思科網(wǎng)絡(luò)學(xué)院 CCNA 4 練習(xí)題和答案 English FormD EWAN v4

1、思科網(wǎng)絡(luò)學(xué)院 CCNA 4 練習(xí)題和答案 English FormD EWAN v4.0 Chapter 1.2.4 WAN Switching Concepts Assessment Item:What is an advantage of packet-switched technology over circuit-switched technology?Packet-switched networks are less susceptible to jitter than circuit-switched networks are. Packet-switched networks c

2、an efficiently use multiple routes inside a service provider network. Packet-switched networks do not require an expensive permanent connection to each endpoint. Packet-switched networks usually experience lower latency than circuit-switched networks experience. Reset View Learner ResponseScoring Ru

3、le for: correctness of response 2 points for Option 2This item references content from the following areas:CCNA Exploration1.2.3 WAN Data Link Layer Concepts Assessment Item:Which statement about WAN protocols is correct?ATM differs from other WAN protocols in that it uses variably sized packets. Mo

4、st WAN protocols use HDLC or a variant of HDLC as a framing mechanism. The frame header consists of the frame check sequence and cyclic redundancy check. ISDN differs from Frame Relay, HDLC, and ATM in that it is packet-switched rather than circuit-switched technology. ResetScoring Rule for: correct

5、ness of response 2 points for Option 2This item references content from the following areas:CCNA Exploration1.2.4 WAN Switching Concepts Assessment Item:Why is the call setup time of a circuit-switched WAN implementation considered a drawback?Routing protocols are incompatible with this function. It

6、 restricts the communication sent to voice traffic only. A telephone must be used to initially start transferring data. Data cannot be transferred until a circuit has been established. ResetScoring Rule for: correctness of response 2 points for Option 4Assessment Item:Which statement is true about t

7、he differences between a WAN and a LAN?WANs generally support higher bandwidth than LANs support. A WAN link typically traverses shorter geographic distances than a LAN link traverses. A WAN often relies on the services of carriers, such as telephone or cable companies, but a LAN does not. All WAN i

8、mplementations generally use the same Layer 2 protocol but there are many accepted LAN Layer 2 protocols in use. ResetScoring Rule for: correctness of response 2 points for Option 31.2.2 WAN Physical Layer Concepts Assessment Item:Which statement is true about data connectivity between a customer an

9、d a service provider?Normally the CSU/DSU is the designated demarcation point for the service provider but not the customer. The segment between the demarcation point and the central office is known as the "last mile." The local loop is the segment between the CSU/DSU and the serial port o

10、n a router. Putting data on the local loop is the responsibility of the DTE. ResetScoring Rule for: correctness of response 2 points for Option 2 1.1.3 The Evolving Network Model Assessment Item:Which statement is true of the functionality of the layers in the hierarchical network model?The purpose

11、of the access layer is to provide very high bandwidth communications between network devices. Most security screening to prevent unauthorized entry to the network happens at the core layer. Untrusted external connections are segmented from the rest of the network at all three levels. The distributio

12、n layer aggregates WAN connections at the edge of the campus. ResetScoring Rule for: correctness of response 2 points for Option 41.2.2 WAN Physical Layer Concepts Assessment Item:Which two devices are commonly used as data communications equipment? (Choose two.)modem router CSU/DSU ISDN switch Ethe

13、rnet switch ResetScoring Rule for: correctness of response Option 1 and Option 3 are correct.This item references content from the following areas:CCNA Exploration1.3.4 Packet Swtiched Connection Options Assessment Item:A company needs a WAN connection that is capable of transferring voice, video, a

14、nd data at a minimum data rate of 155 Mbps. Which WAN connection is the best choice?X.25 DSL ATM ISDN BRI ISDN PRI ResetScoring Rule for: correctness of response 2 points for Option 3 This item references content from the following areas:CCNA Exploration1.2.4 WAN Switching Concepts Assessment Item:W

15、hich switching type will allow the communication devices in the provider network to be shared and only allocated to an individual subscriber during data transfer?circuit-switched dedicated switched lines frame-switched packet-switched Reset View Learner ResponseScoring Rule for: correctness of respo

16、nse 2 points for Option 4This item references content from the following areas:CCNA Exploration1.2.2 WAN Physical Layer Concepts Assessment Item:Which term describes a device that will put data on the local loop?DLCI DTE DCE BRI PRI ResetScoring Rule for: correctness of response 2 points for Option

17、3 This item references content from the following areas:CCNA Exploration1.2.2 WAN Physical Layer Concepts Assessment Item:For digital lines, which device is used to establish the communications link between the customer equipment and the local loop?CSU/DSU Frame Relay switch ISDN switch modem PBX sw

18、itch ResetScoring Rule for: correctness of response 2 points for Option 1This item references content from the following areas:CCNA Exploration1.3.3 Circuit Switched Connection Options Assessment Item:A U.S. company requires a WAN connection used only to transfer sales data from individual stores to

