(The following content is part of the configuration content: R1(config)#usernameR2passwordCCIER1(config)#interfaces1/0R1(config-if)#encapsulationpppR1(config-if)#pppauthenticationchapR1(config-if)#noshutdownR2(config)#usernameR1PASswordCCIER2(config)# interfaces1/1R2(config-if)#encapsulationpppR2(config-if)#pppauthenticationchapR2(config-if)#noshutdown)