多项选择题

Which three statements describe the Transmission Control Protocol (TCP)?（）

A.TCP is a transport layer protocol.
B.TCP is faster than the User Datagram Protocol (UDP).
C.TCP provides delivery notification and error checking mechanisms.
D.TCP uses a best effort delivery approach.
E.TCP application examples include HTTP and SMTP.

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单项选择题

You are the network administrator setting up the IP network for a new branch office. You need at least 5 networks with 25 hosts each. You have been allocated a 24 network.Which prefix length will satisfy the given requirements?（）

A./24
B./26
C./27
D./28

多项选择题

Which two statements about subnet masks are true?（）

A.If a bit is turned on (1), the corresponding bit in the IP address is used for the host portion.
B.If a bit is turned off (0), the corresponding bit in the IP address is used for the host portion.
C.If a bit is turned on (1), the corresponding bit in the IP address is used for the network prefix.
D.If a bit is turned off (0), the corresponding bit in the IP address is used for the network prefix.