多项选择题

Which fields are included in the TCP header?（）

A. Source Port
B. Acknowledgement Number
C. Request Number
D. Destination Address
E. Window
F. Data

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单项选择题

How many simultaneous Telnet sessions does a Cisco router support by default?（）

A.1
B.2
C.3
D.4
E.5
F.6

单项选择题

Which of the following protocols use both TCP and UDP ports?（）

A. FTP
B. SMTP
C. Telnet
D. DNS
E. All of the above

多项选择题

What statements are true regarding ICMP packets?（）

A. They acknowledge receipt of TCP segments.
B. They guarantee datagram delivery.
C. They can provide hosts with information about network problems.
D. They are encapsulated within IP datagrams.
E. They are encapsulated within UDP datagrams.