一、单选题,每题仅一个正确答案,每题 1.5 分,共 30 分：[ ］1。 Which is not a network communication links?D。Subway［ ］2。Which is not the types of protocol data unit in TCP/IP?C.datetime［ ］3.In which state the delays of router become small？A. La/R ~ 0[ ］4.When congest occur in network, which delay become large？B。queuing delay[ ］5。Application protocol define the types of messages exchanged, which are： A。request ＆ response messages［ ］6。Which version of hypertext transfer protocol are used in default mode now？C。HTTP 1。1［ ］7。The Http client works on which port:C.TCP port above 1024［ ］8.To indicates end of message in Http， we can use：A。Carriage return and line feed［ ]9。Which is not an email protocol：C.Emule［ ］10。 TCP retransmission can not be caused by：D。 ACK[ ]11. Which of the following measures the time from one segment transmission to ACK receipt：A. sample RTT[ ］12。 Which event will not be in TCP Receiver：C。Arrival of out-of-order segment higher-than-expect seq. ＃ . No gap detected.［ ]13.TCP Flow Control is a speed-matching service for matching： A。the sender rate to the receiving application’s drain rate[ ］14.Which one is not the mechanism of TCP Congestion Control:C.FIFO[ ］15。In RDT protocol, which can increase the use of physical resources:C.Pipeline［ ]16. Which one is not the Key Network-Layer Functions in today’s internet：C。 Connection setup［ ]17. Which of the following IP address belongs to category C address?A. 210。98。3.4 ［ ]18。Network address translation implement in NAT router， it must use：C．NAT translation table[ ]19。 ICMP do not error reporting about:D. unknown username［ ］20. In Ethernet’s CSMA/CD Jam Signal make sure： A。other transmitters are aware ...
