单项选择题

Refer to the exhibit. This exhibit shows the NAT configuration for Router A and the output for a ping issued from device 171.68.200.48 and destined to 172.16.47.142. Based on this information, what change must be made to Router A in order for the ping to work?() 

A.reload the router
B.clear the route cache
C.add a static route
D.configure IP as classless
E.load a newer IOS image


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5.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

6.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

7.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.

9.多项选择题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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