COMPUTER NETWORK MCQS
1. Which layer of the OSI model is responsible for routing and addressing?
- A. Data Link
- B. Network
- C. Transport
- D. Physical
- **Answer: B. Network**
2. What is the primary function of ARP (Address Resolution Protocol)?
- A. To translate IP addresses to MAC addresses
- B. To translate domain names to IP addresses
- C. To establish a secure connection between two hosts
- D. To manage network traffic congestion
- **Answer: A. To translate IP addresses to MAC addresses**
3. What is the purpose of DNS (Domain Name System) in computer networks?
- A. To convert IP addresses to domain names
- B. To manage network security protocols
- C. To regulate data flow between devices
- D. To manage network hardware resources
- **Answer: A. To convert IP addresses to domain names**
4. Which protocol is used to securely transfer files over a network?
- A. FTP (File Transfer Protocol)
- B. HTTP (Hypertext Transfer Protocol)
- C. SMTP (Simple Mail Transfer Protocol)
- D. SNMP (Simple Network Management Protocol)
- **Answer: A. FTP (File Transfer Protocol)**
5. Which device forwards data packets between different networks?
- A. Hub
- B. Switch
- C. Router
- D. Repeater
- **Answer: C. Router**
6. What is the purpose of subnetting in networking?
- A. To reduce network traffic
- B. To create smaller, more manageable networks
- C. To increase network speed
- D. To secure network connections
- **Answer: B. To create smaller, more manageable networks**
7. Which protocol is used for sending and receiving emails?
- A. TCP (Transmission Control Protocol)
- B. UDP (User Datagram Protocol)
- C. SMTP (Simple Mail Transfer Protocol)
- D. HTTP (Hypertext Transfer Protocol)
- **Answer: C. SMTP (Simple Mail Transfer Protocol)**
8. What is the function of a firewall in a computer network?
- A. To prevent unauthorized access to the network
- B. To boost network speed
- C. To manage IP addresses
- D. To encrypt data transmission
- **Answer: A. To prevent unauthorized access to the network**
9. Which of the following is a reliable transport protocol in TCP/IP?
- A. TCP (Transmission Control Protocol)
- B. UDP (User Datagram Protocol)
- C. IP (Internet Protocol)
- D. ARP (Address Resolution Protocol)
- **Answer: A. TCP (Transmission Control Protocol)**
10. What is the purpose of NAT (Network Address Translation)?
- A. To map public IP addresses to private IP addresses
- B. To establish secure connections between networks
- C. To manage network traffic flow
- D. To encrypt data packets
- **Answer: A. To map public IP addresses to private IP addresses**
11. Which network topology connects all devices in a closed loop?
- A. Star
- B. Ring
- C. Bus
- D. Mesh
- **Answer: B. Ring**
12. What is the function of DHCP (Dynamic Host Configuration Protocol) in networking?
- A. To assign IP addresses to devices automatically
- B. To manage domain name registrations
- C. To encrypt data transmission
- D. To regulate network traffic
- **Answer: A. To assign IP addresses to devices automatically**
13. Which addressing scheme is used in IPv6?
- A. 32-bit
- B. 128-bit
- C. 64-bit
- D. 16-bit
- **Answer: B. 128-bit**
14. What is the purpose of ICMP (Internet Control Message Protocol) in networking?
- A. To send error messages and operational information
- B. To establish secure connections
- C. To manage network hardware resources
- D. To regulate network traffic flow
- **Answer: A. To send error messages and operational information**
15. Which network device operates at the Data Link layer of the OSI model?
- A. Hub
- B. Router
- C. Switch
- D. Bridge
- **Answer: C. Switch**
16. What is the role of SSL (Secure Sockets Layer) in network communication?
- A. To encrypt data transmission
- B. To manage network security policies
- C. To translate domain names to IP addresses
- D. To regulate network traffic flow
- **Answer: A. To encrypt data transmission**
17. Which protocol is used for secure remote login to a network device?
- A. FTP
- B. SSH (Secure Shell)
- C. Telnet
- D. SMTP
- **Answer: B. SSH (Secure Shell)**
18. What is the purpose of VLANs (Virtual Local Area Networks)?
- A. To connect geographically dispersed networks
- B. To divide a physical network into multiple logical networks
- C. To manage network hardware resources
- D. To encrypt data transmission
- **Answer: B. To divide a physical network into multiple logical networks**
19. Which protocol is used for real-time communication over the internet?
- A. HTTP
- B. FTP
- C. RTP (Real-time Transport Protocol)
