From: Ben Rife (brife@xxxxxxxxxx)
Date: Mon Jan 31 2000 - 12:14:19 GMT-3
Thanks for calming my fears guys !!!
You are the best,
Ben
----- Original Message -----
From: <simon.baxter@citicorp.com>
To: <brife@bignet.net>; <ccielab@groupstudy.com>; <gahm@gci.net>
Sent: Monday, January 31, 2000 6:17 AM
Subject: RE: VLSM and IP Addressing
This is a horrible Cisco gotcha. There's a few guys in my office which
are studying for their CCNAs etc and came to me with this question.
Their training books, based on the Cisco exams etc, imply that unless a
specific class is stated - assume an 8 bit (class A) base on any bit
mask given.
ie there was a question of "how many nets/hosts on a 22 bit subnet
mask". What this translated to was actually how many nets/hosts on a 30
bit mask (22+8).
But since your question included a class indication, you use that as
your base.
ugly huh! ugly but true.
-----Original Message-----
From: gahm [mailto:gahm@gci.net]
Sent: Monday, January 31, 2000 6:17 AM
To: brife; ccielab
Cc: gahm
Subject: Re: VLSM and IP Addressing
Ben,
What they mean is to add 8 subnet bits to the natural mask. In other
words, since 130.10.X.X is a class B address, which has a natural
mask of 255.255.0.0, they are indeed asking you to
use a 24 bit mask.
Dave
-----Original Message-----
From: Ben Rife <brife@bignet.net>
To: ccielab@groupstudy.com <ccielab@groupstudy.com>
Date: Sunday, January 30, 2000 9:08 PM
Subject: VLSM and IP Addressing
I have a practice lab here that has the following addressing
requirement.
Configure all of the networks using network 130.10.X.X.
Use an 8-bit subnet mask unless otherwise specified.
This troubles me. Correct me if I'm wrong, but wouldn't this
be a problem for routing? I mean if you have the following senario:
|--R1------R2--|
R1's E0 is 130.1.1.1 255.0.0.0
R2's E0 is 130.2.2.2 255.0.0.0
Try getting any protocol to run on this network...it won't
work will it?
Essentially these two addresses are on the same network. Do
you agree? This
has me puzzled. This is the 2nd time I've seen this IP
addressing senario in
a practice lab today. I wouldn't know what to do if I was
asked that on the
lab.
OR...OR....does it mean to use a /24 mask eventhough it calls
for an 8-bit subnet mask?
Thanks for the help,
Ben
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