private addresses exam question

Unanswered Question
May 1st, 2008
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Hi all

on the ccent exam, if I was asked what were 2 private ips out of

10.217.1.1

172.16.1.1

127.2.2.2

225.4.4.4


which ones would be private, i would say a and b, but on one of the practice tests, it says the 127.x.x.x is private, surely this is incorrect ?

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Jon Marshall Thu, 05/01/2008 - 12:57
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Carl


RFC1918 states that the private addressing ranges are


10.0.0.0 - 10.255.255.255 (10/8 prefix)

172.16.0.0 - 172.31.255.255 (172.16/12 prefix)

192.168.0.0 - 192.168.255.255 (192.168/16 prefix)


see RFC for full details


http://www.ietf.org/rfc/rfc1918.txt?number=1918


127.x.x.x is a special range of addressing designed for loopback addressing. It's not routable so in a way it could be described as a private address but if you had to choose 2 from the above it would be a & b as you say. See link for more details


http://tools.ietf.org/html/rfc3330


Good luck with your exam tomorrow.


Jon






bs6825 Thu, 05/01/2008 - 16:28
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If you were asked a question on any Cisco exam, it is a violation of the NDA to repeat that question to anyone, including this forum.

DulleMacBath Fri, 05/02/2008 - 03:09
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Well, he said:

"Hi all on the ccent exam, if I was asked..."

Please notice the if word


"but on one of the practice tests, it says.."

Please notice the practice test words

Rick Morris Fri, 05/02/2008 - 08:02
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good catch on the "IF"


-Rick

bs6825 Sat, 05/03/2008 - 23:17
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Well said by all who saw the if and other details, original point still stands, adding an "if" may not change the facts IF the original poster added the if not to look guilty. If the person is not guilty, let my point stand as a warning to others.

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