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Configure PPP (3.3) > Cisco Networking Academy Connecting Networks Companion Guide: Point-to-Point Connections | Cisco Press
Network and Security Einstein - Point-to-Point Protocol (PPP) authentication issues are one of the most common causes for dialup link failures. Handshake Authentication Protocol: router 1 configuration R1(config)#username R2 password cisco R1(config ...
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CCNA v3.0 200-125 GNS3 Labs: PPP troubleshooting (Part 1): PPP and PAP authentication (plus debugs) - YouTube
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Example of a Configuration Using CHAP Authentication (System Administration Guide: Network Services)
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