Basic Computer Skills MCQs with Answers

Networking MCQ Quiz

Computer networks are the backbone of modern communication and technology. From sending emails to managing cloud services, networks make it all possible. To succeed in exams, competitive tests, or job interviews, mastering networking concepts is essential.

1. The computer network is
Correct Answer: C Explanation: A network can be wired (with cable) or wireless (without cable).
2. FDDI used which type of physical topology?
Correct Answer: B Explanation: FDDI (Fiber Distributed Data Interface) uses a dual-ring topology.
3. FTP stands for
Correct Answer: A Explanation: FTP is the standard protocol for transferring files across networks.
4. Ethernet system uses which of the following technology?
Correct Answer: A Explanation: Ethernet commonly uses bus technology for data transmission.
5. Which of the following are the network services?
Correct Answer: D Explanation: Networks provide file, print, database and other services.
6. If all devices are connected to a central hub, then topology is called
Correct Answer: C Explanation: A star topology connects all devices to a central hub.
7. FDDI stands for
Correct Answer: A Explanation: FDDI is a high-speed network standard based on optical fiber.
8. Which of the following is an application layer service?
Correct Answer: D Explanation: All listed services belong to the Application Layer.
9. Which is the main function of transport layer?
Correct Answer: B Explanation: The transport layer ensures reliable end-to-end communication.
10. The ............. layer changes bits onto electromagnetic signals.
Correct Answer: A Explanation: The physical layer deals with signals and bit transmission.
11. In mesh topology, relationship between one device and another is ..............
Correct Answer: D Explanation: In mesh topology, devices are directly connected to each other in peer-to-peer form.
12. The performance of data communications network depends on ..............
Correct Answer: D Explanation: Network performance is influenced by users, hardware/software, and transmission.
13. Find out the OSI layer, which performs token management.
Correct Answer: C Explanation: Token management is handled by the Session Layer in the OSI model.
14. The name of the protocol which provides virtual terminal in TCP/IP model is
Correct Answer: A Explanation: Telnet provides a virtual terminal service in the TCP/IP model.
15. The layer one of the OSI model is
Correct Answer: A Explanation: The first layer of the OSI model is the Physical Layer.
16. What is the name of the network topology in which there are bi-directional links between each possible node?
Correct Answer: D Explanation: A mesh topology has direct bi-directional links between all nodes.
17. What is the commonly used unit for measuring the speed of data transmission?
Correct Answer: B Explanation: Baud is the standard unit for symbol rate in data transmission.
18. Which of the communication modes support two-way traffic but in only one direction at a time?
Correct Answer: B Explanation: Half-duplex allows two-way communication, but only one side can transmit at a time.
19. The loss in signal power as light travels down the fiber is called .............
Correct Answer: A Explanation: Attenuation is the reduction in signal power over distance.
20. Which of the following TCP/IP protocols is used for transferring files from one machine to another?
Correct Answer: A Explanation: FTP (File Transfer Protocol) is used for transferring files across networks.

