| 71. | Frame boundaries are recognized and created by .................... |
| a. | Application layer |
| b. | Data Link layer |
| c. | Session layer |
| d. | Network layer |
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Answer: (c).Session layer
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| 72. | Token Management is the function of .................... |
| a. | Application layer |
| b. | Data Link layer |
| c. | Session layer |
| d. | Network layer |
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Answer: (d).Network layer
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| 73. | The function of Physical Layer? |
| a. | Error correction and Detection |
| b. | Piggybacking |
| c. | Flow Control |
| d. | Determine number of volts to represent 1 or 0 |
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Answer: (d).Determine number of volts to represent 1 or 0
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| 74. | As the data packet moves from the lower to the upper layers then headers are? |
| a. | added |
| b. | subtracted |
| c. | rearranged |
| d. | modified |
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Answer: (a).added
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| 75. | In OSI network architecture, the routing is performed by .................. |
| a. | network layer |
| b. | data link layer |
| c. | transport layer |
| d. | session layer |
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Answer: (a).network layer
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| 76. | How many OSI layers are covered in the X.25 standard? |
| a. | Two |
| b. | Three |
| c. | Seven |
| d. | Six |
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Answer: (b).Three
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| 77. | Layer one of the OSI model is ................. |
| a. | physical layer |
| b. | link layer |
| c. | transport layer |
| d. | internet work layer |
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Answer: (a).physical layer
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| 78. | The X.25 standard specifies a ............... |
| a. | technique for start-stop data |
| b. | technique for dial access |
| c. | DTE/DCE interface |
| d. | None of above |
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Answer: (c).DTE/DCE interface
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| 79. | Which of the following are session layer check points? |
| 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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Answer: (a).allow just a portion of a file to be resent
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| 80. | Which of the following technique is used for encapsulation? |
| a. | one of the pieces that results when an IP gateway divides an IP datagram into smaller pieces for transmission across a network that cannot handle the original datagram size |
| b. | a technique used by protocols in which a lower level protocol accepts a message from a higher level protocol and places it in the data portion of the low level frame |
| c. | a technique used in best-effort delivery systems to avoid endlessly looping packets |
| d. | all of the above |
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Answer: (b).a technique used by protocols in which a lower level protocol accepts a message from a higher level protocol and places it in the data portion of the low level frame
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