cisco ccna gold bootcamp

cisco ccna gold bootcamp.. PAP uses a two handshake process to send the password in clear text. CHAP uses a three-handshake process, which sends an MD5 hash generated from the query, host name, and password.. To configure authentication, use the command ppp authentication chap|papo To troubleshoot authentication, use the command debug ppp authentication; in the output of this command, the CHALLENGE, RESPONSE, and SUCCESS messages are generated by CHAP, while the AUTH -REQ and AUTH-ACK are generated by PAP.. VPNs provide secure connections between different networks (L2L VPNs) or between networks and users (remote access VPNs).. Cisco's two main remote access technologies are EasyVPN using IPsec and WebVPN using SSLo. IPSec uses pre-shared keys or certificates (RSA signatures) to provide peer authentication, encryption to provide confidentiality, HMAC functions to provide packet integrity, and unique sequence numbers in packets to provide anti-playback protection.Generic Routing Encapsulation Tunnel. GRE provides a logical connection between two routers. . GRE can carry any Layer 3 protocol and can also carry bridging traffic.. GRE does not provide any security mechanisms.. When configuring a tunnel interface, the addresses at both ends must be reachable. When establishing a tunnel over the public network (Internet). the addresses of the interfaces connected to the Internet at each end of the tunnel must be public.. To create a GRE tunnel interface, use the following command: interface tunnek tunnel source and tunnel destination o