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 :

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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.

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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.

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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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