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 ?
| A. | K / K - P |
| B. | 1 / K - P |
| C. | K / K(1 + p) |
| D. | p / K + 1 |
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Option: B Explanation : Click on Discuss to view users comments. |
Which layer functions as a liaison between user support layers and network support layers ?
| A. | Network layer |
| B. | Physical layer |
| C. | Transport layer |
| D. | Session layer |
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Option: C Explanation :
7 layer of 081 model are divided into the following groups : Click on Discuss to view users comments. |
Which of the following are session layer checkpoints?
| A. | Allow just a portion of a file to be resent |
| B. | Detect and recover errors |
| C. | Control the addition of headers |
| D. | Are involved in dialog control |
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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. Click on Discuss to view users comments. |
In session layer, during data transfer, the data stream responsible for the control purpose (i.e. control of the session layer itself) is
| A. | regular data |
| B. | typed data |
| C. | capability data |
| D. | expedited data |
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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. Click on Discuss to view users comments. |
