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

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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.

多项选择题

Which three address ranges are used for internal private address blocks as defined by RFC 1918?（）

A. 0.0.0.0 to 255.255.255
B. 10.0.0.0 to 10.255.255.255
C. 172.16.0.0 to 172.16.255.255
D. 172.16.0.0 to 172.31.255.255
E. 127.0.0.0. to 127.255.255.255
F. 192.168.0.0 to 192.168.255.255
G. 224.0.0.0 to 239.255.255.255