多項(xiàng)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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1.單項(xiàng)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.

2.多項(xiàng)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

3.多項(xiàng)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

4.單項(xiàng)選擇題A router receives information about network 192.168.10.0/24 from multiple sources. What will the router consider the most reliable information about the path to that network（）。

A.a directly connected interface with an address of 192.168.10.254/24
B.a static route to network 192.168.10.0/24
C.a RIP update for network 192.168.10.0/24
D.an OSPF update for network 192.168.0.0/16
E.a default route with a next hop address of 192.168.10.1
F.a static route to network 192.168.10.0/24 with a local serial interface configured as the next hop

5.多項(xiàng)選擇題Which of the following describes the roles of devices in a WAN (Choose three.)（）。

A.A CSU/DSU terminates a digital local loop.
B.A modem terminates a digital local loop.
C.A CSU/DSU terminates an analog local loop.
D.A modem terminates an analog local loop.
E.A router is commonly considered a DTE device.
F.A router is commonly considered a DCE device.

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