19、 the home office. All transfers will occur after business hours. The required bandwidth for this connection is estimated to be less than 38 kbps. Which type of connection requires the least investment for this company?ATM ISDN analog dialup T1 Leased Line ResetScoring Rule for: correctness of respon

20、se 2 points for Option 3This item references content from the following areas:CCNA Exploration1.3.5 Internet Connection Options Assessment Item:What type of connectivity is established when VPNs are used from the remote site to the private network?PVCs DLCIs tunnels virtual circuits dedicated Layer

21、2 links Reset View Learner ResponseScoring Rule for: correctness of response 2 points for Option 3This item references content from the following areas:CCNA Exploration1.3.5 Internet Connection Options Assessment Item:What can cause a reduction in available bandwidth on a cable broadband connection?

22、smaller cells number of subscribers committed information rate distance from the central office of the provider ResetScoring Rule for: correctness of response 2 points for Option 2This item references content from the following areas:CCNA Exploration1.3.3 Circuit Switched Connection Options Assessme

23、nt Item:What three terms are associated with ISDN PRI? (Choose three.)DLCI circuit switching packet switching data bearer channels switched virtual circuits time-division multiplexing ResetScoring Rule for: correctness of response Option 2, Option 4, and Option 6 are correct.1 point for each correct

24、 option This item references content from the following areas:CCNA Exploration1.3.3 Circuit Switched Connection Options Assessment Item:What are two advantages of an analog PSTN WAN connection? (Choose two.)low cost availability traffic encryption available bandwidth support for voice and video Rese

25、tScoring Rule for: correctness of response Option 1 and Option 2 are correct This item references content from the following areas:CCNA Exploration1.3.4 Packet Swtiched Connection Options Assessment Item:Which WAN technology uses a fixed payload of 48 bytes and is transported across both switched an

26、d permanent virtual circuits?ATM ISDN Frame Relay metro Ethernet Reset View Learner ResponseScoring Rule for: correctness of response 2 points for Option 1This item references content from the following areas:CCNA Exploration1.3.4 Packet Swtiched Connection Options Assessment Item:Which three featur

27、es are identified with Frame Relay connections? (Choose three.)CIR DLCI DSLAM PVC SPID 53-byte cells ResetScoring Rule for: correctness of response Option 1, Option 2, and Option 4 are correct This item references content from the following areas:CCNA Exploration1.3.5 Internet Connection Options Ass

28、essment Item:Which packet-switched WAN technology offers high-bandwidth connectivity capable of managing data, voice, and video all on the same infrastructure?Time Division Multiplexing (TDM) metro Ethernet Integrated Services Digital Network (ISDN) Public Switched Telephone Network (PSTN) Reset Vie

29、w Learner ResponseScoring Rule for: correctness of response 2 points for Option 2This item references content from the following areas:CCNA Exploration1.2.2 WAN Physical Layer Concepts Assessment Item:Which networking device is typically used to concentrate the dial-in and dial-out traffic of multip

30、le users to and from a network?core router access server Frame Relay switch ATM switch ResetScoring Rule for: correctness of response 2 points for Option 2This item references content from the following areas:CCNA Exploration1.2.1 WAN Technology Overview Assessment Item:Which three WAN devices can b

31、e found in the cloud? (Choose three.)ATM switches core routers CSU/DSU Ethernet switches Frame Relay switches repeaters ResetScoring Rule for: correctness of response Option 1, Option 2, and Option 5 are correct.1 point for each correct option.This item references content from the following areas:CC

32、NA Exploration1.2.1 WAN Technology Overview Assessment Item:At which two layers of the OSI model does a WAN operate? (Choose two.)Physical Layer Data Link Layer Network Layer Transport Layer Presentation Layer Application Layer ResetScoring Rule for: correctness of response Option 1 and Option 2 are

33、 correct.思科網(wǎng)絡(luò)學(xué)院 CCNA4的練習(xí)題和答案 English FormC EWAN v4.0 Chapter 8This item references content from the following areas:CCNA Exploration8.2.5 Gathering Symptoms Assessment Item:Which three approaches should be used when attempting to gather data from users for troubleshooting? (Choose three.)Determine f

34、ault. Get to know the user to build trust. Obtain information by asking simple pertinent questions. Impress the user with use of technical language and skills. Determine if the problem is related to time or a specific event. Determine if the user can re-create the problem or events leading to the pr

35、oblem. Reset Scoring Rule for:   correctness of response Option 3, Option 5, and Option 6 are correct.1 point for each correct option.0 points if more options are selected tha This item references content from the following areas:CCNA Exploration8.1.2 Documenting Your Network Assessment It

36、em:Information about which OSI layers of connected Cisco devices can be verified with the show cdp neighbors command?All layers Layer 1, Layer 2, and Layer 3 Layer 1, Layer 2, Layer 3, and Layer 4 Layer 6 and Layer 7 Reset Scoring Rule for:   correctness of response 2 points for Option 20

