From: KStringer@xxxxxxxxxxxxxxx
Date: Sat May 04 2002 - 01:03:33 GMT-3
Excuse me for not being able to provide an explanation -- my mind is
having an issue communication with my fingers properly :) -- but I can
give a good reference(Caslow/Pavlichenko 2ed. page 708). Hopefully you
can see below with the breakdown of how the 0.0.0.1 network (the 1 being
look for the odd) is masked by 172.22.68.20 to generate the possible
combinations of each octet to permit as many networks as possible with as
few statements as possible.
Network 0 0 0 1
00000000 00000000 00000000
00000001
Mask
Decimal 172 22 68 20
Binary 10101100 00010110 01000100
00010100
Allowed Combinations
0 0 0 1
4 2 4 5
8 4 64 17
12 6 68 21
32 16
36 18
40 20
44 22
128
132
136
140
160
164
168
172
HTH
Regards,
Ken Stringer
Sr. Network Engineer
Cherbonnier, Mayer & Associates, Inc.
CCNA CCDA CNE CCA MCSE + I MCDBA
v. 225-927-9200 x 332
f. 225-761-3815
kstringer@cmaontheweb.com
"Joe Jia" <ellenjjl@rogers.com>
Sent by: nobody@groupstudy.com
05/04/2002 09:38 PM
Please respond to "Joe Jia"
To: <ccielab@groupstudy.com>
cc:
Subject: Two Access-lists
Hi,
Could some explanin the meaning of the next two access-lists from
http://www.cisco.com/univercd/cc/td/doc/cisintwk/intsolns/as5xipmo/sysmgt.htm
?
access-list 5 permit 0.0.0.1 172.22.68.20
access-list 8 permit 0.0.0.1 172.22.68.20
Permits access from a block of addresses at your network operations
center
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