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RE: Caching a sniffer
From: "Shawn Jackson" <sjackson () horizonusa com>
Date: Wed, 24 Mar 2004 17:36:51 -0800

If someone is running a sniffer on your switched network and has the
ability
to login to your switch, enable port mirroring, and sniff data, you
have much bigger problems than just having a rogue sniffer on the
network.
Incorrect. A switch is basically a hub and router in one.

Routers work on layer 3, not layer 2.

Correct, but there are numerous functions on a switch that operate at
Layer 3
in addition to frame forwarding at Layer 2. Switches can perform IP
based decisions
(ACL's, etc) that operate at the 3rd layer of the OSI model, which
doesn't negate
what I stated. Though a switch is not exclusively a layer 2 device,
neither is a
router exclusively a layer 3 device to hold a IP-to-MAC ARP cache. Most
devices 
have core functionality across multiple layers of the OSI and DOD
models, but terms 
like Switches or Router don't point to a core functionality at a
specific layer, but 
rather a action the device performs, i.e. a router routes data across 
different interfaces much like a switch 'routes' data across interfaces
(switch-ports).

Shawn Jackson
Systems Administrator
Horizon USA
1190 Trademark Dr #107
Reno NV 89521

www.horizonusa.com
Email: sjackson () horizonusa com
Phone: (775) 858-2338
       (800) 325-1199 x338

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