To connect different networks
D) To assign IP addresses
Answer: A
12. Which of the following is NOT a type of network topology?
A) Star
B) Ring
C) Grid
D) Bus
Answer: C
A) Star
B) Ring
C) Grid
D) Bus
Answer: C
13. What does VPN stand for?
A) Virtual Private Network
B) Very Private Network
C) Virtual Protected Network
D) Variable Private Network
Answer: A
A) Virtual Private Network
B) Very Private Network
C) Virtual Protected Network
D) Variable Private Network
Answer: A
14. What is the main purpose of the OSI model?
A) To provide a framework for network communications
B) To standardize IP addressing
C) To define hardware components
D) To manage network devices
Answer: A
A) To provide a framework for network communications
B) To standardize IP addressing
C) To define hardware components
D) To manage network devices
Answer: A
15. Which protocol is used for file transfer?
A) SMTP
B) FTP
C) DHCP
D) ICMP
Answer: B
A) SMTP
B) FTP
C) DHCP
D) ICMP
Answer: B
16. What is the maximum length of a CAT5 Ethernet cable?
A) 50 meters
B) 100 meters
C) 150 meters
D) 200 meters
Answer: B
A) 50 meters
B) 100 meters
C) 150 meters
D) 200 meters
Answer: B
17. Which type of attack involves overwhelming a network with traffic?
A) Phishing
B) DoS attack
C) Man-in-the-middle
D) SQL injection
Answer: B
A) Phishing
B) DoS attack
C) Man-in-the-middle
D) SQL injection
Answer: B
18. Which layer of the OSI model deals with routing?
A) Data Link
B) Network
C) Transport
D) Application
Answer: B
A) Data Link
B) Network
C) Transport
D) Application
Answer: B
19. What is the primary purpose of the ARP protocol?
A) To convert IP addresses to MAC addresses
B) To manage network traffic
C) To secure network communication
D) To assign IP addresses
Answer: A
A) To convert IP addresses to MAC addresses
B) To manage network traffic
C) To secure network communication
D) To assign IP addresses
Answer: A
20. What does the term “latency” refer to in networking?
A) The amount of data transferred
B) The delay before data starts to transfer
C) The speed of the connection
D) The security of the connection
Answer: B
A) The amount of data transferred
B) The delay before data starts to transfer
C) The speed of the connection
D) The security of the connection
Answer: B
21. Which of the following is a connection-oriented protocol?
A) UDP
B) TCP
C) ICMP
D) ARP
Answer: B
A) UDP
B) TCP
C) ICMP
D) ARP
Answer: B
22. What is a VPN primarily used for?
A) Improving network speed
B) Encrypting data for secure communication
C) Monitoring network traffic
D) Providing static IP addresses
Answer: B
A) Improving network speed
B) Encrypting data for secure communication
C) Monitoring network traffic
D) Providing static IP addresses
Answer: B
23. What does a proxy server do?
A) Increases internet speed
B) Acts as an intermediary for requests from clients seeking resources
C) Provides IP addresses
D) Connects two different networks
Answer: B
A) Increases internet speed
B) Acts as an intermediary for requests from clients seeking resources
C) Provides IP addresses
D) Connects two different networks
Answer: B
24. What is the primary function of the Network layer in the OSI model?
A) Error detection
B) Path determination and logical addressing
C) Data formatting
D) Application services
Answer: B
A) Error detection
B) Path determination and logical addressing
C) Data formatting
D) Application services
Answer: B
25. Which of the following is a disadvantage of wireless networks?
A) Mobility
B) Interference and security vulnerabilities
C) Ease of installation
D) Scalability
Answer: B
A) Mobility
B) Interference and security vulnerabilities
C) Ease of installation
D) Scalability
Answer: B
26. What is the role of the DNS in networking?
A) To assign IP addresses
B) To resolve domain names to IP addresses
C) To secure network communications
D) To route packets
Answer: B
A) To assign IP addresses
B) To resolve domain names to IP addresses
C) To secure network communications
D) To route packets
Answer: B
27. What does the term “bandwidth” refer to?
A) The amount of data that can be transmitted in a fixed amount of time
B) The physical distance a signal can travel
C) The latency of a connection
D) The security level of a connection
Answer: A
A) The amount of data that can be transmitted in a fixed amount of time
B) The physical distance a signal can travel
C) The latency of a connection
D) The security level of a connection
Answer: A
28. Which protocol is used to resolve IP addresses to MAC addresses?
A) RARP
B) ARP
C) DHCP
D) DNS
Answer: B
A) RARP
B) ARP
C) DHCP
D) DNS
Answer: B
29. What is the maximum number of hosts in a Class C network?
A) 254
B) 256
C) 512
D) 1024
Answer: A
A) 254
B) 256
C) 512
D) 1024
Answer: A
30. What is the purpose of ICMP in networking?
A) To provide error messages and operational information
B) To establish connections
C) To manage data transfer
D) To encrypt data
Answer: A
A) To provide error messages and operational information
B) To establish connections
C) To manage data transfer
D) To encrypt data
Answer: A
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