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| 1 | |
One of the main duties of the transport layer is to provide ____________ communication. |
| | A) | node-to-node |
| | B) | host-to-host |
| | C) | process-to-process |
| | D) | None of the choices are correct |
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| 2 | |
A client program normally uses ____________ port number. A server program normally uses __________ port number. |
| | A) | a well-known; an ephemeral |
| | B) | an ephemeral; a well-known |
| | C) | a private; a well-known |
| | D) | None of the choices are correct |
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| 3 | |
A socket address is a combination of __________. |
| | A) | a MAC address and a logical address |
| | B) | a MAC address and a port number |
| | C) | a user-specific address and a logical address |
| | D) | None of the choices are correct |
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| 4 | |
______________ means accepting items from more than one source. ______________ means delivering items to more than one source. |
| | A) | Demultiplexing; Multiplexing |
| | B) | Multiplexing; Demultiplexing |
| | C) | Encapsulation; Decapsulation |
| | D) | Pulling; Pushing |
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| 5 | |
________ means the producer delivers the items when they are produced. _______ means the consumer takes the items when it is ready to do so. |
| | A) | Pushing; Pulling |
| | B) | Pulling; Pushing |
| | C) | Forwarding; Accepting |
| | D) | None of the choices are correct |
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| 6 | |
In the stop-and-wait protocol, the maximum send window size is ______ and the maximum receive window size is _______, where m is the number of bits in the sequence. |
| | A) | 1; 1 |
| | B) | 2m; 1 |
| | C) | 1; 2m |
| | D) | 2m; 2m |
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| 7 | |
In the Go-Back-N protocol, the maximum send window size is ______ and the maximum receive window size is _______, where m is related to the number of bits in the sequence number. |
| | A) | 1; 1 |
| | B) | 1; 2m |
| | C) | 2m − 1; 1 |
| | D) | 2m − 1; 2m − 1 |
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| 8 | |
In the selective-repeat protocol, the maximum send window size is ______ and the maximum receive window size is _______, where m is the number of bits in the sequence. |
| | A) | 1; 1 |
| | B) | 1; 2m − 1 |
| | C) | 2m − 1; 1 |
| | D) | 2m − 1; 2m − 1 |
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| 9 | |
UDP is a ________________transport protocol. |
| | A) | connectionless, reliable |
| | B) | connection-oriented, unreliable |
| | C) | connectionless, unreliable |
| | D) | None of the choices are correct |
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| 10 | |
UDP is an acronym for _______. |
| | A) | User Delivery Protocol |
| | B) | User Datagram Procedure |
| | C) | User Datagram Protocol |
| | D) | None of the choices are correct |
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| 11 | |
At the transport layer, to define the processes, we need two identifiers called ____________. |
| | A) | logical addresses |
| | B) | physical addresses |
| | C) | port addresses |
| | D) | None of the choices are correct |
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| 12 | |
The ports ranging from 0 to 1,023 are called the ___________ ports. The ports ranging from 1,024 to 49,151 are called ___________ ports. The ports ranging from 49,152 to 65,535 are called the ___________ ports. |
| | A) | well-known; registered; dynamic or private |
| | B) | registered; dynamic or private; well-known |
| | C) | private or dynamic; well-known; registered |
| | D) | private or dynamic; registered; well-known |
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| 13 | |
UDP and TCP are two protocols at the ___________ layer. |
| | A) | data-link |
| | B) | network |
| | C) | transport |
| | D) | application |
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| 14 | |
A port number is _______ bits long. |
| | A) | 8 |
| | B) | 16 |
| | C) | 32 |
| | D) | 64 |
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| 15 | |
Communication at the transport layer is _________. |
| | A) | node-to-node |
| | B) | end-to-end |
| | C) | node-to-host |
| | D) | host-to-node |
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| 16 | |
In Go-Back-N, the values of Sf = 3 and Sn = 7, after receiving a packet with ackNo = 6, the value of Sf is _______________. |
| | A) | 6 |
| | B) | 7 |
| | C) | 5 |
| | D) | None of the choices are correct |
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| 17 | |
In Go-Back-N, the values of Sf = 3 and Sn = 7, after receiving a packet with ackNo = 6, the value of Sn is _______________. |
| | A) | 6 |
| | B) | 7 |
| | C) | 5 |
| | D) | None of the choices are correct |
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| 18 | |
In Go-Back-N, the values of Sf = 3 and Sn = 7, after receiving a packet with ackNo = 5, the window ________. |
| | A) | slides two slots |
| | B) | slides one slot |
| | C) | slides three slots |
| | D) | does not slide |
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| 19 | |
In Selective Repeat, the values of Sf = 3 and Sn = 7, after receiving a packet with ackNo = 5, the window ________. |
| | A) | slides two slots |
| | B) | slides one slot |
| | C) | slides three slots |
| | D) | does not slide |
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| 20 | |
In Selective Repeat, when a timeout occurs, the timer is ________. |
| | A) | stopped |
| | B) | started |
| | C) | reset (stopped and started) |
| | D) | None of the choices are correct |
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