cisco ccna exam schedule

cisco ccna exam schedule.In this example, note that the lep state is not OPEN; also, note that the IP and CDP states are CLOSED. these states indicate that the LCP encountered a problem establishing the connection, resulting in the data link layer not being active (the interface state is "up,lineprotocol isdown ") o In this example, this is because the CHAP passwords for the two routers do not match.Video 24.06 A multimedia demonstration of troubleshooting PPP authentication on a router is included in the companion digital resource to this book. Of course, you cannot determine that the problem is with authentication based on the preceding output alone. To determine this, use the command debug ppp authenticationo The following is sample output from this command when using two-way CHAP authentication.RouterA# debug ppp authentication%LINK-3-UPDOWN: Interface SerialO, changed state to up SeO PPP: Treating connection as a dedicated line SeOPPP. Phase is AUTHENTICATING, by both SeOCHAP: 0 CHALLENGE id 2 len 28 from "RouterA" SeOCHAP: I CHALLENGE id 3 len 28 from "RouterB" SeOCHAP: 0 RESPONSE id 3 len 28 from "RouterA"SeO CHAP: I RESPONSE id 2 len 28 from "RouterB"SeO CHAP: O SUCCESS id 2 len 4SeO CHAP:%LINEPROTO-5-UPDOWN: Line protocol on Interface SerialO, changed state to upI SUCCESS id 3 len 4In this example, note that the two routers (RouterA and RouterB) use CHAP for authentication. they both send CHALLENGE, and both receive the corresponding RESPONSE. note the I and O after SeOCHAP, which indicate the direction of transmission of the CHAP message: the I indicates inbound, and the O indicates outbound. Next is the status of the hash code: SUCCESSo finally, the data link layer of the serial interface is activated.The following is an example of using bidirectional PAP authentication. RouterA# debug ppp authentication%LINK-3-UPDOWN: Interface SerialO, changed state to up PPP: Treating connection as a dedicated line PPP: Phase is SeO AUTHENTICATING, by SeO PAP: O AUTH-REQ id 2 len 18 from both