Time
30 hours 46 minutes
Difficulty
Intermediate
CEU/CPE
20

Video Description

CHAP Lab Now we move on to is Challenge Authentication Protocol (CHAP). In this lesson we examine what the CHAP function is, how it uses MD5, what happens to impacts how the state changes from UP to down, and how to completely configure it on both ends of the transaction.

Video Transcription

00:04
the next authentication protocol we're gonna cover
00:07
is challenge Handshake with Indication particle or chap.
00:11
Now chap
00:14
sends a message Digest five or MD five. Digest off the original password or the link.
00:22
The original password. Cisco, we're gonna peck.
00:26
We'll never be exchanged over that link.
00:29
For that reason, both sides must know the password and have a database
00:35
have a user name and password in their database to begin with.
00:41
So we must create
00:44
the user name and password for each side authenticating the other side on both sides.
00:51
No, that was wrong.
00:55
Will challenge handshake authentication protocol.
00:58
The original password or the actual clear text password is never sent across the link.
01:03
However, a message digest five
01:07
or an nd five hash of the password is exchanged over the length
01:12
To configure
01:15
chap, you must create a user name password database on both sides of the length.
01:22
So I'm going to go to outer one, which I'm here.
01:25
It's a user user name, aren't you? Password
01:30
Cisco
01:33
and I'm going to go to our two
01:37
and say
01:38
user name are one password.
01:44
Cisco.
01:48
Now I'm going to make a router one, though 10 Decatur again.
01:52
So in rather one I'm going to say
01:55
interface
01:57
000 encapsulation P p p
02:04
p p. P.
02:05
I have taken it with encapsulation ppp from both ends before I started this part of the lecture. So router to is still HDL. See, at this point, which is why
02:15
the interface state has been changed to down.
02:22
Then I'm going to say PPP authentication chap.
02:30
And then I'm going to go to Router One and changed encapsulation two ppp.
02:36
And at that point, the link should come up.
02:40
Caps, elation, PPP,
02:44
give it a minute and the link came up paying the other side 201 11 which is rather one I'm sitting on route to
02:53
and my link is up. So, as you see, chap is a little bit easier to configure
03:00
then perhaps because you only need to assign the user name and password on both ends.
03:07
And then it changed encapsulation to P p pee on both ends and then make one side. The authenticator on the other side is going to be the authenticated. This point if we check our interface, breathe,
03:22
I keep forgetting the word I p
03:24
mind to face a cz up, up. This concludes the PPP lecture

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