单项选择题

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

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单项选择题

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

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

单项选择题

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.

问答题

问10.1.1.0/24 10.1.2.0/24可以将这两条路由汇总成最短的掩码是什么？