ccna 1 course pdf

ccna 1 course pdf.Use the username name password password global configuration command to configure the name and shared passphrase of the other router. Step 3 Use the PPPauthenticationchap interface subcommand to enable CHAPO on each interface of the routerExample 12-15 is a sample configuration using the same two routers as the previous example. The commands themselves are not complex, but it is easy to misconfigure the hostname and password. Note that each router is referencing the hostname of the other router in the username command, but both routers must be configured with the same password password. Not only is the password (in this case, mypass) case-sensitive, but the hostname referenced in the username command is case-sensitive as well.hostname R2 !username R1 password mypasshostname Rl username R2 password mypass router router R2Rl interface serial 0/0/0 ip address 192.168.2.1 255.255.255.0 encapsulation ppp ppp authentication chap interface serial 0/0/1 ip address 192.168. 2.2 255.255.255.0 encapsulation ppp ppp authentication chapFigure 12-15 CHAP ConfigurationSince CHAP is a feature of LCP, if the authentication process fails, then LCP will not complete and the interface will be in the "up" and "down" states.12.2.3 Serial Link TroubleshootingThis subsection discusses how to isolate and identify the root cause of faults related to the content covered earlier in this chapter. Again, this subsection does not repeat the IP troubleshooting already covered in Parts 2 and 3 of this book, but explicitly identifies some of the symptoms of failure that can occur on a serial link when a mismatch occurs between a Layer 3 subnet and an endpoint on the other end of the serial link, preventing the router from routing packets over the serial link.