| 31. | The _______ layer links the network support layers and the user support layers. |
| a. | transport |
| b. | network |
| c. | data link |
| d. | session |
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Answer: (a).transport
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| 32. | The session, presentation, and application layers are the ____ support layers. |
| a. | user |
| b. | network |
| c. | both (a) and (b) |
| d. | neither (a) nor (b) |
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Answer: (a).user
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| 33. | The physical, data link, and network layers are the ______ support layers. |
| a. | user |
| b. | network |
| c. | both (a) and (b) |
| d. | neither (a) nor (b) |
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Answer: (b).network
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| 34. | The seven-layer _____ model provides guidelines for the development of universally compatible networking protocols. |
| a. | OSI |
| b. | ISO |
| c. | IEEE |
| d. | none of the above |
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Answer: (a).OSI
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| 35. | The ____ created a model called the Open Systems Interconnection, which allows diverse systems to communicate. |
| a. | OSI |
| b. | ISO |
| c. | IEEE |
| d. | none of the above |
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Answer: (b).ISO
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| 36. | __________ provides full transport layer services to applications. |
| a. | TCP |
| b. | UDP |
| c. | ARP |
| d. | none of the above |
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Answer: (a).TCP
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| 37. | In the OSI model, encryption and decryption are functions of the ________ layer. |
| a. | transport |
| b. | session |
| c. | presentation |
| d. | application |
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Answer: (c).presentation
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| 38. | In the OSI model, what is the main function of the transport layer? |
| a. | node-to-node delivery |
| b. | process-to-process message delivery |
| c. | synchronization |
| d. | updating and maintenance of routing tables |
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Answer: (b).process-to-process message delivery
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| 39. | In the OSI model, when data is transmitted from device A to device B, the header from A's layer 5 is read by B's _______ layer. |
| a. | physical |
| b. | transport |
| c. | session |
| d. | presentation |
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Answer: (c).session
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| 40. | In the OSI model, as a data packet moves from the lower to the upper layers, headers are _______. |
| a. | added |
| b. | removed |
| c. | rearranged |
| d. | modified |
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Answer: (b).removed
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