Actually, I found this little tidbit on Fatkid.com. I have never tried it
but it appears from their response that you can use them as subnet masks as
well as in access lists...
Not many people are aware that TCP/IP address masks neither need to be
contiguous or have ones starting from the left. The following are examples
of typical TCP/IP masks that you might see everyday:
11111111.11111111.11111111.00000000 - 255.255.255.0
11111111.11111111.00000000.00000000 - 255.255.0.0
11111111.11110000.00000000.00000000 - 255.240.0.0
Here are a few valid masks that you probably have not seen before:
10101010.10101010.10101010.10101010 - 170.170.170.170
00000000.11111111.00000000.11111111 - 0.255.0.255
If you get a chance set "ip classless" on a Cisco router and try some of
these goofy masks.
Tim
----- Original Message -----
From: "Bradley J. Wilson" <[EMAIL PROTECTED]>
To: <[EMAIL PROTECTED]>
Sent: Sunday, September 03, 2000 7:36 AM
Subject: Re: Subnet Question
The answer to the question as stated would be false, but - you *can* use
discontiguous masks in access lists, which can be a pretty handy feature
sometimes.
Sincerely,
Bradley J. Wilson
CCNA, CCDA, MCSE, CCSE, CNX-A, MCT, CTT
----- Original Message -----
From: Aaron Moreau-Cook
To: [EMAIL PROTECTED]
Sent: Saturday, September 02, 2000 8:47 PM
Subject: Subnet Question
Question taken from the CCNA Exam Cram book by Walters, Rees, and Coe.
A subnet mask can have a value of 0.255.255.0
A) True
B) False
The Cisco answer would dictate that it is false, and in all functionality it
is true. Hypothetically though it could be true, I rememeber this discusion
a while ago, but I'm looking to see if I am smoking the proverbial crack.
Thanks all!
Aaron Moreau-Cook
Finally taking his CCNA test this coming Friday....
___________________________________
UPDATED Posting Guidelines: http://www.groupstudy.com/list/guide.html
FAQ, list archives, and subscription info: http://www.groupstudy.com
Report misconduct and Nondisclosure violations to [EMAIL PROTECTED]
___________________________________
UPDATED Posting Guidelines: http://www.groupstudy.com/list/guide.html
FAQ, list archives, and subscription info: http://www.groupstudy.com
Report misconduct and Nondisclosure violations to [EMAIL PROTECTED]
