31 Days Before Your CCNA Exam

250 31 Days Before Your CCNA ExamIf one or more expected neighbors exist, before moving on to look at OSPF neighbor requirements,you should confirm that the two routers can ping each other on the local subnet. As soon asthe two neighboring routers can ping each other, if the two routers still do not become OSPFneighbors, the next step is to examine each of the OSPF neighbor requirements. Table 11-4 summarizesthe requirements, listing the most useful commands with which to find the answers.Table 11-4RequirementOSPF Neighbor Requirements and the Best show/debug CommandsBest Command(s) to Isolate the ProblemMust be in the same subnetMust pass any neighbor authenticationHello and hold/dead timers must matchMust be in the same areaRouter IDs must be uniqueshow interfaces, debug ip ospf hellodebug ip ospf adjshow ip ospf interface, debug ip ospf hellodebug ip ospf adj, show ip ospf interface briefShow ip ospfStudy ResourcesFor today’s exam topics, refer to the following resources for more study.Resource Chapter Topic Where to Find ItFoundational ResourcesCCNA Exploration Chapter 2, Managing and Troubleshooting Section 2.7Online Curriculum: “Static Routing” Static RoutesRouting Protocols Chapter 5, “RIP Verification and Troubleshooting Section 5.3and Concepts version 1”Chapter 7, “RIPv2” Verifying and Troubleshooting RIPv2 Section 7.4CCNA Exploration Chapter 2, Managing and Troubleshooting pp. 130–134Routing Protocols and “Static Routing” Static RoutesConcepts Companion Chapter 5, “RIP Verification and Troubleshooting pp. 231–238Guide version 1”Chapter 7, “RIPv2” Verifying and Troubleshooting RIPv2 pp. 323–329ICND1 Official Exam Chapter 15, All topics within the chapter pp. 475–504Certification Guide “TroubleshootingIP Routing”ICND2 Official Exam Chapter 7, All topics within the chapter pp. 270–300Certification Guide “TroubleshootingIP Routing”Chapter 11, All topics within the chapter pp. 408–427“TroubleshootingRouting Protocols”ICND2 Authorized Chapter 4, “Single- Troubleshooting OSPF pp. 160–167Self-Study Guide Area OSPFImplementation”Chapter 5, Troubleshooting EIGRP pp. 192–200“Implementing EIGRP”