Re: Brainstorming: Subneting and VLSM

The world of networking seems grander when stepping outside /8's, /16's,
and /24's. My best tip is knowing that a 240 is +- 4 (16 bit) from any
major Class. Than adding subtracting appropriately (ie if I need a 21 I
know 20 is the .240 and will add 8. If it is 19 I it is one less than 240
and subtract 32)

Anyone who got CCNA and works in a network role should know these numbers
like clock work...

255,254,252,248,240,224,192,128 and how they = CIDR addressing and vice
versa.

I agree completely, Joe. Practice makes perfect and I guess for us doing it
everyday we should consider ourselves lucky ;]

Marc

On Fri, Apr 13, 2012 at 12:08 PM, Joe Astorino <joeastorino1982_at_gmail.com>wrote:

> It's important to have a strong understanding of everything on the
> blueprint. In my opinion you should be fairly comfortable with the basics
> of regular expressions and know how to compose IPv6 ACLs. VLSM and
> subnetting on the other hand is just so fundamental to everything we do, in
> my opinion any great engineer or CCIE candidate needs to be able to do it
> on the fly, in your head thoroughly and accurately
>
> When I personally interview for technical positions, my first 2 or 3 are
> always subnetting related...and I expect the candidate at a minimum to be
> able to do it by hand with a pen and paper. Anything less is not what I
> consider to be up to par.
>
>
> On Fri, Apr 13, 2012 at 3:04 PM, marc edwards <renorider_at_gmail.com> wrote:
>
>> Joe:
>>
>> Would you say the same is true of REGEX? IPv6 ACLs? Thanks for input.
>>
>> Marc
>>
>>
>> On Fri, Apr 13, 2012 at 11:52 AM, Joe Astorino <joeastorino1982_at_gmail.com
>> > wrote:
>>
>>> My only message to guys studying out there would be if you can't do this
>>> problem in your head you are not ready to sit the lab exam. VLSM and
>>> subnetting should be and need to be second nature, like writing your name
>>> and address at this stage in the game.
>>>
>>> On Fri, Apr 13, 2012 at 1:44 PM, 6PE_2.0 <spycharlies_at_gmail.com> wrote:
>>>
>>> > Hello Guys,
>>> >
>>> >
>>> > As a skilled Network Engineer, if you sometimes find it difficult to do
>>> > subneting and VLSM without the help of a calculator, then this blog is
>>> for
>>> > you.
>>> >
>>> >
>>> > http://uyota.blogspot.ca/2012/04/subneting-and-vlsm.html
>>> >
>>> >
>>> > Without using a calculator, what is the maximum host for the network
>>> > 10.10.10.0/21?
>>> >
>>> > *
>>> > *
>>> >
>>> > *Design Requirement*
>>> >
>>> > *10.10.10.x/24 *
>>> >
>>> > What is the network address at each site?
>>> >
>>> > HQ = 100 host
>>> > Branch 1 = 20 host
>>> > Branch 2 = 30 host
>>> >
>>> > 2 WAN links
>>> >
>>> > Cheers :)
>>> >
>>> > 6pe_2.0
>>> >
>>> >
>>> > Blogs and organic groups at http://www.ccie.net
>>> >
>>> > _______________________________________________________________________
>>> > Subscription information may be found at:
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>>> >
>>> >
>>> >
>>> >
>>> >
>>> >
>>> >
>>> >
>>>
>>>
>>> --
>>> Regards,
>>>
>>> Joe Astorino
>>> CCIE #24347
>>> http://astorinonetworks.com
>>>
>>> "He not busy being born is busy dying" - Dylan
>>>
>>>
>>> Blogs and organic groups at http://www.ccie.net
>>>
>>> _______________________________________________________________________
>>> Subscription information may be found at:
>>> http://www.groupstudy.com/list/CCIELab.html
>>>
>>>
>>>
>>>
>>>
>>>
>>>
>>>
>>
>
>
> --
> Regards,
>
> Joe Astorino
> CCIE #24347
> http://astorinonetworks.com
>
> "He not busy being born is busy dying" - Dylan

Blogs and organic groups at http://www.ccie.net
Received on Fri Apr 13 2012 - 12:43:30 ART