计算机网络英文题库chapter3

Chapter 3 Transport Layer1。 A transport-layer protocol provides for logical communication between ____.A Application processesB HostsC RoutersD End systems2. Transport-layer protocols run in ____.A ServersB ClientsC RoutersD End systems3. In transport layer ， the send side breaks application messages into ____ ， passes to network layer.A FramesB SegmentsC Data—grams D bit streams4. Services provided by transport layer include ____.A HTTP and FTPB TCP and IPC TCP and UDPD SMTP5. Which of the following services is not provided by TCP? A Delay guarantees and bandwidth guaranteesB Reliable data transfers and flow controlsC Congestion controlsD In-order data transfers6. These two minimal transport-layer services----____ and ____—-—-are the only two services that UDP provides! A process—to-process data delivery， error checkingB congestion control， reliable data transferC flow control, congestion controlD In-order data transfer， error checking7. Port number’s scope is ____ to ____. A 0， 1023B 0, 65535C 0, 127D 0，2558。 The port numbers ranging from ____to ____ are called well—known port number and are restricted.A 0, 1023B 0, 65535C 0, 127D 0，2559. UDP socket identified by two components, they are ____。A source IP addresses and source port numbersB source IP addresses and destination IP addressesC destination IP address and destination port numbersD destination port numbers and source port numbers10。 TCP socket identified by a (an） ____. A 1-tupleB 2-tupleC 3-tupleD 4—tuple11。 Which of the following applications normally uses UDP services？ A SMTPB Streaming multimediaC FTPD HTTP12。 Reliable data transfer protocol over a perfectly reliable channel is____。 A rdt1.0 B rdt2.0 C rdt3。0 D rdt2。1 13. Reliab...