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 of collision二、多选题，每题有 2-3 个正确答案，请在正确项前...
