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單項選擇題 Refer to the exhibit.Which statement describes DLCI 17？（）

A.DLCI 17 describes the ISDN circuit between R2 and R3.
B.DLCI17 describes a PVC on R2.It cannot be used on R3 or R1.
C.DLCI17 is the Layer 2 address used by R2 to describe a PVC to R3.
D.DLCI17 describes the dial-up circuit from R2 and R3 to the service provider.

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1.單項選擇題Which command shows your active Telnet connections?（）

A.show session
B.show cdp neighbors
C.show users
D.show queue

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2.多項選擇題Which two statements describe the advantages to the use of RIP over the use of OSPF？（）

A.RIP requires less time to converge
B.RIP uses less bandwidth
C.RIP is less complex to configure
D.RIP demands fewer router resources
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3.單項選擇題Which commands is necessary to permit SSH or Telnet access to a cisco switch that is otherwise configured for these vty line protocols?（）

A.transport type all
B.transport output all
C.transport preferred all
D.transport input all

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4.單項選擇題On the network 131.1.123.0/27, what is the last IP address that can be assigned to a host?（）

A.131.1.123.30
B.131.1.123.31
C.131.1.123.32
D.131.1.123.33

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5.單項選擇題What will an Ethernet switch do if it receives a unicast frame with a destination MAC that is listed in the switch table（）。

A.The switch will not forward unicast frames.
B.The switch will forward the frame to a specific port.
C.The switch will return a copy of the frame out the source port.
D.The switch will remove the destination MAC from the switch table.
E.The switch will forward the frame to all ports except the port on which it was received.

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