From: Joseph Brunner (joe@affirmedsystems.com)
Date: Fri Aug 31 2007 - 13:46:20 ART
You're missing the fact that even though we see "one" and "two" in the ipv6
address you need to know those are indeed HEX numbers not decimal numbers...
so when you convert from hex to binary, remember each one is equal to four
bits in binary. So
1 in hex and 2 in hex is
0001 and 0010
Don't forget padding zeros... if a hex number doesn't use all its ones (and
wont until its "F" which is 1111,
It gets to "hold" the places with padding zeros...
So if you see an ipv6 address with some numbers 0-9 they indeed represent
4-bit hexadecimal values.
Joe
-----Original Message-----
From: nobody@groupstudy.com [mailto:nobody@groupstudy.com] On Behalf Of
Cecil Wilson
Sent: Friday, August 31, 2007 11:55 AM
To: Joseph Brunner; Usankin, Andrew; Cisco certification
Subject: RE: IPV6 Address Summarization - Windows calculator?
Can someone tell how we get
1 2
00000110
2 5
00010101
12 hex = c and 12 bin = 10010
25 hex = 19 and 25 bin = 100101
What am I missing
Thanks for help to shed some light on this
Cecil G. Wilson
IT Network Services
Office: (901) 215-2710
Cell: (901) 601-6201
-----Original Message-----
From: nobody@groupstudy.com [mailto:nobody@groupstudy.com] On Behalf Of
Joseph Brunner
Sent: Thursday, August 30, 2007 10:09 PM
To: 'Usankin, Andrew'; 'Cisco certification'
Subject: RE: IPV6 Address Summarization - Windows calculator?
That was me on the phone at the same time... when I hung up, I realized
my mistake (not padding the nibbles with zeros). EACH HEX number is 4
bits Even if in decimal its not. LOL
Yes you can use the windows calc in the lab. Its one of the few
resources available to you...
-J
-----Original Message-----
From: nobody@groupstudy.com [mailto:nobody@groupstudy.com] On Behalf Of
Usankin, Andrew
Sent: Thursday, August 30, 2007 4:40 PM
To: Cisco certification
Subject: IPV6 Address Summarization - Windows calculator?
:) In the light of Joseph's mistake I have a question. Can we use
windows calculator in the lab?
12(hex) = 00010010
25(hex) = 00110101
Andrew
-----Original Message-----
From: nobody@groupstudy.com [mailto:nobody@groupstudy.com] On Behalf Of
Joseph Brunner
Sent: Thursday, August 30, 2007 1:48 PM
To: 'Sadiq Yakasai'; 'Cisco certification'
Subject: RE: IPV6 Address Summarization
The first 48 bits wont change, agreed?
2001:141:1
2001:141:1
Lets look at the 16 bits of the 128 where have a different value...
12 in hex is shorted from 0012
25 in hex is shorted from 0025
Each XX equals 8 bits
So
00000000
00000000
That means we already have a /56 up to midway through the 4th 16 bit
block...
Now convert each nibble to binary and pad up to /64...
1 2
00000110
2 5
00010101
00000000000 (11 zero's of similarity in the 4th 16th bit block)
11 + 48 = 59
You are correct it's a /59
Who told you other wise?
-Joe
-----Original Message-----
From: nobody@groupstudy.com [mailto:nobody@groupstudy.com] On Behalf Of
Sadiq Yakasai
Sent: Thursday, August 30, 2007 2:56 PM
To: Cisco certification
Subject: IPV6 Address Summarization
Hi Guys,
Please could someone help out a guy here:
I need to summarize these two IPV6 addresses:
2001:141:1:12::/64
2001:141:1:25::/64
I have done it many times over, and what I find to be the summarized
address
is:
2001:141:1::/59
However, an excercise I am doing here says is
2001:141:1::/58
Please can someone confirm if I am right or wrong here?
Thanks!!
Sadiq
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