37、points for any other option This item references content from the following areas:CCNA Exploration8.4.5 Transport Layer Troubleshooting 8.4.6 Application Layer Troubleshooting Assessment Item:A network administrator has received complaints that users on a local LAN can retrieve e-mail from a remote

38、e-mail server but are unable to open web pages on the same server. Services at which two layers of the OSI model should be investigated during the troubleshooting process? (Choose two.)physical layer data link layer network layer transport layer application layer Reset Scoring Rule for:  

39、correctness of response Option 4 and Option 5 are correct.1 point for each correct option.0 points if more options are selected than required. Max Value = 2 This item references content from the following areas:CCNA Exploration8.4.5 Transport Layer Troubleshooting Assessment Item:What combination of

40、 IP address and wildcard mask should be used to specify only the last 8 addresses in the subnet 2/28?2 2 5 0 0 5 Reset    View Learner Response Scoring Rule for:   correctness of response 2

41、points for Option 3 Encapsulation errors from mismatched WAN protocols on a serial link between two routers indicate a problem at which OSI layer?physical data link network transport Reset Scoring Rule for:   correctness of response 2 points for Option 20 points for any other option This i

42、tem references content from the following areas:CCNA Exploration8.4.2 Physical Layer Troubleshooting Assessment Item:Users are complaining of very long wait times to access resources on the network. The show interface command reveals collision counts far above the network baseline. At which OSI laye

43、r should the administrator begin troubleshooting?application transport network data link physical Reset    View Learner Response Scoring Rule for:   correctness of response 2 points for Option 50 points for any other option Refer to the exhibit. Users at Branch B are reporti

44、ng trouble accessing a corporate website running on a server that is located at HQ. HQ and Branch A users can access the website. R3 is able to ping successfully but not . The users at Branch B can access servers at Branch A. Which two statements are true aboutthe troubleshootin

45、g efforts? (Choose two.)The web server should be tested for an application layer problem. Frame Relay at R3 and R2 should be tested to narrow the scope of the problem. The fact that users at Branch A are working normally proves that there is no problem at R2. An ACL entry error could cause the failu

46、re at Layer 4 in either R3 or R2. The successful ping from R3 to R1 proves that the WAN is functioning normally. Therefore, the problem has to be in the upper layers. Reset Scoring Rule for:   correctness of response Option 2 and Option 4 are correct.This item references content from the f

47、ollowing areas:CCNA Exploration8.2.3 General Troubleshooting Procedures Assessment Item:Refer to the exhibit. Which three pieces of information can be determined by analyzing the output shown? (Choose three.)A carrier detect signal is present. Keepalives are being received successfully. Default enca

48、psulation is used on this serial link. Packets passing this interface cannot exceed 1 KB in size. The reliability of this link is very low. The LCP negotiation phase is complete. Reset Scoring Rule for:   correctness of response Option 1, Option 2, and Option 6 are correct This item refere

49、nces content from the following areas:CCNA Exploration8.2.5 Gathering Symptoms Assessment Item:When gathering symptoms for troubleshooting a network problem, which step could result in getting an external administrator involved in the process?narrowing the scope gathering symptoms from suspect devic

50、es analyzing existing symptoms determining ownership Reset    View Learner Response Scoring Rule for:   correctness of response 2 points for Option 4Refer to the exhibit. Users on the Internal LAN are unable to connect to the www server. The network administrator pings the s

51、erver and verifies that NAT is functioning correctly. Which OSI layer should the administrator begin to troubleshoot next?physical data link network application Reset Scoring Rule for:   correctness of response 2 points for Option 40 points for any other option This item references content

52、 from the following areas:CCNA Exploration8.2.6 Troubleshooting Tools Assessment Item:A technician has been asked to troubleshoot an existing switched network but is unable to locate documentation for the VLAN configuration. Which troubleshooting tool allows the technician to map and discover VLAN a

53、nd port assignments?cable analyzer network analyzer protocol analyzer knowledge base Reset Scoring Rule for:   correctness of response 2 points for Option 20 points for any other option Max Value = 2 This item references content from the following areas:CCNA Exploration8.2.6 Troubleshootin

54、g Tools Assessment Item:A technician has been asked to make several changes to the configuration and topology of a network and then determine the outcome of the changes. What tool can be used to determine the overall effect caused by the changes?baselining tool knowledge base protocol analyzer cable

55、 tester Reset Scoring Rule for:   correctness of response 2 points for Option 10 points for any other option Max Value = 2 Which troubleshooting approach is suggested for dealing with a complex problem that is suspected of being caused by faulty network cabling?bottom up top down divide an

56、d conquer middle out Reset    View Learner Response Scoring Rule for:   correctness of response 2 points for Option 18.4.4 Network Layer Troubleshooting Assessment Item:Clients across the company are reporting poor performance across all corporate applications running in the data center. Internet access and app