ccna 2 final exam

ccna 2 final exam.304 Chapter 14 Implementing Frame Relay One Subnets. If OSPF is used, all three routers should become OSPF neighbors. For OSPF to take effect on these routers, in addition to enabling OSPF in the OSPF configuration for the multipoint subinterfaces on each router, use ip ospf on the multipoint subinterfaces on all routersnetworkpoint-to-multipoint command on all routers. This command changes the OSPF network type to point-to-multipoint, telling each router to dynamically discover its neighbors (and not to use the specified router/backup the specified router [DR/BDR]). Tip: You might want to pause before you start reading the troubleshooting section of this chapter. Spend some time in the lab actually working on the Frame Relay configuration (realreal equipment, simulator, or whatever).14.2.2 Troubleshooting Frame RelayFrame Relay has many configurable features and options. Whether it is a real network or an exam, a Frame Relay troubleshooting problem usually means that the candidate must look at the configuration of all routers and make sure that the configuration meets the requirements. The LMI type must match or be auto-aware so that Layer 3 mapping information is known or statically mapped, so that each subinterface is associated with the correct DLCI value, and so on. Therefore, to adequately prepare for the CCNA exam, candidates should review and remember the many configuration options for Frame Relay and how each option is configured.However, there may be some Frame Relay questions on the exam that require the candidate to identify fault problems without looking at the configuration. The second part of this chapter focuses on troubleshooting Frame Relay, focusing on how to use the Show command to isolate the root cause of the problem in conjunction with the problem symptoms.1. Key Points for Troubleshooting Frame Relay ProblemsIsolating a Frame Relay problem should start with the ping command. Ideally, pinging another host on a remote LAN from an end-user's host on the LAN will quickly determine if the network is currently capable of achieving its ultimate goal, which is to transmit packets between different computers. If the ping fails, the next step is to ping the IP address of another Frame Relay router from one router. If that ping succeeds but the end-user ping fails, the problem is likely caused by a layer 3 problem (you can troubleshoot the problem using what is taught in Chapters 4 and 11). However, if pinging the IP address of another Frame Relay router from one router also fails, then the problem is likely to be related to the Frame Relay network.The focus of this troubleshooting section is to deal with a situation where one Frame Relay router cannot ping through to the Frame Relay IP address of another Frame Relay router. In this case, the administrator should ping the Frame Relay IP addresses of all other routers on the other end of each VC, thus determining the following.Did pinging all remote Frame Relay router IP addresses fail, or did some of them fail to ping while others succeeded? For example, Figure 14-7 shows a Frame Relay network, and the rest of the examples in this chapter will use that network example as well. If R1 fails in its attempt to ping R2's Frame Relay IP address (in this case, 102.2), the next question will be whether R1 can ping through R3 (10.1.34.3) and R4 (10.1.34.4).