MCQs on Data Communication Services Part-2

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 as 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 upto 64 kbps  ii) X.25 does not provide flow control   iii) X.25 provides acknowledgement 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 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 acknowledgement 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 includes
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 follow

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 next step of packet switching technique  ii) ATM allows multiple virtual channel 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 
MCQs on Data Communication Services Part-2
2017-01-02T01:00:00-08:00
Shuseel Baral
Multiple Choice Question (MCQ)|Networking|