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Large enterprises typically use NIDS - network intrusion detenction devices ( http://en.wikipedia.org/wiki/Network_intrusion_detection_system ). These are usually on a span port on the switch so they don't impact latency. Alternatively you might go for NIPS - network intrusion prevention which must be inline on the network and therefore is likely to alter ...
A lot of anti-malware 'heuristic'-engines do this kind of stuff. They check entropy of chunks of code, or even the entire PE. Lots of malware is obfuscated to exist longer in the wild. The problem with this kind of detection is that is works poorly with smart-er attackers. eg when I write exploits, I randomize everything keep things small and you will ...
The page lists the affected systems and your windows 7 32bit is not included: Affected Avaya DefinityOne Media Servers Avaya IP600 Media Servers Avaya S3400 Message Application Server Avaya S8100 Media Servers Microsoft Windows 2000 Advanced Server SP1, SP2, SP3, SP4 Microsoft Windows 2000 Datacenter Server SP1, SP2, SP3, SP4 Microsoft Windows 2000 ...
Yes, there are some appliances that incorporate wireless router + IDS or IPS. For example, check out this Watchguard access point.
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