Re: 2 days to go....

Hi David,

TCP window scaling is a mechanism to adopt more window size, which is
greater than the default 2^16 which equals to 65,535 (16 bit window field
size)

For high performance/ high bandwidth segment this value has to be increased,
i.e when the bandwidth*delay product has to be greater than 65,535.

Cisco by default gives the value of 65,535 for the window scaling and since
your question tells double the maximum default size its 65,535 * 2 = 131,070

If Window scaling is not configured the default is 4128.

Best Regards,
Tharak Abraham Luke

On Sun, Jul 11, 2010 at 3:20 AM, MURRAY, David <David.MURRAY_at_deta.qld.gov.au
> wrote:

> In to the final stretch now of my preparation for the R&S lab.
>
> There are a few niggling questions I have my head, and I would appreciate
> it if anyone could help. They may be answered somewhere so I apologize for
> doubling up, but I have only had time for a really brief look as I need to
> get back to the labs!!
>
> I will break them up.
>
> Technical
> - What is the default window scaling size? I know the tcp window size is
> 4128, but I was asked a question about enabling the window scaling size up
> to twice the maximum of the default. The answer was 131072, but I was never
> able to find anything on the default size to see how the answer was derived.
>
> - If a subnet is not part of an IGB, but the start of the lab always asks
> for full reachability at the end, should I redistribute is as connected? I
> do as a rule, but I would like to be 100% sure so I dont lose points.
>
> - If I put non intrusive acls/no ip route-cache on for testing, do I lose
> points if I dont remove them?
>
> Not Technical
> - Do they provide an adequate amount of colored pens/pencils and paper? I
> seem to go through about a tree for every mock lab so I want to make sure
> they will give me enough.
>
> Not so Technical (I think I have OSPF on the brain!!)
> - Does anyone have any tips to help me in the lab? I have used everything
> INE have thought me so far, but was just wondering if anyone done(does)
> anything that helped them, especially around note taking. I seem to have
> trouble with reading through the full paper and documenting how one question
> affects another, by the time I get to about section 6 and above I always
> forget what the lab asked for in the opening parts!!
>
> Thanks very much, any help is much appreciated. I have been greatful for
> all the assistance so far, special thanks to Anthony Sequeira(Your mock lab
> thought me so much), and Narbik. I just hope I pass now, I am heading home
> to Ireland for a much needed holiday and I dont want to have to bring the
> books.
>
> Please unicast replies as I am out of the office and I can access the
> folder my groupstudy mails go directly into.
>
>
> Blogs and organic groups at http://www.ccie.net
>
> _______________________________________________________________________
> Subscription information may be found at:
> http://www.groupstudy.com/list/CCIELab.html

Blogs and organic groups at http://www.ccie.net
Received on Sun Jul 11 2010 - 09:00:00 ART