Data Communication and networking Mcqs for the preparation of Competitive exams

21. Layer 2 lies between the physical layer and the _______ layer.
a. Data link
b. Network
c. Transport
d. None of the above

View Answer
  b. Network

22. When data are transmitted from device A to device B, the header from A’s layer 4 is read by B’s _______ layer.
a. Application
b. Physical
c. Transport
d. None of the above

View Answer
c. Transport

23. Which layer functions as a liaison between user support layers and network support layers?
a. Network layer
b. Transport layer
c. Physical layer
d. Application layer

View Answer
 b. Transport layer

24. What is the main function of the transport layer?
a. Process-to-process delivery
b. Node-to-node delivery
c. Synchronization
d. Updating and maintenance of routing tables

View Answer
 a. Process-to-process delivery

25. Which of the following is an application layer service?
a. Remote log-in
b. File transfer and access
c. Mail service
d. All the above

View Answer
d. All the above 

 

26. The Internet model consists of _______ layers.
a. Three
b. Five
c. Seven
d. Eight

View Answer
b. Five

27. The process-to-process delivery of the entire message is the responsibility of the _______ layer.
a. Physical
b. Network
c. Transport
d. Application

View Answer
c. Transport

28. The _______ layer is the layer closest to the transmission medium.
a. Network
b. Physical
c. Data link
d. Transport

View Answer
 b. Physical

29. Before data can be transmitted, they must be transformed to ________.
a. Electromagnetic signals
b. Periodic signals
c. Aperiodic signals
d. Low-frequency sine waves

View Answer
  a. Electromagnetic signals

30. When one of the components of a signal has a frequency of zero, the average amplitude of the signal ________.
a. Is less than zero
b. Is greater than zero
c. Is zero
d. (a) or (b)

View Answer
  b. Is greater than zero

 

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