- D. SNMP
- **Answer: C. RTP (Real-time Transport Protocol)**
20. What is the function of a proxy server in a computer network?
- A. To regulate network traffic flow
- B. To manage network security policies
- C. To translate domain names to IP addresses
- D. To act as an intermediary between clients and servers
- **Answer: D. To act as an intermediary between clients and servers**
21. Which protocol is used for web page retrieval?
- A. FTP
- B. HTTP
- C. SMTP
- D. SNMP
- **Answer: B. HTTP**
22. What is the purpose of QoS (Quality of Service) in networking?
- A. To increase network speed
- B. To manage network traffic priorities
- C. To encrypt data transmission
- D. To regulate network security policies
- **Answer: B. To manage network traffic priorities**
23. Which device connects multiple network segments and operates at the Data Link layer?
- A. Router
- B. Switch
- C. Hub
- D. Bridge
- **Answer: D. Bridge**
24. What is the role of a MAC address in networking?
- A. To uniquely identify a device on a network
- B. To translate domain names to IP addresses
- C. To manage network security policies
-
25. What is the function of ICMP (Internet Control Message Protocol) in networking?
- A. To send error messages and operational information
- B. To establish secure connections
- C. To manage network hardware resources
- D. To regulate network traffic flow
- **Answer: A. To send error messages and operational information**
26. Which protocol is used for secure remote login to a network device?
- A. FTP
- B. SSH (Secure Shell)
- C. Telnet
- D. SMTP
- **Answer: B. SSH (Secure Shell)**
27. What is the purpose of VLANs (Virtual Local Area Networks)?
- A. To connect geographically dispersed networks
- B. To divide a physical network into multiple logical networks
- C. To manage network hardware resources
- D. To encrypt data transmission
- **Answer: B. To divide a physical network into multiple logical networks**
28. Which protocol is used for real-time communication over the internet?
- A. HTTP
- B. FTP
- C. RTP (Real-time Transport Protocol)
- D. SNMP
- **Answer: C. RTP (Real-time Transport Protocol)**
29. What is the function of a proxy server in a computer network?
- A. To regulate network traffic flow
- B. To manage network security policies
- C. To translate domain names to IP addresses
- D. To act as an intermediary between clients and servers
- **Answer: D. To act as an intermediary between clients and servers**
30. Which protocol is used for web page retrieval?
- A. FTP
- B. HTTP
- C. SMTP
- D. SNMP
- **Answer: B. HTTP**
31. What is the purpose of QoS (Quality of Service) in networking?
- A. To increase network speed
- B. To manage network traffic priorities
- C. To encrypt data transmission
- D. To regulate network security policies
- **Answer: B. To manage network traffic priorities**
32. Which device connects multiple network segments and operates at the Data Link layer?
- A. Router
- B. Switch
- C. Hub
- D. Bridge
- **Answer: D. Bridge**
33. What is the role of a MAC address in networking?
- A. To uniquely identify a device on a network
- B. To translate domain names to IP addresses
- C. To manage network security policies
- D. To regulate network traffic flow
- **Answer: A. To uniquely identify a device on a network**
34. Which of the following is a characteristic of UDP (User Datagram Protocol)?
- A. Connection-oriented protocol
- B. Reliable data transmission
- C. Error checking and retransmission of lost packets
- D. Best-effort delivery
- **Answer: D. Best-effort delivery**
35. What is the purpose of NAT (Network Address Translation) in networking?
- A. To assign IP addresses to devices automatically
- B. To translate public IP addresses to private IP addresses
- C. To manage network security policies
- D. To regulate network traffic flow
- **Answer: B. To translate public IP addresses to private IP addresses**
36. Which protocol is responsible for converting domain names to IP addresses?
- A. DNS (Domain Name System)
- B. DHCP (Dynamic Host Configuration Protocol)
- C. ARP (Address Resolution Protocol)
- D. ICMP (Internet Control Message Protocol)
