From: McLaughlin, Jeffery (JMcLaughlin@sfchronicle.com)
Date: Wed Dec 29 2004 - 17:13:22 GMT-3
I think answer A is more or less right. I'm not sure I would say it's a
"class A subnet" though. It's a Class A network, subnetted. When people say
that "10.1.1.1/24" is a "class C" network, they are wrong. It is class A.
Comer is the authority here: "In the classful addressing scheme, each address
is said to be self-identifying because the boundary between prefix and suffix
can be computed from the address alone." That is, the class of a network does
not depend on the mask; it only depends on the first octet (really, the first
three bits).
Jeff McLaughlin
CCIE #14023
-----Original Message-----
From: nobody@groupstudy.com [mailto:nobody@groupstudy.com] On Behalf Of John
Darpino
Sent: Wednesday, December 29, 2004 11:47 AM
To: gstudy
Subject: Classful Boundaries.
OK you big heads. Someone explain this to me.
Does the term "classful boundary" currently refer to:
A: The range into which a given addr falls that differentiates it from
one that falls into another, ie:
This network, 10.10.10.248/29 is a Class A subnet.
(since 10.x.y.z falls under the pre CIDR class A)
OR
B: The bit boundary closest to the bitmask in eight bit increments, ie:
This network, 10.10.10.248/29 is a Class C subnet.
(since the closest bit boundary is /24)
You will be settling a bet, so DON'T gimme that "both answers are
right" or "it depends on the context" or "just let the cat go unharmed
and we'll sort all this out without police involvement" stuff.
Which interpretation is more relevent?
-- Entropy - it's a tough job, but somebody's got to undo it.
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