计算机网络英文题库(附答案)chapter3.docx

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 ’sesicso_p___ 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