第三章测试1.The POP3 protocol runs over ____ and uses port ____.
A:TCP 110 B:UDP 110 C:UDP 25 D:TCP 25
答案:A
2.____ is most used for error reporting.
A:SMTP B:UDP C:ICMP D:FTP 3.In the following options, which does not use UDP?
A:telnet B:Internet phone C:video conferencingS D:streaming multimedia 4.Internet transport-layer protocols include TCP,IP and UDP.
A:对 B:错 5.TCP sender perceive congestion through a timeout event or a receiving duplicate ACK-s event.
A:错 B:对
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