問答題問有哪些路由協(xié)議在路由條目發(fā)生變化時只做部分更新，并且使用比較低的鏈路帶寬？

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1.單項選擇題Network A has a spanning-tree problem in which the traffic is selecting a longer path. How is the path cost calculated？（）

A.number of hops
B.priority of the bridge
C.interface bandwidth
D.interface delay
E.None of the above

2.單項選擇題

Refer to the exhibit. Which switching feature is being tested?（）

A.loop guard
B.PortFast
C.root guard
D.BDPU guard

3.單項選擇題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.

5.多項選擇題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.