From: Scott Morris (smorris@internetworkexpert.com)
Date: Mon Mar 16 2009 - 12:47:46 ART
I'm pretty sure I have posted this before, but in case I'm imagining
things....
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. (!= by the way means DOES NOT EQUAL)
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".
For what it's worth to anyone... If you DIVIDED 2^128 by 2^32, THEN you can
subtract the exponents and get 2^96. But subtraction alone doesn't give you
that luxury.
Cheers,
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
Outside US: 775-826-4344
Knowledge is power.
Power corrupts.
Study hard and be Eeeeviiiil......
-----Original Message-----
From: nobody@groupstudy.com [mailto:nobody@groupstudy.com] On Behalf Of
Radioactive Frog
Sent: Monday, March 16, 2009 10:50 AM
To: Edouard Zorrilla
Cc: Tharak Abraham; slo; Cisco certification
Subject: Re: OT:Re: IPV6 vs IPv4 addresses
Close but not enuf to get marks :)
~2^128 is not an answer. actual hosts are less than that :(
frog
On Mon, Mar 16, 2009 at 11:30 PM, Edouard Zorrilla
<ezorrilla@tsf.com.pe>wrote:
> 2^128 - 2^32 = 2^32(2^96-1) so in the limit 2^96-1 ~ 2^96
>
> So the answer should be 2^32(2^96-1) ~ 2^32(2^96) ~ 2^128 so the answer
> should be A.
>
> Jut math I guess,
>
> Regards
>
> ----- Original Message ----- From: "Tharak Abraham" <
> tharakabraham@gmail.com>
> To: "slo" <nebulite@gmail.com>
> Cc: "Cisco certification" <ccielab@groupstudy.com>
> Sent: Friday, March 13, 2009 8:15 AM
> 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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>>
>>
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>
>
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