题目内容

The service of TCP is（）.

A. connectionless transmission
B. unreliable data transmission
C. datagram
D. reliable data transmission

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The UDP segment includes （）.

A. checksum
B. receive window
C. sequence number
D. acknowledgement number

The application of ( ) is loss-tolerant.

A. stored audio/video
B. file transfer
C. Web documents
D. text messaging

Which of the following is the default port number of TCP control connection in FTP?

A. 20
B. 21
C. 25
D. 80

[ 判断题 ] C1计算机网络与因特网 (2分)Web服务器是一种端系统,FTP服务器不是一种端系统。 ( )

A. 对
B. 错