Set-2

21. A network that needs human beings to manually route signals is called....
Correct Answer: C Explanation: Telephone-switched networks require manual routing of signals.
22. TCP/IP .................. layer corresponds to the OSI model's top three layers.
Correct Answer: A Explanation: TCP/IP's Application layer maps to the OSI Application, Presentation, and Session layers.
23. Which of the transport layer protocols is connectionless?
Correct Answer: A Explanation: UDP is a connectionless transport protocol, unlike TCP.
24. Which of the following applications allows a user to access and change remote files without actual transfer?
Correct Answer: C Explanation: NFS (Network File System) lets users work with remote files without transferring them.
25. The data unit in the TCP/IP layer is called a .....
Correct Answer: D Explanation: In TCP/IP, the data unit is called a frame at the Network Interface layer.
26. In which of the following topology, all the nodes are connected to a single cable?
Correct Answer: B Explanation: In bus topology, all nodes are connected through a single backbone cable.
27. In star topology, each device is connected to a ………
Correct Answer: B Explanation: In star topology, all devices connect to a central hub or switch.
28. Which topology requires a multipoint connection?
Correct Answer: C Explanation: Bus topology uses a multipoint connection, sharing a single cable among all devices.
29. What is the main advantage of a ring topology?
Correct Answer: C Explanation: In a ring, each node gets equal opportunity for data transmission.
30. In mesh topology, the number of cables required to connect n devices is ………
Correct Answer: C Explanation: Mesh requires a dedicated link between every pair of devices.
31. The physical layer of OSI model is concerned with ………
Correct Answer: A Explanation: The physical layer deals with the transmission of raw bits over a communication channel.
32. Which topology is the most reliable?
Correct Answer: A Explanation: Mesh topology provides multiple communication paths, making it highly reliable.
33. The presentation layer is responsible for ………
Correct Answer: D Explanation: The Presentation layer handles translation, compression, and encryption of data.
34. The transport layer is responsible for ………
Correct Answer: B Explanation: The Transport layer ensures end-to-end, process-to-process delivery of data.
35. The network layer is responsible for ………
Correct Answer: A Explanation: The Network layer is responsible for routing and source-to-destination delivery.
56. Which topology provides a direct connection between every pair of devices?
Correct Answer: C Explanation: In a mesh topology, each device is directly connected to all others.
57. In OSI model, the session layer is responsible for ………
Correct Answer: C Explanation: Session layer manages dialog control and synchronization.
58. Which OSI layer is responsible for translation of data?
Correct Answer: B Explanation: Presentation layer translates data between application and network formats.
59. Which OSI layer establishes, manages, and terminates connections?
Correct Answer: B Explanation: Session layer manages connection setup, maintenance, and termination.
60. Which OSI layer is responsible for routing?
Correct Answer: B Explanation: Routing of packets is a function of the Network layer.
61. The unit of data at the data link layer is called ………
Correct Answer: A Explanation: Data link layer encapsulates packets into frames for transmission.
62. The unit of data at the network layer is called ………
Correct Answer: B Explanation: The Network layer delivers data in the form of packets.
63. The unit of data at the transport layer is called ………
Correct Answer: C Explanation: At the transport layer, data is segmented into smaller units called segments.
64. The unit of data at the physical layer is called ………
Correct Answer: C Explanation: The Physical layer deals with the transmission of raw bits.
65. The unit of data at the application layer is called ………
Correct Answer: D Explanation: The Application layer communicates using complete messages.
66. Which OSI layer is responsible for error-free delivery of data?
Correct Answer: B Explanation: The Transport layer ensures error-free, end-to-end delivery.
67. Which OSI layer provides end-to-end communication services for applications?
Correct Answer: A Explanation: Transport layer provides end-to-end communication between applications.
68. Which OSI layer is responsible for data compression?
Correct Answer: B Explanation: Compression and decompression of data is done at the Presentation layer.
69. Which OSI layer is responsible for defining electrical and physical specifications of the data connection?
Correct Answer: D Explanation: Physical layer defines hardware, electrical, and mechanical specifications.
70. Which OSI layer is responsible for logical addressing?
Correct Answer: B Explanation: Logical addressing (IP addresses) is provided by the Network layer.

