Which protocol is an open standard protocol framework that is commonly used in VPNs, to provide secure end-to-end communications?
What are three reasons that an organization with multiple branch offices and roaming users might implement a Cisco VPN solution instead of point-to-point WAN links?
Which command is used to enable CHAP authentication, with PAP as the fallback method, on a serial interface?
Which Layer 2 protocol encapsulation type supports synchronous and asynchronous circuits and has built-in security mechanisms?