Data Communication and Networking MCQs offer a valuable resource to test and enhance your understanding of the intricate world of data transmission, network protocols, and communication technologies. Whether you’re a student preparing for exams or a professional aiming to strengthen your knowledge, these multiple-choice questions with Answers cover a wide spectrum of topics, including network architecture, protocols, and security. These MCQs will help students in university exams,competitive exams and interviews preparation.

Section-1

PRACTICE IT NOW TO SHARPEN YOUR CONCEPT AND KNOWLEDGE

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1. How many frames are included for traffic in TDMA , if the total duration of traffic is 100 seconds and each frame in the TDMA system has a duration of 5 seconds.

  • 1
  •  24 
  • 25
  • 20

2. What is the port number of the HTTP

  • 80
  • 25
  • 23
  • 20/21

3. What is the port number of the SMTP

  • 25 
  • 23
  • 20/21
  • 27960

4. TCP is ______________

  • Connection-oriented
  • Reliable
  • Both a & b
  • None of these

5. Which is a network protocol that is based on UDP and is a component of the Internet Protocol Suite, defined by IETF(Internet Engineering Task Force)

  • SNMP 
  • DNS
  • Screening
  • Multicasting

6. In X.25 defines the protocols from ____layer to _______layer

  • Layer 2 to Layer 3
  • Layer 1 to Layer 2
  • Layer 1 to Layer 3
  • Layer 3 to Layer 2

7. Advantages of cell relay are

  • High-speed transmission
  • Multiplexing transmission
  • Both a & b
  • None of these

8. When compared with the OSI reference model, the IEEE standard contains the following layers:

  • Physical layer
  • Medium access control(MAC) equivalent to the lower part of the OSI data link layer
  • Logical link layer(LAC) equivalent to the upper part of the data link layer
  • Network layer, the OSI network layer, that performs some of the higher order layer functions
  • All of these

9. In a token ring, the stations are connected to the __________

  •  Logical ring 
  • Physical ring
  • Both a & b
  • None of these

10. A _________ preamble is used to synchronize the receiver’s clock

  • more than one byte in size
  • Three-byte
  • Two-byte
  • One-byte

Section-2

PRACTICE IT NOW TO SHARPEN YOUR CONCEPT AND KNOWLEDGE

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1. The CCITT Recommendation X.25 specifies ______ three layers of communications.

  • Application, presentation and session
  • Session, transport and network
  • Physical, data link and network.
  • Data link, network and transport

2. In asynchronous serial communication the physical layer provides

  • start and stop signalling
  • flow control
  • both (a) and (b)
  • none of the mentioned

3. Which type of switching uses the entire capacity of a dedicated link?

  • Circuit switching
  • Datagram
  • Virtual Circuit
  • Message switching

4. In OSI reference model, which of the following layer provides error-free delivery of data?

  • Session layer
  • Presentation layer
  • Transport layer
  • Network layer.

5. Which of the following layer protocols are responsible for user and the application programme support such as passwords, resource sharing etc?

  • Layer 4 protocols
  • Layer 5 protocols
  • Layer 6 protocols
  • Layer 7 protocols

6. In OSI model, which of the following layer transforms information from machine format into that understandable by user?

  • Application
  • Session
  • Presentation
  • Physical

7. A decrease in magnitude of current, voltage, a power signal in transmission between points is known as _________

  • attenuation
  • aloha
  • amplitude
  • carrier

8. A medium access control technique for multiple access transmission media is ______

  • attenuation
  • aloha
  • amplitude
  • carrier

9. The size or magnitude of a voltage or current waveform is ___________

  • attenuation
  • aloha
  • amplitude
  • carrier
  • hub
  • gateway
  • repeater
  • bridge
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