From: ying chang (ying_c@xxxxxxxxxxx)
Date: Tue Apr 09 2002 - 09:04:25 GMT-3
Thanks guys.
I guess I'll take Mas Kato's approach if the good procotor has troubles to
understand my broken English. Should spent more time in English instead of
chasing girls all over the town when I was young.
Time to back to my dungeon.
I'm learning...
Thanks,
Chang
>From: "Lupi, Guy" <Guy.Lupi@eurekaggn.com>
>To: 'ying chang ' <ying_c@hotmail.com>, "'ccielab@groupstudy.com '"
><ccielab@groupstudy.com>
>Subject: RE: multiple-choice: one way ppp auth chap
>Date: Mon, 8 Apr 2002 23:27:33 -0400
>
>I think the proper way to approach this scenario is by the way the question
>is asked. If the requirement is that both routers be able to authenticate,
>but in any transaction only one should authenticate, then "ppp
>authentication chap callin" on both sides. If the requirement is that a
>particular router in the pair only authenticate inbound calls, the "ppp
>authentication chap callin" on one side, "ppp authentication chap" on the
>other. If only one router should ever authenticate, then "ppp
>authentication chap" on that router, and no "ppp authentication chap" on
>the
>other. At least that is the way I would approach it, of course the proctor
>is always there, and I have heard they are helpful as long as you don't ask
>them how to do something. Maybe you could just ask what exactly they mean.
>
>-----Original Message-----
>From: ying chang
>To: ccielab@groupstudy.com
>Sent: 4/8/2002 10:14 PM
>Subject: multiple-choice: one way ppp auth chap
>
>Sorry about beating the dead horse. I need help to get this one down.
>What
>is your choice in case you are asked to do "one way ppp authentication"?
>The
>"debug ppp auth" result is at the bottom of each case, I know most
>people
>would choose B, but I feel a little bit uneasy on mutual authentication
>taking place when r2 calls r1:
>
>A. r1 - ppp auth chap callback
> r2 - ppp auth chap
>
> result: r1 call r2 => r2 challenge r1
> r2 call r1 => r2 challenge r1
>----------------------------------------------
>B. r1 - ppp auth chap callin
> r2 - ppp auth chap
>
> result: r1 call r2 => r2 challenge r1
> r2 call r1 => mutual authentication
>----------------------------------------------
>C. r1 - ppp auth chap callin
> r2 - ppp auth chap but r2 is not allowed to call r1
>
> result: r1 call r2 => r2 challenge r1
>----------------------------------------------
>D. r1 - ppp auth chap callin
> r2 - no ppp auth chap statement
>
> result: r1 call r2 => no authentication
> r2 call r1 => r1 challenge r2
>-----------------------------------------------
>
>Thanks,
>Chang
>
>
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