单项选择题

Which of the following is the default port for telnet？（）

A.20
B.21
C.22
D.23

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单项选择题

Given the following routing table entries， which of the following will the next-hop address be for a packet destined for the address 192.168.1.203？（）

A.77.0.5.5
B.40.40.0.254
C.66.40.90.121
D.72.40.91.1

多项选择题

A.1000Base-CX
B.1000Base-TX
C.1000Base-SX
D.10Base-T
E.1000Base-T
F.1000Base-LX

单项选择题

A.Hub
B.Switch
C.Router
D.Bridge