NTP authentication

From: CCIEin2006 (ciscocciein2006@gmail.com)
Date: Sun Jan 29 2006 - 23:17:35 GMT-3

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I'm asking too many questions, aren't I?

I am trying to authenticate NTP to a router configured as NTP server. Could
someone please answer the following questions?

1. What does ntp authenticate do? I'm guessing it enables authentication.
2. What does ntp authentication-key do? I'm guessing it allows you to
specify a password.
3. What does ntp trusted key do? I have no clue what this does - isn't this
command redundant if you already have authentication-key?
4. When specifying an ntp server, what does specifying an ntp key do? If you
have the trusted key do you need to specify a key here?
For example:
ntp server 10.1.1.1 key 1 <--- Do you need to specify key here if you
already specified trusted key?
5. Are all of the above required for ntp authentication to work?
6. What is the difference between ntp server and ntp peer?

Thanks all.

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