The /7 is actually a supernet which encompasses 64.0.0.0 - 65.255.255.255 so
the ACL is correct. Just like the DSG states if you break down the 64.0.0.0/7
you end up with two /8's (64.0.0.0/8 and 65.0.0.0/8). Sometimes it's best to
break this down into binary
64 = 01000000
65 = 01000001
So you only have one bit of difference in the binary, this could also be
calculated by subtracting (255 - 254 = 1) giving you a wildcard mask of
1.255.255.255.
HTH
From: [email protected]
[mailto:[email protected]] On Behalf Of khaled al-ajeman
Sent: Monday, November 08, 2010 9:38 PM
To: [email protected]
Subject: [OSL | CCIE_RS] question regarding v.1 lab 8 question # 8.15
Hi there,
The question says,
Routes in the 64.0.0.0/7<http://64.0.0.0/7> range should not be allowed in your
network at all. The access-list used should contain a single line.
the answer as follows:
access-list 15 permit 64.0.0.0 1.255.255.255 -------) I need more help in
this part I could not understand this access-list at all.
rouer rip
offset-list 1 in 16
thank,
khaled
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