單項(xiàng)選擇題You are deploying two core switches，one in each building，50 km away from each other. The cross-connection between them will be a Layer 2 2-gigabit EtherChannel with an 802.1Q trunk. You configured it correctly but the link does not come up. The port is in the "admin up" state，and the line protocol is in the "down" state. The fiber link is OK. What would be the most likely reason for the link not to come up？（）

A.The switches are not the same model.
B.You are not using the correct SFP.
C.You are not using correct optical media converters.
D.Configuration should be modified， because the distance is longer.


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1.單項(xiàng)選擇題Customer X has a hub-and-spoke Frame Relay network， with a central office and two branch offices（RemoteA and RemoteB）. Each location has only one physical link to the Frame Relay cloud and RemoteB has a router that is not a Cisco router. Since the installation，there is no connectivity between RemoteB and the central office. What is a possible solution to this issue？（）

A.Because Frame Relay IETF encapsulation is only configurable at interface level， you must use IETF encapsulation on all routers.
B.This is not a possible scenario. A dedicated Frame Relay link to RemoteB is mandatory at the central office.
C.The router at RemoteB must be replaced by a Cisco router.
D.Use Frame Relay IETF encapsulation on a per-VC basis on the central office router.
E.There is a problem in the Frame Relay cloud， because Cisco routers are compatible with IETF Frame Relay.

3.單項(xiàng)選擇題What is an important consideration that should be taken into account when configuring shaped round robin？（）

A.It enables policing.
B.Strict priority is not supported.
C.WRED must be previously enabled.
D.It enables WRR

5.多項(xiàng)選擇題The network administrator wants to enable an EtherChannel between two switches in "on" mode. The administrator connects the cables and enables the interfaces， but while configuring the EtherChannel in the first switch，a spanning-tree loop was detected. Which two of these procedures can avoid this problem？（）

A.Configure the EtherChannel as "desirable" first.
B.Assign all interfaces to the same VLAN.
C.Disable PortFast on the interfaces in the EtherChannels.
D.Disable all interfaces first.
E.Fast Ethernet and Gigabit Ethernet ports cannot be assigned to the same EtherChannel.
F.Fix cabling problems.

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