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Eric Underwood
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1 Review Questions The following questions are designed to test your understanding of this chapter s material. For more information on how to get additional questions, please see a. You can find the answers to these questions in Appendix B, Answers to Review Questions. 1. Which command will display the CHAP authentication process as it occurs between two routers in the network? A. show chap authentication B. show interface serial 0 C. debug ppp authentication D. debug chap authentication 2. Which of the following are true regarding the following command? (Choose two.) R1(config-router)#neighbor remote-as 6200 A. The local router R1 uses AS B. The remote router uses AS C. The local interface of R1 is D. The neighbor IP address is E. The neighbor s loopback interface is BGP uses which Transport layer protocol and port number? A. UDP/123 B. TCP/123 C. UDP/179 D. TCP/179 E. UDP/169 F. TCP/ Which command can you use to know the hold time on the two BGP peers? A. show ip bgp B. show ip bgp summary C. show ip bgp all D. show ip bgp neighbor 5. What does a next hop of mean in the show ip bgp command output?

2 Network Next Hop Metric LocPrf Weight Path *> / ? *> / ? A. The router does not know the next hop. B. The network is locally originated via the network command in BGP. C. It is not a valid network. D. The next hop is not reachable. 6. Which two of the following are GRE characteristics? (Choose two.) A. GRE encapsulation uses a protocol-type field in the GRE header to support the encapsulation of any OSI layer 3 protocol. B. GRE itself is stateful. It includes flow-control mechanisms, by default. C. GRE includes strong security mechanisms to protect its payload. D. The GRE header, together with the tunneling IP header, creates at least 24 bytes of additional overhead for tunneled packets. 7. A GRE tunnel is flapping with the following error message: 07:11:49: %LINEPROTO-5-UPDOWN: Line protocol on Interface Tunnel0, changed state to up 07:11:55: %TUN-5-RECURDOWN: Tunnel0 temporarily disabled due to recursive routing 07:11:59: %LINEPROTO-5-UPDOWN: Line protocol on Interface Tunnel0, changed state to down 07:12:59: %LINEPROTO-5-UPDOWN: What could be the reason for the tunnel flapping? A. IP routing has not been enabled on tunnel interface. B. There s an MTU issue on the tunnel interface. C. The router is trying to route to the tunnel destination address using the tunnel interface itself. D. An access list is blocking traffic on the tunnel interface. 8. Which of the following commands will not tell you if the GRE tunnel 0 is in up/up state? A. show ip interface brief B. show interface tunnel 0 C. show ip interface tunnel 0 D. show run interface tunnel 0 9. Which of the following PPP authentication protocols authenticates a device on the other end of a link with an encrypted password? A. MD5 B. PAP C. CHAP D. DES 10. Which of the following encapsulates PPP frames in Ethernet frames and uses common PPP features like authentication, encryption, and compression?

3 A. PPP B. PPPoA C. PPPoE D. Token Ring 11. Shown is the output of a show interfaces command on an interface that is configured to use PPP. A ping of the IP address on the other end of the link fails. Which two of the following could be the reason for the problem? (Choose two.) R1#show interfaces serial 0/0/1 Serial0/0/0 is up, line protocol is down Hardware is GT96K Serial Internet address is /30 A. The CSU/DSU connected to the other router is not powered on. B. The IP address on the router at the other end of the link is not in subnet /24. C. CHAP authentication failed. D. The router on the other end of the link has been configured to use HDLC. 12. You have configured a serial interface with GRE IP commands on a corporate router with a point-to-point link to a remote office. What command will show you the IP addresses and tunnel source and destination addresses of the interfaces? A. show int serial 0/0 B. show ip int brief C. show interface tunnel 0 D. show tunnel ip status E. debug ip interface tunnel 13. Which of the following is true regarding WAN technologies? (Choose three.) A. You must use PPP on a link connecting two routers using a point-to-point lease line. B. You can use a T1 to connect a customer site to the ISP. C. You can use a T1 to connect a Frame Relay connection to the ISP. D. You can use Ethernet as a WAN service by using EoMPLS. E. When using an Ethernet WAN, you must configure the DLCI. 14. You want to allow remote users to send protected packets to the corporate site, but you don t want to install software on the remote client machines. What is the best solution that you could implement? A. GRE tunnel B. Web VPN C. VPN Anywhere 15. Why won t the serial link between the Corp router and the Remote router come up? Corp#sh int s0/0

4 Serial0/0 is up, line protocol is down Hardware is PowerQUICC Serial Internet address is /24 MTU 1500 bytes, BW 1544 Kbit, DLY usec, reliability 254/255, txload 1/255, rxload 1/255 Encapsulation PPP, loopback not set Remote#sh int s0/0 Serial0/0 is up, line protocol is down Hardware is PowerQUICC Serial Internet address is /24 MTU 1500 bytes, BW 1544 Kbit, DLY usec, reliability 254/255, txload 1/255, rxload 1/255 Encapsulation HDLC, loopback not set A. The serial cable is faulty. B. The IP addresses are not in the same subnet. C. The subnet masks are not correct. D. The keepalive settings are not correct. E. The layer 2 frame types are not compatible. 16. Which of the following are benefits of using a VPN in your internetwork? (Choose three.) A. Security B. Private high-bandwidth links C. Cost savings D. Incompatibility with broadband technologies E. Scalability 17. Which two technologies are examples of layer 2 MPLS VPN technologies? (Choose two.) A. VPLS B. DMVPM C. GETVPN D. VPWS 18. Which of the following is an industry-wide standard suite of protocols and algorithms that allows for secure data transmission over an IP-based network that functions at the layer 3 (Network layer) of the OSI model? A. HDLC B. Cable C. VPN E. xdsl 19. Which of the following describes the creation of private networks across the Internet, enabling privacy and tunneling of non-tcp/ip protocols?

5 A. HDLC B. Cable C. VPN E. xdsl 20. Which two VPNs are examples of service provider managed VPNs? (Choose two.) A. Remote-access VPN B. Layer 2 MPLS VPN C. Layer 3 MPLS VPN D. DMVPN

CCNA Routing and Switching Study Guide Chapters 7 & 21: Wide Area Networks

CCNA Routing and Switching Study Guide Chapters 7 & 21: Wide Area Networks Instructor & Todd Lammle Chapter 21 objectives The ICND2 topics covered in this chapter include: 2 Chapter 21 objectives (con