CS601- Data Communication Mid and Final Terms Solved Questions VU Study

CS601- Data Communication Mid and Final Terms Solved Questions – VU Study

Set of rules that govern communication is called
_ OSI model
_ Protocol 
_ TCP/IP model
_ Datagram

Which topology requires a central controller or hub?
_ Mesh
_ Star
_ Bus
_ Ring

1. In a connection, more than two devices can share a single link.
a. Point-to-point
b. Primary
c. Multipoint
d. Secondary

2. Communication between a computer and a keyboard involves
transmission
a. Full-duplex
b. Half-duplex
c. Simplex
d. Automatic

3. In a network with 25 computers, which topology would require the most
extensive cabling?
a. Star
b. Mesh
c. Bus
d. Ring
4. Which topology requires a central controller or hub?
a. Star
b. Mesh
c. Bus
d. Ring

5. The is the physical path over which a message travels.
a. Protocol
b. Medium
c. Signal
d. All of the above

6. Which organization has authority over interstate and international commerce in the
communications field?
a. ITU-T
b. IEEE
c. ISO
d. FCC

7. The information to be communicated in a data communications system is the
a. Medium
b. Protocol
c. Transmission
d. Message

8. Frequency of failure and network recovery time after a failure are measures of the
of a network.
a. Performance
b. Security
c. Reliability
d. Feasibility

9. In transmission, the channel capacity is shared by both communicating devices
at all times.
a. Full-duplex             b. Simplex     c. Half-duplex    d. Half-Simplex

10. An unauthorized user is a network issue.
a. Performance
b. Reliability
c. Security
d. All of the above

11. Which topology requires a multipoint connection?
a. Mesh
b. Star
c. Ring
d. Bus

12. A television  broadcast is an example of transmission.
a. Half-duplex
b. Full-duplex
c. Simplex
d. Automatic

13. A connection provides a dedicated link between two devices.
a. Multipoint
b. Point-to-Point
c. Primary
d. Secondary

14. A cable break in a topology stops all transmission.
a. Mesh
b. Star
c. Primary
d. Bus

15. The layer changes bits into electromagnetic signals.
a. Physical
b. Transport
c. None of the above
d. Data link

16. The physical layer is concerned with the transmission of over the physical
medium.
a. Programs
b. Protocols
c. Bits
d. Dialogs

17. Mail services are available to network users through the layer.
a. Data link
b. Physical
c. Application
d. Transport

18. As the data packet moves from the lower to the upper layers, headers are .
a. Added                 b. Rearranged     c. Modified    d. Subtracted

19. As the data packet moves from the upper to the lower layers, headers are .
a. Removed
b. Added
c. Rearranged
d. Modified
b
20. The layer lies between the network layer and the application layer.
a. Data link
b. Physical
c. Transport
d. None of the above

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

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

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

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

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

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

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

28. The layer is the layer closest to the transmission medium.
a. Network
b. Physical
c. Data link
d. Transport
The correct answer is b
  ———————————Chapter 3: Signals——————————
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

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)

31. A periodic signal can always be decomposed into .
a. Exactly an odd number of sine waves
b. A set of sine waves, one of which must have a phase of 0°
c. A set of sine waves
d. None of the above

32. A periodic signal completes one cycle in 0.001 s. What is the frequency?
a. 1 Hz
b. 100 Hz
c. 1 KHz
d. 1 MHz

33. In a frequency-domain plot, the horizontal axis measures the .
a. Frequency
b. Peak amplitude
c. Phase
d. Slope

34. In a time-domain plot, the vertical axis is a measure of ……………………………………..
a. Frequency
b. Phase
c. Amplitude
d. Time
The correct answer is c
35. In a time-domain plot, the horizontal axis is a measure of .

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