CCNA 4 Pretest Part 2

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21. Which criterion is preferred by the router to choose arouter ID?□the router-id rid commandthe IP address of the highest configured loopback interface on therouterrthe IP address of the highest active interface on the router□i the IP address of the highest active OSPF-enabled interfaceThe preferred order of criteria for Cisco routers to identify the router ID is: anexplicitly configured router using the router-id rid command; the IP address ofany configured loopback interface; and the IP address of any active interface onthe router (it does not have to be an OSPF-enabled interface).22. A network administrator is entering the command ipv6unicast-routing to start configuring DHCPv6 operation on arouter. Which statement describes the function of thiscommand?□It is required to configure stateless DHCPv6 server on the router.LIt is required to configure stateful DHCPv6 server on the router.rIt is required for sending ICMPv6 RA messages._□It is required for enabling DNS service in DHCPv6 configurations.The ipv6 unicast-routing command is required to enable IPv6 routing on a router.This command is not necessary for the router to be a stateless or statefulDHCPv6 server, but is required for sending ICMPv6 RA messages.23. What three services are provided by the transport layer?(Choose three.)□encryption of data□path determinationrbit transmissionrflow control□error recoveryrconnection establishment□data representationThe transport layer is responsible for tracking digital conversations between asource application and a destination application through the use of port numbers.Two protocols that operate at the transport layer are TCP and UDP. TCP canprovide reliability by establishing a connection, maintaining flow control, and errorrecovery.24. Which TCP/IP model layer is closest to the end user?□internetLtransport□application

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□network accessEnd users use applications to interact with and use the network. The applicationlayer of the TCP/IP model is closest to the end user. Application layer protocolsare used to communicate and exchange messages with other network devicesand applications. The layers of the TCP/IP model are from top to bottom(memory aid - ATIN): application, transport, internet, network access25. When applied to a router, which command would helpmitigate brute-force password attacks against the router?□service password-encryption□login block-for 60 attempts 5 within 60Lexec-timeout 30□banner motd $Max failed logins = 5$The login block-for command sets a limit on the maximum number of failed loginattempts allowed within a defined period of time. If this limit is exceeded, nofurther logins are allowed for the specified period of time. This helps to mitigatebrute-force password cracking since it will significantly increase the amount oftime required to crack a password. The exec-timeout command specifies howlong the session can be idle before the user is disconnected. The servicepassword-encryption command encrypts the passwords in the runningconfiguration. The banner motd command displays a message to users who arelogging in to the device.26. Which circumstance would result in an enterprise decidingto implement a corporate WAN?□when its employees become distributed across manybranch locationsLwhen the enterprise decides to secure its corporate LAN□when the network will span multiple buildingsLwhen the number of employees exceeds the capacity of the LANWANs cover a greater geographic area than LANs do, so having employeesdistributed across many locations would require the implementation of WANtechnologies to connect those locations. Customers will access corporate webservices via a public WAN that is implemented by a service provider, not by theenterprise itself. When employee numbers grow, the LAN has to expand as well.A WAN is not required unless the employees are in remote locations. LANsecurity is not related to the decision to implement a WAN.27. A corporation is searching for an easy and low cost solutionto provide teleworkers with a secure connection toheadquarters. Which solution should be selected?rleased line connection□site-to-site VPN over the Internet

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□dial-up connectioniremote access VPN over the InternetA remote access VPN over the Internet is an appropriate solution to meet therequirement for secure connections to individual teleworkers. Site-to-site VPNsare used to connect between offices. Leased lines are very expensive formultiple teleworkers. A dial-up connection is very slow and the corporation needsto maintain a facility (a bank of access servers) to handle multiple simultaneousdial-up connections.28. Which three statements are true about PPP? (Choosethree.)□PPP can only be used between two Cisco devices.rPPP uses LCPs to agree on format options such asauthentication, compression, and error detection.rPPP carries packets from several network layer protocols in LCPs.□PPP uses LCPs to establish, configure, and test thedata-link connection.PPP can use synchronous and asynchronous circuits.PP is an encapsulation standard for transporting IP traffic over point-to-pointsynchronous and asynchronous links. PPP uses LCP to establish, configure, andtest Layer 2 connections and also to negotiate authentication, compression, anderror detection.29. A network administrator is configuring a PPP link with thecommands:Rl(config-if)# encapsulation pppRl(config-if)# ppp quality 70What is the effect of these commands?□The NCP will send a message to the sending device if the link usagereaches 70 percent.LThe PPP link will not be established if more than 30 percent of optionscannot be accepted.rThe LCP establishment phase will not start until the bandwidthreaches 70 percent or more.rThe PPP link will be closed down if the link qualitydrops below 70 percent.LCP provides an option to monitor the link quality. The command ppp qualitypercentage ensures that the link meets the quality requirement set; otherwise thelink closes down.30. What is the protocol that provides ISPs the ability to sendPPP frames over DSL networks?□CHAP

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