计算机网络英文题(附答案)chapter3.doc

Chapter 3 Transport Layer 1. A transport-layer protocol provides for logical communication between ____. A Application processes B Hosts C Routers D End systems 2. Transport-layer protocols run in ____. A Servers B Clients C Routers D End systems 3. In transport layer, the send side breaks application messages into ____, passes to network layer. A Frames B Segments C Data-grams D bit streams 4. Services provided by transport layer include ____. A HTTP and FTP B TCP and IP C TCP and UDP D SMTP 5. Which of the following services is not provided by TCP? A Delay guarantees and bandwidth guarantees B Reliable data transfers and flow controls C Congestion controls D In-order data transfers 6. These two minimal transport-layer services____ and ____are the only two services that UDP provides! A process-to-process data delivery, error checking B congestion control, reliable data transfer C flow control, congestion control D In-order data transfer, error checking 7. Port number’s scope is ____ to ____. A 0, 1023 B 0, 65535 C 0, 127 D 0,255 8. The port numbers ranging from ____to ____ are called well-known port number and are restricted. A 0, 1023 B 0, 65535 C 0, 127 D 0,255 9. UDP socket identified by two components, they are ____. A source IP addresses and source port numbers B source IP addresses and destination IP addresses C destination IP address and destination port numbers D destination port numbers and source port numbers 10. TCP socket identified by a (an) ____. A 1-tuple B 2-tuple C 3-tuple D 4-tuple 11. Which of the following applications normally uses UDP services? A SMTP B Streaming multimedia C FTP D HTTP 12.?Reliable?data?transfer?protocol?over?a?perfectly?reliable?channel?is____.?? A??rdt1.0???B??rdt2.0?C??rdt3.0???D??rdt2.1? 13.?Reliable?data?transfer?protocol?over?a?channel?with?bit?errors?and?packet?losses?is?____.? ?A??rdt1.0??B??rdt2.0?C??rdt3.0???D??rdt2.1? 14.?Which?of?the?following?about?reliable?data?t