CCNA+第四学期章节测试题答案e43.docx

1、CCNA+第四学期章节测试题答案e43Exam Viewer - EWAN Chapter 3 - CCNA Exploration: Accessing the WAN (Version 4.0) Below you will find the assessment items as presented on the exam as well as the scoring rules associated with the item.Cisco Networking Academy content is copyrighted and the unauthorized posting, di

2、stribution or sharing of this exam content is prohibited. 1窗体顶端Which best describes the benefit of using Frame Relay as opposed to a leased line or ISDN service? Customers can define their virtual circuit needs in far greater combinations, with increments as small as 64 kbps. Customers pay for an en

3、d-to-end connection that includes the local loop and the network link. Customers only pay for the local loop and the bandwidth they purchase from the network provider. Connecting new sites requires new lower cost circuit installations when compared to ISDN dialup costs or adding additional hardware

4、for leased service. 窗体底端ObservableDescriptionMax Value1correctness of response2 points for Option 30 points for any other option 22窗体顶端What two methods does Frame Relay technology use to process frames that contain errors? (Choose two.) Frame Relay services depend on the upper layer protocols to han

5、dle error recovery. It requires the receiving device to request that the sender retransmit erroneous frames. FECN, BECN, and DE bits are set in the frames to minimize errors. The receiving device drops any frames that contain errors without notifying the sender. The frame relay switch notifies the s

6、ender that errors were detected. 窗体底端ObservableDescriptionMax Value1correctness of responseOption 1 and Option 4 are correct.1 point for each correct option.0 points if more options are selected than required. 23窗体顶端What best describes the use of a data-link connection identifier (DLCI)? local addre

7、ss identifying a destination router across a Frame Relay network locally significant address used to identify a virtual circuit logical address identifying the interface between a router and a Frame Relay switch logical address used to identify the DCE 窗体底端ObservableDescriptionMax Value1correctness

8、of response2 points for Option 20 points for any other option 24窗体顶端What is created between two DTEs in a Frame Relay network? ISDN circuit limited access circuit switched parallel circuit virtual circuit 窗体底端ObservableDescriptionMax Value1correctness of response2 points for Option 40 points for any

9、 other option 25窗体顶端Which two items allow the router to map data link layer addresses to network layer addresses in a Frame Relay network? (Choose two.) ARP RARP Proxy ARP Inverse ARP LMI status messages ICMP 窗体底端ObservableDescriptionMax Value1correctness of responseOption 4 and Option 5 are correct

10、.1 point for each correct option.0 points if more options are selected than required. 26窗体顶端Refer to the exhibit. A ping is sent to address 192.168.50.10 from the Peanut router. Which DLCI will be used to send the ping? 110 115 220 225 窗体底端ObservableDescriptionMax Value1correctness of response2 poin

11、ts for Option 10 points for any other option 27窗体顶端Refer to the exhibit. What effect does the point-to-point configuration on subinterface S0/0.110 have on the operation of the router? It helps to conserve IP addresses. It establishes multiple PVC connections to multiple physical interfaces. It elim

12、inates split horizon issues without increasing the likelihood of routing loops. It requires the configuration of the encapsulation command on the subinterface. 窗体底端ObservableDescriptionMax Value1correctness of response2 points for Option 30 points for any other option 28窗体顶端Which three actions might

13、 a Frame Relay switch perform when it detects an excessive build-up of frames in its queue? (Choose three.) puts a hold on accepting frames in excess of the CIR drops frames from the queue that have the DE bit set reduces the number of frames it sends over the link re-negotiates flow control with th

14、e connected device sets the FECN bit on all frames it receives on the congested link sets the BECN bit on all frames it places on the congested link 窗体底端ObservableDescriptionMax Value1correctness of responseOption 2, Option 5, and Option 6 are correct.1 point for each correct option.0 points if more

15、 options are selected than required. 39窗体顶端Refer to the exhibit. Which two statements are true given the output shown? (Choose two.) The IP address of the local Frame Relay interface is 172.16.1.4. The local DLCI number is 401. Inverse ARP is being used on this connection. This interface is in the a

