Computer Networks MCQ Questions and Answers

Computer Networks MCQ Questions and Answers

Looking for Computer Networks MCQ Questions and Answers? Prepare for success with our expertly crafted practice questions for all levels.

In today’s rapidly evolving digital landscape, computer networks play a vital role in connecting people and devices across the globe. 

As businesses and individuals increasingly rely on these networks for communication, data sharing, and online transactions, it becomes imperative to possess a comprehensive understanding of computer networking concepts. 

Whether you are a student pursuing a degree in computer science or an IT professional seeking to enhance your knowledge, one effective way to assess your understanding is through Multiple Choice Questions (MCQs). 

This article provides you with a valuable resource – Computer Network MCQ Quiz Questions with Answers doc and PDF download – that can help you test your knowledge and gain insights into various aspects of computer networking.

It covers Ethernet, TCP/IP protocol suite, routing protocols, WAN technologies, etc.

What are Computer Networks

Computer networks are a fundamental part of modern technology, connecting computers and other devices to enable communication and the sharing of resources.

A shared medium enables interconnected devices to communicate, thus defining a computer network. 

These devices could include computers, printers, servers, routers, switches, etc. A computer network allows users to share data and resources such as internet connections, file storage space and printers. It makes it an essential tool for businesses that must share information between employees or departments.

Networks also allow individuals to connect with others across the globe through email, social media or video conferencing applications.

There are various kinds of computer networks, including wide area networks (WANs), local area networks (LANs), metropolitan area networks (MANs) and wireless networks.

Computer Network MCQ with answers Pdf download

1. In fibre optics, the signal source is ___ waves.
a) light
b) radio
c) infrared
d) very low frequency

Answer: (a) Fiber optics use light waves as the signal source for transmitting data. Light signals are generated and sent through the fiber-optic cables to carry information over long distances.
2. The ___ layer is responsible for node-to-node packet delivery.
a) session
b) network
c) physical
d) data link
Answer: (d) The data link layer is responsible for node-to-node packet delivery in a network. It provides error-free transfer of data frames between adjacent nodes over a physical link.

3. The speed mismatch between the sender and the receiver is called ___.
a) error control
b speed error
c flow control
d transmission control
Answer: (c) Flow control refers to the techniques used to manage the speed mismatch between the sender and receiver in a communication system. It ensures that the sender does not overwhelm the receiver with data and helps in maintaining a steady and efficient data transfer rate.

4. FTP runs exclusively over ___.
b) TCP
Answer: (b) FTP (File Transfer Protocol) runs exclusively over TCP (Transmission Control Protocol). TCP offers reliable and ordered delivery of data packets, which is essential for file transfer operations performed by FTP

5. BSC is developed by ___.
a) Motorola
b) IBM
c) Nokia
d) Toshiba
Answer: (b) BSC (Binary Synchronous Communication) was developed by IBM. It is a protocol used for serial communication between mainframe computers and peripheral devices.

6. Which of the following primarily uses guided media?
a) cellular telephone system
b) local telephone system
c) satellite communications
d) radio broadcasting
Answer: (b) The local telephone system primarily uses guided media, such as copper wires or fiber-optic cables, for communication. Guided media provide a physical path for transmitting signals and are commonly used for wired communication systems.

7. When discussing unguided media, we usually refer to ___.
a) metallic wires
b) nonmetallic wires
c) the atmosphere
d) None of the above
Answer: (c) Unguided media refers to wireless communication channels that do not rely on physical cables or wires. Instead, they utilize the atmosphere as a medium for transmitting signals, such as radio waves or microwave signals.

8. This is the ability to increase system performance gradually as the workload grows just by adding processors.
a) multipliability
b) inheritance
c) scalability
d) vectorization
Answer: (c) Scalability refers to the ability of a system to handle increasing workloads and grow in performance by adding resources, such as processors, without causing a significant decline in performance. It allows for efficient expansion and adaptability of the system.

9. PSTN represents ___.
a) private switched transmission network
b) public switched telephone network
c) private switched telephone network
d) public switched transmission network
Answer: (b) PSTN (Public Switched Telephone Network) is a global telephone network that uses circuit-switched technology to provide telephone communication services to the public. It is the traditional landline telephone system.

10. SMTP refers to ___.
a) Simple mail transfer protocol
b) Small mail transfer protocol
c) Simple mass transfer protocol
d) Small mail transfer protocol
Answer: (a) SMTP, stand for Simple Mail Transfer Protocol, serves as a widely accepted protocol utilized for the transmission and reception of email messages via the Internet. It is responsible for the transmission of emails between mail servers.

11. Class A, Class B, and Class C together are referred to as ___ addressing or primary address class if the IP.
a) classful
b) eventful
c) graded
d) ranked
Answer: (a) Class A, Class B, and Class C are the three primary address classes in the IPv4 addressing scheme. Together, they are referred to as classful addressing, which defines the range and format of IP addresses within each class.

