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單項選擇題Why will a switch never learn a broadcast address（）。

A.Broadcasts only use network layer addressing.
B.A broadcast frame is never forwarded by a switch.
C.A broadcast address will never be the source address of a frame.
D.Broadcast addresses use an incorrect format for the switching table.
E.Broadcast frames are never sent to switches.

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1.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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2.多項選擇題As a frame leaves a Layer 3 device, the Layer 2 encapsulation information is changed from what it was when it entered the devicE.For what two reasons can this happen? （）

A.The data is moving from 10BASE-TX to 100BASE-TX.
B.The WAN encapsulation type has changed.
C.The data format has changed from analog to digital.
D.The source and destination hosts are in the same subnet.
E.The source and destination MAC addresses have changed.

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3.單項選擇題Which additional configuration step is necessary in order to connect to an access point that has SSID broadcasting disabled（）。

A.Set the SSID value in the client software to public.
B.Configure open authentication on the AP and the client.
C.Set the SSID value on the client to the SSID configured on the AP.
D.Configure MAC address filtering to permit the client to connect to the AP.

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4.多項選擇題At which layers of the OSI model do WANs operate (Choose two.)（）。

A.application layer
B.session layer
C.transport layer
D.network layer
E.datalink layer
F.physical layer

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5.多項選擇題Which three Layer 2 encapsulation types would be used on a WAN rather than a LAN (Choose three.)（）。

A.HDLC
B.Ethernet
C.Token Ring
D.PPP
E.FDDI
F.Frame Relay

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