- **Answer: A. DNS (Domain Name System)**
37. What is the purpose of a MAC table in a switch?
- A. To store IP addresses of devices connected to the switch
- B. To manage routing tables
- C. To store MAC addresses and associated port numbers
- D. To encrypt data transmission
- **Answer: C. To store MAC addresses and associated port numbers**
38. Which network device operates at the Physical layer of the OSI model?
- A. Router
- B. Switch
- C. Hub
- D. Repeater
- **Answer: D. Repeater**
39. What is the primary function of a DNS server?
- A. To manage IP addresses
- B. To assign IP addresses to devices automatically
- C. To translate domain names to IP addresses
- D. To establish secure connections between networks
- **Answer: C. To translate domain names to IP addresses**
40. Which protocol is used for transferring files securely over a network?
- A. FTPS (File Transfer Protocol Secure)
- B. SMTP (Simple Mail Transfer Protocol)
- C. SNMP (Simple Network Management Protocol)
- D. POP3 (Post Office Protocol version 3)
- **Answer: A. FTPS (File Transfer Protocol Secure)**
41. What is the purpose of a subnet mask in IP addressing?
- A. To identify the network portion of an IP address
- B. To identify the host portion of an IP address
- C. To determine the default gateway
- D. To regulate network traffic flow
- **Answer: A. To identify the network portion of an IP address**
42. Which protocol is used for dynamically assigning IP addresses to devices on a network?
- A. TCP (Transmission Control Protocol)
- B. DNS (Domain Name System)
- C. DHCP (Dynamic Host Configuration Protocol)
- D. FTP (File Transfer Protocol)
- **Answer: C. DHCP (Dynamic Host Configuration Protocol)**
43. What is the role of a firewall in network security?
- A. To connect multiple networks together
- B. To regulate network traffic flow
- C. To manage IP addresses
- D. To translate domain names to IP addresses
- **Answer: B. To regulate network traffic flow**
44. Which network topology connects all devices to a central hub or switch?
- A. Ring
- B. Bus
- C. Star
- D. Mesh
- **Answer: C. Star**
45. What is the function of SSL/TLS in network communication?
- A. To establish secure connections
- B. To manage network hardware resources
- C. To translate domain names to IP addresses
- D. To regulate network traffic flow
- **Answer: A. To establish secure connections**
46. Which of the following is a characteristic of a hub?
- A. Operates at the Network layer of the OSI model
- B. Forwards data packets based on MAC addresses
- C. Provides collision detection and prevention
- D. Creates multiple collision domains
- **Answer: D. Creates multiple collision domains**
47. What is the purpose of a default gateway in networking?
- A. To manage IP addresses
- B. To connect multiple networks together
- C. To translate domain names to IP addresses
- D. To
Certainly, here are more unique multiple-choice questions related to computer networks:
48. Which protocol is commonly used for transferring files between a client and a server over a network?
- A. SSH
- B. FTP
- C. SNMP
- D. SMTP
- **Answer: B. FTP**
49. In which layer of the OSI model does the TCP protocol operate?
- A. Transport
- B. Network
- C. Data Link
- D. Application
- **Answer: A. Transport**
50. What does TCP stand for in TCP/IP?
- A. Transfer Control Protocol
- B. Transmission Control Protocol
- C. Transport Connection Protocol
- D. Terminal Control Protocol
- **Answer: B. Transmission Control Protocol**
51. Which device operates at the Data Link layer of the OSI model and can segment collision domains?
- A. Router
- B. Hub
- C. Bridge
- D. Switch
- **Answer: D. Switch**
52. What is the purpose of a subnet mask in IPv4 addressing?
- A. To identify the network portion of an IP address
- B. To identify the host portion of an IP address
- C. To determine the default gateway
- D. To identify the broadcast address
- **Answer: A. To identify the network portion of an IP address**
53. Which of the following is a characteristic of UDP (User Datagram Protocol)?
- A. Connection-oriented protocol
- B. Reliable data transmission
- C. Error checking and retransmission of lost packets
- D. Best-effort delivery
- **Answer: D. Best-effort delivery**
54. What is the role of a DNS server in a network?
- A. To assign IP addresses to devices automatically
- B. To translate IP addresses to domain names
- C. To manage network security policies
- D. To establish secure connections between networks
- **Answer: B. To translate IP addresses to domain names**
55. Which network device operates at the Physical layer of the OSI model and regenerates signals?
- A. Router
- B. Switch
- C. Repeater
- D. Bridge
- **Answer: C. Repeater**
56. What is the purpose of ICMP (Internet Control Message Protocol) echo request and echo reply messages?
- A. To manage IP addresses
- B. To establish secure connections
- C. To troubleshoot network connectivity issues
- D. To encrypt data transmission
- **Answer: C. To troubleshoot network connectivity issues**
57. In TCP/IP, which layer is responsible for addressing, routing, and fragmentation?
- A. Application
- B. Transport
- C. Internet
- D. Network Interface
- **Answer: C. Internet**
58. Which protocol is used for dynamically assigning IP addresses to network devices?
- A. DNS
- B. DHCP
- C. ARP
- D. ICMP
- **Answer: B. DHCP**
59. What is the function of a router in a computer network?
- A. To connect multiple networks together
- B. To provide centralized authentication services
- C. To forward data packets between devices within the same network
- D. To encrypt data transmission
- **Answer: A. To connect multiple networks together**
60. Which of the following is NOT a valid network topology?
- A. Mesh
- B. Star
- C. Circle
- D. Bus
- **Answer: C. Circle**
61. What is the purpose of ARP (Address Resolution Protocol) in a network?
- A. To convert IP addresses to MAC addresses
- B. To translate domain names to IP addresses
- C. To manage network security policies
- D. To regulate network traffic flow
- **Answer: A. To convert IP addresses to MAC addresses**
62. Which device operates at the Physical layer of the OSI model and connects multiple network segments?
- A. Hub
- B. Switch
- C. Router
- D. Bridge
- **Answer: A. Hub**
63. What is the primary function of NAT (Network Address Translation)?
- A. To assign IP addresses to devices automatically
- B. To translate public IP addresses to private IP addresses
- C. To manage network security policies
- D. To regulate network traffic flow
- **Answer: B. To translate public IP addresses to private IP addresses**
64. Which network device operates at the Application layer of the OSI model?
- A. Router
- B. Switch
- C. Firewall
- D. Proxy Server
- **Answer: D. Proxy Server**
65. What is the purpose of a VLAN (Virtual Local Area Network)?
- A. To connect multiple networks together
- B. To divide a single physical network into multiple logical networks
- C. To manage network hardware resources
- D. To regulate network traffic flow
- **Answer: B. To divide a single physical network into multiple logical networks**
66. Which protocol is used for securely accessing web pages over HTTPS?
- A. HTTP
- B. FTP
- C. SSL/TLS
- D. SNMP
- **Answer: C. SSL/TLS**
67. What is the role of a proxy server in a network?
- A. To regulate network traffic flow
- B. To manage network security policies
- C. To translate domain names to IP addresses
- D. To act as an intermediary between clients and servers
- **Answer: D. To act as an intermediary between clients and servers**
68. Which layer of the OSI model is responsible for error detection and correction?
- A. Transport
- B. Network
- C. Data Link
- D. Physical
- **Answer: A. Transport**
69. What is the purpose of DHCP (Dynamic Host Configuration Protocol) in networking?
- A. To assign IP addresses to devices automatically
- B. To manage domain name registrations
- C. To encrypt data transmission
- D. To regulate network traffic
- **Answer: A. To assign IP addresses to devices automatically**
70. Which protocol is used for transferring email messages between servers?
- A. SMTP
- B. POP3
- C. IMAP
- D. SNMP
- **Answer: A. SMTP**
71. What is the primary function of a firewall in network security?
- A. To connect multiple networks together
- B. To regulate network traffic flow
- C. To manage IP addresses
- D. To translate domain names to IP addresses
- **Answer: B. To regulate network traffic flow**
72. Which network topology connects devices in a linear fashion and uses terminators to prevent signal reflection?
- A. Star
- B. Ring
- C. Mesh
- D. Bus
- **
Answer: D. Bus**
73. What is the purpose of ARP (Address Resolution Protocol) in a network?
- A. To convert IP addresses to MAC addresses
- B. To translate domain names to IP addresses
- C. To manage network security policies
- D. To regulate network traffic flow
- **Answer: A. To convert IP addresses to MAC addresses**
74. Which device operates at the Physical layer of the OSI model and connects multiple network segments?
- A. Hub
- B. Switch
- C. Router
- D. Bridge
- **Answer: A. Hub**
75. What is the primary function of NAT (Network Address Translation)?
- A. To assign IP addresses to devices automatically
- B. To translate public IP addresses to private IP addresses
- C. To manage network security policies
- D. To regulate network traffic flow
- **Answer: B. To translate public IP addresses to private IP addresses**
76. Which network device operates at the Application layer of the OSI model?
- A. Router
- B. Switch
- C. Firewall
- D. Proxy Server
- **Answer: D. Proxy Server**
77. What is the purpose of a VLAN (Virtual Local Area Network)?
- A. To connect multiple networks together
- B. To divide a single physical network into multiple logical networks
- C. To manage network hardware resources
- D. To regulate network traffic flow
- **Answer: B. To divide a single physical network into multiple logical networks**
