ActualTests.Cisco.640-802.Exam.Q.and.A.08.15.08-DDU (1130589), страница 81
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Can you identify the fault onrouter Certkiller 2?A. Link reliability is insufficientB. IPCP is not openC. Incorrect subnet maskD. Incompatible encapsulationE. Bandwidth allocation is too lowF. Incomplete IP addressG. None of the aboveAnswer: DExplanation:HDLC and PPP configuration is straightforward. You just need to be sure to configurethe same WAN data-link protocol on each end of the serial link. Otherwise, the routerswill misinterpret the incoming frames, because each WAN data-link protocol uses adifferent frame format. The routers must match at each end of the private leased line link.Reference: CCNA Self-Study CCNA ICND exam certification Guide (Cisco Press,ISBN 1-58720-083-X) Page 310.QUESTION 714:Two Certkiller buildings are connected together as shown below:Actualtests.com - The Power of Knowing640-802The Certkiller network administrator is in a campus building distant from BuildingB.
The WANRouter is hosting a newly installed WAN link on interface S0/0. Thenew link is not functioning and the administrator needs to determine if the correctcable has been attached to the S0/0 interface. How can the administrator accuratelyverify the correct cable type on S0/0 in the most efficient manner?A. Physically examine the cable between Certkiller 2 S0/0 and the DCEB. Telnet to Certkiller 2 and execute the command show interface S0/0C.
Telnet to Certkiller 2 and execute the command show controller S0/0D. Telnet to Certkiller 2 and execute the command show processes S0/0E. None of the aboveAnswer: CQUESTION 715:Two Certkiller routers are connected via a PPP connection. Which of the followingare key characteristics of this PPP connection? (Choose three)A. PPP can be used over analog circuitsB. PPP encapsulates several routed protocolsC.
PPP maps Layer 2 to Layer 3 addressD. PPP provides error correctionE. PPP supports IP onlyF. PPP provides encryption servicesAnswer: A, B, DQUESTION 716:Actualtests.com - The Power of Knowing640-802In a point to point connection between two Certkiller offices, which PPP subprotocolnegotiates authentication options?A. NCPB. ISDNC. SLIPD.
LCPE. DLCIAnswer: DExplanation:LCP: A method of establishing, configuring, maintaining, and terminating the point-to-pointconnection.Link-establishment phase LCP packets are sent by each PPP device to configure and test thelink. These packets contain a field called the Configuration Option that allows each device to seethe size of the data, compression, and authentication. If no Configuration Option field is present,then the default configurations are used.QUESTION 717:Routers CK1 and CK2 are connected via a private line using PPP. On this link,which of the following options lists the steps in PPP session establishment in thecorrect order?A. network layer protocol phase, optional authentication phase, link establishment phaseB.
link establishment phase, network layer protocol phase, optional authentication phaseC. optional authentication phase, network layer protocol phase, link establishment phaseD. link establishment phase, optional authentication phase, network layer protocol phaseE. network layer protocol phase, link establishment phase, optional authentication phaseF. optional authentication phase, link establishment phase, network layer protocol phaseG. None of the aboveAnswer: DExplanation:According to the related RFC on CHAP: In order to establish communications over apoint-to-point link, each end of the PPP link must first send LCP packets to configure thedata link during Link Establishment phase.
After the link has been established, PPPprovides for an optional Authentication phase before proceeding to the Network-LayerProtocol phase.Reference: http://www.ietf.org/rfc/rfc1994.txtQUESTION 718:Actualtests.com - The Power of Knowing640-802You are about to configure PPP n the interface of a Cisco router. Whichauthentication methods could you use? (Select two answer choices)A. SSLB. SLIPC. PAPD.
LAPBE. CHAPF. VNPAnswer: C, EExplanation:Password Authentication Protocol (PAP) and Challenge Handshake AuthenticationProtocol (CHAP) authenticate the endpoints on either end of a point-to-point serial link.Chap is the preferred method today because the identifying codes flowing over the linkare created using a MD5 one-way hash, which is more secure that the clear-textpasswords sent by PAP.Reference:CCNA Self-Study CCNA ICND exam certification Guide (Cisco Press, ISBN1-58720-083-X) Page 314QUESTION 719:In a lab, two routers are connected directly together using serial interfaces in aback-to-back configuration. No external DCE devices are being used. Whatadditional command is needed to bring this link up?A.
serial upB. clockrateC. clock rateD. dce rateE. dte rateF. None of the aboveAnswer: CExplanation:The clock rate command (two words), is used to provide clocking on a line where noDCE device is located. Clocking must be provided by one end of this link. Normally in apoint to point HDLC or PPP connection the clock rate is supplied by the networkprovider.Incorrect Answers:Actualtests.com - The Power of Knowing640-802A. This is an invalid commandB. This command will not work.
