From: Darby Weaver (darbyweaver@yahoo.com)
Date: Fri Dec 07 2007 - 21:52:41 ART
Access Lists.
Assume that the 192.168.15.16/28 network has a
collection of Linux and Windows PCs on it. The
addressing scheme is such that the Linux PCs have the
addresses
192.168.15.17
192.168.15.19
192.168.15.21
and so on through to 192.168.15.29 (odds) while the
Windows PCs have the addresses
192.168.15.18
192.168.15.20
192.168.15.22
and so on through to 192.168.15.30 (even).
All the PCs connect to the core network via a router
on the same subnet.
One day all the Windows PCs get infected by a virus
and start sourcing large amounts of network traffic.
Your task is to create an access list to be used on
the router for the subnet which drops all network
traffic from the Windows PCs while allowing traffic
from the Linux PCs.
Can you create an ACL with just two access list
entries that will match traffic sourced from all the
Windows PCs and drop them while allowing all other
traffic?
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