cbt nuggets 200 301 download

cbt nuggets 200 301 download.Of the four rows of requirements listed in Table 11-3, the first two have been discussed and the last two have not.For EIGRP authentication, EIGRP supports routers trusting only routers that are EIGRP neighbors, provided that these routers share the same security secret key (passphrase); if this authentication fails, then the neighbor relationship does not exist. By default, routers do not attempt to obtain the EIGRP authentication that would allow them to establish a neighbor relationship. If one router uses authentication and the other does not, then they do not establish a neighbor relationship either. If both use authentication, they must use the same authentication key to establish a neighbor relationship.The last row in Table 11-3. The K value for EIGRP refers to the sum of the metric component and the metric value calculation. Cisco recommends keeping these values at their default settings and using only bandwidth and latency in the metric value calculations. These K-values are valid based on using different components disabled or enabled within the EIGRP composite metric. Because Cisco does not recommend that users change these values, special issues related to these values are not common. The K value settings must match before two routers become neighbors; users can check the K values on both routers using the showip protocols command.EIGRP Troubleshooting Examples Example H-8 shows three problems that can prevent two routers that should be EIGRP neighbors from establishing a neighbor relationship. The example uses the design commonly used in this chapter, as shown in Figure 11-5. The figure shows the same router and the same interface, but with the following problems: R2's IP address is configured as 10.1.2.2/24, and it is on a different subnet than Rl, R3, and R4.R3 is configured to use ASN 199 using the router eigrp 199 command, instead of ASN 99, which is used by the other 3 routers.Incorrect ASN(199) The R4 configuration uses MD5 authentication while the other three routers use no authentication.Figure 11-5 summarizes the problems with preconfiguring EIGRP neighbors on the central LANWrong subnet uses authentication (the others do not make236 Chapter 11 Troubleshooting IPv4 Routing ProtocolsR3# show ip protocols Routing Protocol is "eigrp 199" i