The clock rate command must use two words.D, E: These are invalid commands.QUESTION 720:An ISDN link can be encapsulated using either PPP or HDLC. What are theadvantages of using PPP? (Select two answer choices)A. PPP is easier to configure and maintain than HDLC.B. PPP is consistently implemented among different equipment vendors.C. PPP will run faster and more efficiently than HDLC on circuit-switched ISDN links.D. PPP authentication will prevent unauthorized callers from establishing an ISDNcircuit.E.
PPP can be routed across public facilities, while HDLC is not routable incircuit-switched networks.F. PPP supports asynchronous communication.Answer: B, DExplanation:PPP has numerous advantages over HDLC. Unlike HDLC which is Cisco proprietary,PPP was designed for multi-protocol interoperability. Secondly, PPP supportsauthentication, using either PAP or CHAP. Finally, PPP supports error correction and theuse of bonded multilink circuits.Incorrect Answers:A. The default encapsulation is HDLC. PPP must be explicitly configured and there aremany more options available with it, so it is more complicated than HDLC.C. HDLC is slightly more efficient than PPP.E. Neither PPP nor HDLC work in public circuit switched environments.F.
Although this is true, it would not be considered an advantage on an ISDN link, asISDN signaling is not asynchronous.Reference: CCNA Self-Study CCNA ICND exam certification Guide (Cisco Press,ISBN 1-58720-083-X) Page 308-310QUESTION 721:Which of the following correctly describe characteristics of PPP? (Select all validanswer choices)A. Encapsulates several different types of routing protocols.B.
Supports only IP.C. Can be used over analog circuits.Actualtests.com - The Power of Knowing640-802D. Is proprietary to CiscoE. Supports error correction.Answer: A, CExplanation:Characteristics of PPP:* PPP can be used on either type of line (dial or switched lines), because data-linkprotocols are designed for point-to-point environment.* PPP uses one LCP per link and one Control Protocol for each Layer 3 protocol definedon the link.
If a router is configured for IPX, Apple Talk, and IP on a PPP serial link, therouter configured for PPP encapsulation automatically tries to bring up the appropriatecontrol protocols for each layer 3 protocol.Incorrect Answers:B. PPP can be used to support any higher layer protocol, including IP, IPX, AppleTalk,etc.D. PPP is an industry standard used in point to point data networks. The Ciscoproprietary method that is similar to PPP is HDLC.Reference:CCNA Self-Study CCNA ICND exam certification Guide (Cisco Press, ISBN1-58720-083-X) Page 309QUESTION 722:You are preparing to create a point to point WAN by connecting a Cisco router witha Juniper router by way of their serial links.
Which one of the following commandswould you use?A. CK1 (config-if)# encapsulation hdlc ansiB. CK1 (config-if)# encapsulation pppC. CK1 (config-if)# encapsulation LAPDD. CK1 (config-if)# encapsulation frame-relay ietfE. CK1 (config)#encapsulation pppAnswer: BExplanation:PPP is the best encapsulation type to use, when connecting routers of differentmanufacturers, because PPP is non proprietary (unlike HDLC).
PPP is an industrystandard layer 2 encapsulation type that is supported by every router manufacturer.Incorrect Answers:A. HDLC is a cisco proprietary method of encapsulation for connecting a point to pointconnection. Although HDLC has become so popular that many other router vendors alsosupport it, HDLC ANSI is not an option that can be used.Actualtests.com - The Power of Knowing640-802C. LAPD is used as an out of band signaling protocol on connections such as ISDN. It isnot a choice that can be made in this case.D. This would be the correct choice if the connection was a frame relay connection,instead of a leased line connection. The ietf keyword is needed for connecting framelinks to routers that are non-cisco.E.
This command needs to be placed in interface configuration mode, not in globalconfiguration mode.QUESTION 723:Router Certkiller 1 exhibit:Router Certkiller 2 exhibit:Referring to the command outputs from the Certkiller routers shown above , whichof the following reasons would you attribute the connectivity problem between thetwo routers?A. The authentication needs to be changed to PAP for both routers.B.
The serial IP addresses of routers are not on the same subnet.C. The username/password combination is incorrectly configured.D. The router names are incorrectly configured.E. None of the aboveAnswer: CActualtests.com - The Power of Knowing640-802Explanation:When configuring for CHAP authentication, you must enters the other router's user nameand password.
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