From: Scott Morris (smorris@internetworkexpert.com)
Date: Sat Mar 14 2009 - 11:59:54 ARST
You're just looking at a quantity. If I have four apples, and you have six
oranges, how many more pieces of fruit do you have?
I'm pretty sure the answer wouldn't be 6. :) You have 6 more ORANGES than
I have, but you only have two more "pieces of fruit" as a generic term.
So 340 undecillion IPv6 addresses minus 4.2 billion IPv4 addresses is still
a lot. (grin)
2^128 - 2^32 != 2^96.
340,282,366,920,938,463,463,374,607,431,768,211,456 (2^128)
- 4,294,967,296 (2^32)
!= 79,228,162,514,264,337,593,543,950,336 (2^96)
So 79 octillion'ish is not your answer! :)
The actual differential between the two is
340,282,366,920,938,463,463,374,607,427,473,244,160 which while still in
the 340 undecillion'ish range is "a lot".
Thanks for playing!
Scott Morris, CCIE4 #4713, JNCIE-M #153, JNCIS-ER, CISSP, et al.
JNCI-M/JNCI-ER
Senior CCIE Instructor
smorris@internetworkexpert.com
Internetwork Expert, Inc.
http://www.InternetworkExpert.com
Toll Free: 877-224-8987
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Power corrupts.
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-----Original Message-----
From: nobody@groupstudy.com [mailto:nobody@groupstudy.com] On Behalf Of
Tharak Abraham
Sent: Friday, March 13, 2009 9:15 AM
To: slo
Cc: Cisco certification
Subject: OT:Re: IPV6 vs IPv4 addresses
Sorry for the minor err in option b.
Q.How many more IP addresses are available with IPv6 than IPv4 ?
a: 2^128
b: 2^96
c. 2^64
d. 2^32
@Slo : as long as IPv6 and IPv4 addresses doesn't overlap with each other,
then why not 2^128?
In this sense, even if i extinguish 100% of IPv4 why cant i have
2^128 more addresses in IPv6 !
On Fri, Mar 13, 2009 at 1:59 PM, slo <nebulite@gmail.com> wrote:
> IPv6 = 2^128
> IPv4 = 2^32
>
> IPv6/IPv4 = 2^(128-32) = 2^96
>
> If you want know How many more than IPv4 , I think is 2^(96-1) = 2^95
>
> So, a, b, c, d, all are wrong.
>
> I will choice C 2^96
>
> -------
> slo
>
> Best Regards!
> ------------------------------------------------------------
> Shen Lei CCIE#13947
> Software Business Department
> Jiangsu Fujitsu Telecommunications Technology Co.,Ltd. (JFTT) No.118,
> Dengwei Rd.,Suzhou, P.R. China
> Postcode: 215011
> Mail :shenlei@cn.fujitsu.com
> ------------------------------------------------------------
>
>
>
>
> -----Original Message-----
> From: nobody@groupstudy.com [mailto:nobody@groupstudy.com] On Behalf Of
> Tharak Abraham
> Sent: Friday, March 13, 2009 8:32 PM
> To: Cisco certification
> Subject: OT : IPV6 vs IPv4 addresses
>
> One of my friend got a question as follows in a tech exam.
>
> Looks easy but mind the word "more"
>
> Q.How many more IP addresses are available with IPv6 than IPv4 ?
>
> a: 2^128
> b: 2^92
> c. 2^64
> d. 2^32
>
>
> Best Regards,
> Tharak Abraham
>
>
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