CCNA Cisco Certified Network Associate Study Guide - FTP Server

486 Chapter 10 � Wide Area Networking Protocols
Router(config-if)#encapsulation ppp
Router(config-if)#^Z
Router#
Of course, PPP encapsulation must be enabled on both interfaces connected
to a serial line to work, and there are several additional configuration
options available by using the help command.
Configuring PPP Authentication
After you configure your serial interface to support PPP encapsulation, you
can then configure authentication using PPP between routers. First set the
hostname of the router if it is not already set. Then set the username and
password for the remote router connecting to your router.
Router#config t
Enter configuration commands, one per line. End with CNTL/Z.
Router(config)# hostname RouterA
RouterA(config)#username todd password cisco
When using the hostname command, remember that the username is the
hostname of the remote router connecting to your router. It is case-sensitive.
Also, the password on both routers must be the same. It is a plain-text password
and can be seen with a show run command. You can configure the
password to be encrypted by using the command service passwordconfig
before you set the username and password. You must have a username
and password configured for each remote system you are going to connect
to. The remote routers must also be configured with usernames and
passwords.
After you set the hostname, usernames, and passwords, choose the
authentication type, either CHAP or PAP.
RouterA#config t
Enter configuration commands, one per line. End with CNTL/Z.
RouterA(config)#int s0
RouterA(config-if)#ppp authentication chap
RouterA(config-if)#ppp autherntication pap
RouterA(config-if)#^Z
RouterA#