Computer Networks - Computer Networks Section 4

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11. Data link layer retransmits the damaged frames in most networks. If probability of a frame's being damaged is p, then what is the mean number of transmissions required to send a frame if acknowledgements are never lost ?

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Option : B
Explanation :

12. Which layer functions as a liaison between user support layers and network support layers ?

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Option : C
Explanation : 7 layer of 081 model are divided into the following groups :
Physical, datalink, network transport, - Network support layers
Application, Presentation, Session - User support layers.

13. Which of the following are session layer checkpoints?

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Option : A
Explanation : The purpose of check points or synchronization is allow just a portion of file to be resent. To avoid the retransmission of frames, session layer adds check points to the data unit.

14. In session layer, during data transfer, the data stream responsible for the control purpose (i.e. control of the session layer itself) is

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Option : C
Explanation : Any layer can transfer data basing on its bandwidth (data handling capacity) i.e. it is limited to certain extent, i.e. capability data.

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Computer Networks Section 4

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