At 11:16 PM 3/13/02, Chuck wrote: >interesting way to put the question. but...... > >172.16.0.0/12 and 192.168.0.0/16 are CIDR notation.
It's also simply a notation used by humans to save on the typing required. You will often see the private class B addresses listed as 172.16.0.0 - 172.31.255.255. That's the same thing as 172.16.0.0/12. Notice that the first 12 bits are the same in all the network addresses in the 172.16.0.0 - 172.31.255.255 range, so why not save on some typing? Priscilla >any subnets within those >ranges would default to the classfull values based upon the first couple of >bits. remembering that 0 in the first position is class A, 10 in the first >two positions indicate class B, and 110 in the first three positions >indicate class C. RIP and IGRP are classful, and would note the classful >values. > >and my apologies for putting this answer into the BGP thread. The news >server ate my post, and...... > > > >""Cebuano"" wrote in message >[EMAIL PROTECTED]">news:[EMAIL PROTECTED]... > > Ladies and gents, > > If you are all aware of the RFC on Private IP Address allocation, it > > specifies > > that 172.16.0.0 uses /12 and 192.168.0.0 uses /16. > > Now does this mean our old friends RIP and IGRP are "aware" of this when >they > > perform the "First-Octet Rule" to apply the mask for these network ranges > > accordingly? > > > > Please someone clarify this subtle issue. > > Thanks. > > > > Elmer ________________________ Priscilla Oppenheimer http://www.priscilla.com Message Posted at: http://www.groupstudy.com/form/read.php?f=7&i=38298&t=38190 -------------------------------------------------- FAQ, list archives, and subscription info: http://www.groupstudy.com/list/cisco.html Report misconduct and Nondisclosure violations to [EMAIL PROTECTED]
