<ul><li>What function does the NAS perform after a user is sent a REJECT message by the

authentication server? What about the authentication server?</li> <li>Discuss the difference between the ERROR and  FAIL authentication processes for a network comprising three authentication  servers contained in the authentication list.</li><li>Describe what the network access server (NAS) would do when receiving an ACCEPT message when there are two authentication servers consisting of TACACS+ and RADIUS. Both servers are contained in the method authentication list.</li> <li>(b) Describe what the NAS would do when receiving a REJECT message when there are two authentication servers consisting of TACACS+ and RADIUS. Both servers are contained in the method authentication list.</li> <li>(c) Describe what the authentication server (security server) process would be when receiving an ERROR message when there are four authentication servers consisting of two TACACS+ servers and two RADIUS servers. The four security servers are contained in the method authentication list.</li> <li>What are the limitations of PPTP?</li></ul>

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