Set-5

71. The OSI model consists of ……… layers.
Correct Answer: C Explanation: The OSI model is divided into 7 layers from Physical to Application.
72. TCP belongs to which OSI layer?
Correct Answer: B Explanation: TCP operates at the Transport layer of the OSI model.
73. HTTP works at which OSI layer?
Correct Answer: A Explanation: HTTP is an Application layer protocol for web communication.
74. Which OSI layer is responsible for flow control?
Correct Answer: B Explanation: Flow control is managed by the Transport layer to prevent data loss.
75. IP addressing belongs to which OSI layer?
Correct Answer: B Explanation: Logical addressing (IP addresses) works at the Network layer.
76. SMTP is used for ………
Correct Answer: C Explanation: SMTP (Simple Mail Transfer Protocol) is used to send emails.
77. FTP is used for ………
Correct Answer: B Explanation: FTP (File Transfer Protocol) is used to upload and download files.
78. TELNET is used for ………
Correct Answer: A Explanation: TELNET allows a user to log in remotely to another computer.
79. DNS is used to ………
Correct Answer: A Explanation: DNS translates human-friendly domain names into IP addresses.
80. Which layer of the OSI model is responsible for error detection?
Correct Answer: B Explanation: Error detection in frames is handled by the Data Link layer.
81. Which device operates at the Network layer?
Correct Answer: C Explanation: Routers work at the Network layer to forward packets based on IP addresses.
82. Which device operates at the Data Link layer?
Correct Answer: A Explanation: Switches operate at the Data Link layer using MAC addresses.
83. Which device operates at the Physical layer?
Correct Answer: A Explanation: Hubs simply forward bits and operate at the Physical layer.
84. Which protocol is used to transfer files over the Internet securely?
Correct Answer: C Explanation: SFTP (Secure File Transfer Protocol) uses SSH to provide secure file transfer.
85. Which of the following is a connectionless protocol?
Correct Answer: B Explanation: UDP is a connectionless transport protocol.
86. Which of the following is a connection-oriented protocol?
Correct Answer: B Explanation: TCP establishes a reliable connection before transmitting data.
87. Which of the following is an IP address class not used in practice?
Correct Answer: D Explanation: Class E addresses are reserved for experimental purposes and are not used for normal public networking.
88. IPv6 address size is ………
Correct Answer: C Explanation: IPv6 addresses are 128 bits long and written in hexadecimal notation.
89. Which of the following is used to find the shortest path in routing?
Correct Answer: B Explanation: Dijkstra's algorithm is widely used in routing to determine the shortest path.
90. Which of the following is not an Application layer protocol?
Correct Answer: C Explanation: TCP is a Transport layer protocol, not an Application layer protocol.

Set-6

91. Which protocol is commonly used for network management?
Correct Answer: B Explanation: SNMP (Simple Network Management Protocol) is used to monitor and manage network devices.
92. Which protocol automatically assigns IP addresses to devices on a network?
Correct Answer: B Explanation: DHCP (Dynamic Host Configuration Protocol) automatically assigns IP addresses to network devices.
93. Which protocol is used to synchronize the time of computers on a network?
Correct Answer: A Explanation: NTP (Network Time Protocol) synchronizes the clocks of computers over a network.
94. Which network device regenerates weak signals?
Correct Answer: B Explanation: A repeater regenerates and amplifies weak signals to extend network distance.
95. Which protocol is used to securely access remote computers?
Correct Answer: B Explanation: SSH (Secure Shell) provides encrypted remote login and command execution.
96. Which protocol is commonly used for network management?
Correct Answer: B Explanation: SNMP (Simple Network Management Protocol) is used to monitor and manage network devices.
97. Which protocol automatically assigns IP addresses to devices on a network?
Correct Answer: B Explanation: DHCP (Dynamic Host Configuration Protocol) automatically assigns IP addresses to devices on a network.
98. Which protocol is used to synchronize the time of computers on a network?
Correct Answer: A Explanation: NTP (Network Time Protocol) synchronizes the clocks of computers over a network.
99. Which network device regenerates weak signals?
Correct Answer: B Explanation: A repeater regenerates and amplifies weak signals to extend network communication.
100. Which protocol is used to securely access remote computers?
Correct Answer: B Explanation: SSH (Secure Shell) provides encrypted remote login and secure command execution.
101. The maximum length of an IPv4 address is ………
Correct Answer: B Explanation: IPv4 addresses are 32-bit long.
102. Which of the following is a distance vector routing protocol?
Correct Answer: B Explanation: RIP (Routing Information Protocol) is a classic distance vector routing protocol.
103. Which of the following is a link state routing protocol?
Correct Answer: B Explanation: OSPF (Open Shortest Path First) is a widely used link state routing protocol.
104. Which routing protocol is used on the Internet for inter-domain routing?
Correct Answer: C Explanation: BGP (Border Gateway Protocol) is used for inter-domain routing on the Internet.
105. Which of the following protocols provides error reporting?
Correct Answer: B Explanation: ICMP is used for error reporting and network diagnostics (e.g., ping).
106. The protocol used to resolve IP addresses to MAC addresses is?
Correct Answer: A Explanation: ARP (Address Resolution Protocol) maps IP addresses to corresponding MAC addresses on a local network.

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