16、ctive state and in the process of negotiating configuration parameters. Multicast is not enabled on this connection. 窗体底端ObservableDescriptionMax Value1correctness of responseOption 2 and Option 3 are correct.1 point for each correct option.0 points if more options are selected than required. 210窗体顶

17、端Which Frame Relay topology is a compromise of costs, reliability, and complexity when the WAN contains one headquarters site, 40 regional sites, and several sites within each regional site? star full mesh partial mesh point-to-multipoint point-to-point 窗体底端ObservableDescriptionMax Value1correctness

18、 of response2 points for Option 30 points for any other option 211窗体顶端Refer to the exhibit. What can be determined about the Frame Relay switch from the output shown? It is currently not transmitting data. It is in the process of establishing the PVC. It has put a hold on processing frames in excess

19、 of the CIR. It is experiencing congestion. 窗体底端ObservableDescriptionMax Value1correctness of response2 points for Option 40 points for any other option 212窗体顶端Refer to the exhibit. Frame Relay connectivity has been configured in the network and OSPF is used as the routing protocol. Router R1 can su

20、ccessfully ping the router R2 serial interface. When R1 attempts to ping network 192.168.3.0/24 the ping fails. What additional configuration should be applied on all routers to remedy the problem? Add the broadcast keyword in the Frame Relay map command on both routers. Issue the frame-relay interf

21、ace-dlci command in addition to the frame-relay map command on both router interfaces. Remove the frame-relay map command and replace with the frame-relay interface-dlci command on both router interfaces. Apply the no frame-relay inverse-arp command on both router interfaces. 窗体底端ObservableDescripti

22、onMax Value1correctness of response2 points for Option 10 points for any other option 213窗体顶端Which statement about Frame Relay subinterfaces is correct? Multipoint interfaces will automatically forward routing broadcasts but will consume more IP addresses than point-to-point subinterfaces will consu

23、me. Point-to-point subinterfaces act like leased lines and eliminate split-horizon routing issues. Interfaces with multiple PVCs require a separate subinterface for each PVC. Multipoint configurations cannot use subinterfaces. 窗体底端ObservableDescriptionMax Value1correctness of response2 points for Op

24、tion 20 points for any other option 214窗体顶端Refer to the exhibit. You are a network administrator who has been tasked with completing the Frame Relay topology that interconnects two remote sites. Router HQ belongs to both the 172.16.1.0/24 and 172.16.2.0/24 subnets with IP addresses of 172.16.1.3 and

25、 172.16.2.3 respectively. Traffic between R1 and R2 must travel through HQ first. How should the serial interface on HQ be configured to complete the topology? one multipoint subinterface two point-to-point subinterfaces with the physical interface configured with two ip addresses one IP address on

26、a point-to-point subinterface and one IP address on the physical interface 窗体底端ObservableDescriptionMax Value1correctness of response2 points for Option 20 points for any other option 215窗体顶端What consideration must be taken into account if RIP is used on Frame Relay multiaccess networks? To forward

27、routing updates, address-to-DLCI mapping must be done via the use of the frame-relay map command coupled with the broadcast keyword. Inverse ARP must be enabled to turn routing update broadcasts into unicast traffic that can be propagated to other Frame Relay nodes. Because broadcast traffic is not

28、supported, RIPv1 cannot be implemented on Frame Relay networks. To forward broadcast routing updates, dynamic mapping must be enabled. 窗体底端ObservableDescriptionMax Value1correctness of response2 points for Option 10 points for any other option 216窗体顶端Refer to the exhibit. Which statement explains wh

29、y the Frame Relay connection between R1 and R2 is failing? Split horizon must be disabled. The LMI type must be specified. Logical subinterfaces must be used instead. The frame-relay map commands are using incorrect DLCIs. 窗体底端ObservableDescriptionMax Value1correctness of response2 points for Option 40 points for any other option 217窗体顶端Refer to the exhibit. Rou