12. ___ overcame the registered number issue by assigning each organization one network number from the IPv4 address space.
a) Tracking
b) Subnetting
c) Packeting
d) Switching
Answer: (b) Subnetting is a technique used in IP networking to divide a single network into multiple smaller subnetworks or subnets. It helps overcome the limited availability of registered network numbers by assigning a portion of the network address space to each organization.

13. Equipment that controls the physical and electrical termination of the ISDN at the user’s premises is called ___.
a) NT1
b) NT2
c) NT3
d) NT4
Answer: (a) NT1 (Network Termination 1) is the equipment that controls the physical and electrical termination of the ISDN (Integrated Services Digital Network) at the user’s premises. It acts as an interface between the user’s equipment and the ISDN network.

14. A data channel contains ___.
a) control information
b) management information
c) miscellaneous functions
d) user data/information
Answer: (d) A data channel carries user data or information in a communication system. It is responsible for transmitting the actual data being communicated between the sender and the receiver.

15. QOS represents ___.
a) Quality of System
b) Quality of Service
c) Queue of System
d) Queue of Service
Answer: (b) QOS (Quality of Service) refers to the performance characteristics and reliability of a network or communication system. It encompasses various aspects, such as bandwidth, latency, error rate, and prioritization of different types of traffic.

16. ISDN is an acronym for ___.
a) Information Services for Digital Networks
b) Internetwork System for Data Networks
c) Integrated Services Digital Networks
d) Integrated Signals Digital Network
Answer: (c) ISDN (Integrated Services Digital Network) is a telecommunications standard that enables the transmission of voice, video, and data over digital lines. It provides a set of services and protocols for efficient and reliable communication.


17. Data rate depends on three factors
a) Bandwidth available
b) Level of the signals we use
c) Quality of the channel
d) All of the above
Answer: (d) The data rate in a communication system depends on the available bandwidth, the level of the signals used, and the quality of the channel. These factors collectively determine the maximum achievable data rate.

18. Which layer is not really a layer?
a) Host of the network
b) Network to host
c) Application to presentation
d) None
Answer: (a) The “Host of the network” is not a layer in the OSI (Open Systems Interconnection) model or any other networking model. The OSI model consists of seven layers – Data Link, Physical, Network, Transport, Session, Presentation, and Application.

19. Reference point ___ is the specification for connecting NT1 with NT2.
a) R
b) S
c) T
d) U
Answer: (c) Reference point T is the specification for connecting the NT1 (Network Termination 1) equipment with the NT2 (Network Termination 2) equipment in an ISDN (Integrated Services Digital Network) connection. It defines the interface and signaling protocols between these two components.

20. The radio communication spectrum is divided into bands based on ___.
a) amplitude
b) frequency
c) cost and hardware
d) transmission medium
Answer: (b) The radio communication spectrum is divided into bands based on frequency. Each band represents a range of frequencies allocated for specific types of communication, such as AM radio, FM radio, television, mobile communications, and more.

21. Which international agency is concerned with standards in science and technology?
a) ISO
b) OSI
c) EIA
Answer: (a) ISO (International Organization for Standardization) is an international agency that develops and publishes standards in various fields, including science and technology. It promotes global standardization to ensure compatibility, interoperability, and quality in products and services.

22. ___ blocks are identified using syntax similar to that of IPv4 addresses: a four-part dotted – decimal address following by a slash, then a number from 0 to 32 : A)B)C)D/N.
a) IPv4 CICR
b) IPv4 MIDR
c) IPv4 CIMR
d) IPv4 CIDR
Answer: (d) CIDR blocks for IPv4 (Classless Inter-Domain Routing) are recognized by employing a syntax akin to that of IPv4 addresses. It consists of a four-part dotted-decimal address, followed by a slash and a number from 0 to 32, representing the network prefix length.

23. The term “email” applies both to the Internet email system based on the ___ and to ___, allowing users within one organization to email each other.
a) FTP, Intranet Systems
b) SMTP, Intranet Systems
c) FTP, Internet Systems
d) SMTP, Internet Systems
Answer: (b) The term “email” applies both to the Internet email system based on the SMTP (Simple Mail Transfer Protocol) and to Intranet Systems, which allow users within one organization to email each other. SMTP is responsible for the transmission of email messages over the Internet.

24. Which agency created standards for telephone communications (V series) and for network interfaces and public networks (X series)?
a) ATT
b) ITU-T
d) ISO
Answer: (b) ITU-T (International Telecommunication Union – Telecommunication Standardization Sector) is the agency responsible for creating standards for telephone communications (V series) and for network interfaces and public networks (X series). It is a specialized agency of the United Nations.

25. ___ CSMA is less greedy whereas ___ CSMA is selfish.
a) Non-persistent, 1-persistent
b) 1-persistent, p-persistent
c) p-persistent, 1-persistent
d) 1-persistent, non-persistent
Answer: (a) Non-persistent CSMA (Carrier Sense Multiple Access) is less greedy because it waits for a random period of time before reattempting transmission after detecting a collision. 1-persistent CSMA is considered selfish because it continually attempts transmission even if a collision occurs, potentially causing more collisions in the process.

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