MCQs On Data Communication Services Part-2

Here are the collections of the top 20 MCQs on data communication services includes multiple-choice questions on the advantages and drawbacks of frame relay, data-link connection identifiers (DLCIs) and the advantages of a virtual path.

1. Which of the following is/are the drawbacks of frame relay.
i) Frames are delivered unreliably ii) Packets having errors are simply discarded iii) Frame relay does not provide flow control iv) Frame relay is much slower than X.25
A) i, ii and iv only
B) ii, iii and iv only
C) i, ii and iii only
D) All i, ii, iii and iv

2. In ……………… packets may not be delivered in the same sequence like that at the sending end.
A) X.25
B) X.21
C) Frame relay
D) SMDS

3. …………….. addressing is performed using virtual circuit addresses known as data-link connection identifiers (DLCIs).
A) X.25
B) X.21
C) ATM
D) Frame relay

4. State whether the statements are True or False
i) X.25 networks work at speed up to 64 kbps ii) X.25 does not provide flow control iii) X.25 provides acknowledgment signal
A) i-True, ii-False, iii-True
B) i-False, ii-False, iii-True
C) i-True, ii-True, iii-False
D) i-False, ii-True, iii-False

5. State whether the following statements are true.
i) Frame relay supports virtual leased line ii) Bad frame is discarded by frame relay iii) Frames are delivered in proper order
A) i and ii only
B) ii and iii only
C) i and iii only
D) All i, ii and iii

6. …………… provides minimal services, primarily a way to determine the start and end of each frame and the detection of transmission error.
A) X.25
B) X.21
C) Frame relay
D) SMDS

7. In ………………… bad frames can be received back by sending an acknowledgment signal.
A) X.25
B) X.21
C) ATM
D) Frame relay

8. Asynchronous Transfer Mode (ATM) provides services under
i) Compressed voice and video ii) Synchronous TDM streams such as T-1 iii) Services using the constant bit rates
A) i and ii only
B) ii and iii only
C) i and iii only
D) All i, ii and iii

9. ATM has advantages of better reliability and fidelity which allows faster packet switching than ……..
A) X.21
B) X.25
C) Frame relay
D) SMDS

10. …………….. is used in non-ISDN systems where the data rates are very high.
A) X.21
B) X.25
C) ATM
D) SMDS

11. The …………………. of the ATM protocol involves the specifications of a transmission medium and signal encoding scheme.
A) Physical layer
B) ATM layer
C) High layer
D) ATM adaption layer (AAL)

12. …………… is a high-speed switching network architecture created in the late 1980s / early 1990s to apply circuit switching concepts to data networks.
A) X.21
B) ATM
C) X.25
D) SMDS

13. ………….. defines the transmission of data in fixed-size cells and it also defines the use of logical connections.
A) Physical layer
B) ATM layer
C) High layer
D) ATM adaption layer (AAL)
14. ……………. is a service dependent layer, which is used for supporting the information transfer protocol not based on ATM.
A) Physical layer
B) ATM layer
C) High layer
D) ATM adaption layer (AAL)

15. The ATM protocol architecture consists of the following separate plans
i) user plane ii) control plane iii) server plane iv) plane management
A) i, ii and iv only
B) ii, iii and iv only
C) i, ii and iii only
D) All i, ii, iii and iv

16. Functions of the management plane related to a system include
i) provision of co-ordination between all planes ii) layer management iii) management functions relating to resources and parameters
A) i and ii only
B) ii and iii only
C) i and iii only
D) All i, ii and iii

17. In ATM, the information is transmitted in the form of small packets of fixed size are called ………..
A) ATM path
B) ATM cell
C) ATM routing
D) ATM follows

18. Which of the following is/are the advantages of virtual path
i) complicated network structure ii) improved network performance and reliability iii) Enhancement in-network services
A) i and ii only
B) ii and iii only
C) i and iii only
D) All i, ii and iii

19. …………….. includes real-time service of ATM service.
A) Constant bit rate
B) Available bit rate
C) Unspecified bit rate
D) Specified bit rate

20. State whether the following statements are True or False.
i) ATM is the next step of packet switching technique ii) ATM allows multiple virtual channels with the data rates iii) Frame relay not allows multiple virtual channels with the data rates
A) i-True, ii-False, iii-True
B) i-False, ii-False, iii-True
C) i-True, ii-True, iii-False
D) i-False, ii-True, iii-True

Answers

1. C) i, ii and iii only
2. C) Frame relay
3. D) Frame relay
4. A) i-True, ii-False, iii-True
5. A) i and ii only
6. C) Frame relay
7. A) X.25
8. D) All i, ii and iii
9. B) X.25
10. C) ATM
11. A) Physical layer
12. B) ATM
13. B) ATM layer
14. D) ATM adaption layer (AAL)
15. A) i, ii and iv only
16. D) All i, ii and iii
17. B) ATM cell
18. B) ii and iii only
19. A) Constant bit rate
20. D) i-False, ii-True, iii-True