78. Which protocol is used for securely accessing web pages over HTTPS?
- A. HTTP
- B. FTP
- C. SSL/TLS
- D. SNMP
- **Answer: C. SSL/TLS**
79. What is the role of a proxy server in a network?
- A. To regulate network traffic flow
- B. To manage network security policies
- C. To translate domain names to IP addresses
- D. To act as an intermediary between clients and servers
- **Answer: D. To act as an intermediary between clients and servers**
80. Which layer of the OSI model is responsible for error detection and correction?
- A. Transport
- B. Network
- C. Data Link
- D. Physical
- **Answer: A. Transport**
81. What is the purpose of DHCP (Dynamic Host Configuration Protocol) in networking?
- A. To assign IP addresses to devices automatically
- B. To manage domain name registrations
- C. To encrypt data transmission
- D. To regulate network traffic
- **Answer: A. To assign IP addresses to devices automatically**
82. Which protocol is used for transferring email messages between servers?
- A. SMTP
- B. POP3
- C. IMAP
- D. SNMP
- **Answer: A. SMTP**
83. What is the primary function of a firewall in network security?
- A. To connect multiple networks together
- B. To regulate network traffic flow
- C. To manage IP addresses
- D. To translate domain names to IP addresses
- **Answer: B. To regulate network traffic flow**
84. Which network topology connects devices in a linear fashion and uses terminators to prevent signal reflection?
- A. Star
- B. Ring
- C. Mesh
- D. Bus
- **Answer: D. Bus**
85. What is the primary function of NAT (Network Address Translation)?
- A. To assign IP addresses to devices automatically
- B. To translate public IP addresses to private IP addresses
- C. To manage network security policies
- D. To regulate network traffic flow
- **Answer: B. To translate public IP addresses to private IP addresses**
86. Which network device operates at the Application layer of the OSI model?
- A. Router
- B. Switch
- C. Firewall
- D. Proxy Server
- **Answer: D. Proxy Server**
87. What is the purpose of a VLAN (Virtual Local Area Network)?
- A. To connect multiple networks together
- B. To divide a single physical network into multiple logical networks
- C. To manage network hardware resources
- D. To regulate network traffic flow
- **Answer: B. To divide a single physical network into multiple logical networks**
88. Which protocol is used for securely accessing web pages over HTTPS?
- A. HTTP
- B. FTP
- C. SSL/TLS
- D. SNMP
- **Answer: C. SSL/TLS**
89. What is the role of a proxy server in a network?
- A. To regulate network traffic flow
- B. To manage network security policies
- C. To translate domain names to IP addresses
- D. To act as an intermediary between clients and servers
- **Answer: D. To act as an intermediary between clients and servers**
90. Which layer of the OSI model is responsible for error detection and correction?
- A. Transport
- B. Network
- C. Data Link
- D. Physical
- **Answer: A. Transport**
91. What is the purpose of DHCP (Dynamic Host Configuration Protocol) in networking?
- A. To assign IP addresses to devices automatically
- B. To manage domain name registrations
- C. To encrypt data transmission
- D. To regulate network traffic
- **Answer: A. To assign IP addresses to devices automatically**
92. Which protocol is used for transferring email messages between servers?
- A. SMTP
- B. POP3
- C. IMAP
- D. SNMP
- **Answer: A. SMTP**
93. What is the primary function of a firewall in network security?
- A. To connect multiple networks together
- B. To regulate network traffic flow
- C. To manage IP addresses
- D. To translate domain names to IP addresses
- **Answer: B. To regulate network traffic flow**
94. Which network topology connects devices in a linear fashion and uses terminators to prevent signal reflection?
- A. Star
- B. Ring
- C. Mesh
- D. Bus
- **Answer: D. Bus**
95. What is the primary function of NAT (Network Address Translation)?
- A. To assign IP addresses to devices automatically
- B. To translate public IP addresses to private IP addresses
- C. To manage network security policies
- D. To regulate network traffic flow
- **Answer: B. To translate public IP addresses to private IP addresses**
96. Which network device operates at the Application layer of the OSI model?
- A. Router
- B. Switch
- C. Firewall
- D. Proxy Server
- **Answer: D. Proxy Server**
97. What is the purpose of a VLAN (Virtual Local Area Network)?
- A. To connect multiple networks together
-
B. To divide a single physical network into multiple logical networks
- C. To manage network hardware resources
- D. To regulate network traffic flow
- **Answer: B. To divide a single physical network into multiple logical networks**
98. Which protocol is used for securely accessing web pages over HTTPS?
- A. HTTP
- B. FTP
- C. SSL/TLS
- D. SNMP
- **Answer: C. SSL/TLS**
99. What is the role of a proxy server in a network?
- A. To regulate network traffic flow
- B. To manage network security policies
- C. To translate domain names to IP addresses
- D. To act as an intermediary between clients and servers
- **Answer: D. To act as an intermediary between clients and servers**
100. Which layer of the OSI model is responsible for error detection and correction?
- A. Transport
- B. Network
- C. Data Link
- D. Physical
- **Answer: A. Transport**
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