Ethernet standards can be confusing, and there are a bunch of Ethernet reference pages on the WWW, but none are so thorough and accurate as the original, Charles Spurgeon's Ethernet Web Site.
Elsewhere on the net, Anixter has put together in a reasonable Wire & Cable Handbook that contains standards reference books as well as some proprietary white papers -- still worthy of mention. For some excellent white papers on various media analysis check out Agilent's White Papers and Application Notes. These papers will give you an idea of what proper cabling and implementation does for the electrical signaling.
Purdue recently unveiled a new initiative within information security. Their CERIAS Project is a welcome consolidation of their -- and others -- efforts. Purdue's COAST program was historically the first stop on the Internet for security information (and really still is with the immature status of CERIAS.)
The National Institute of Standards and Technology has developed a Computer Security Resource Center with many papers available. Of particular interest is Security in Open Systems. Their training library has numerous "must read" papers.
The University of California, Davis, Department of Computer Science has a Computer Security Labratory with many papers and ongoing projects that are worthy of a visit and deserving of continuing support.
The SANS Institute is a great organization. Their What Works is good overview of useful security defense tools, and their Reading Room is another great resource.
While sometimes slow to release information (it's usually available elsewhere first), the CERT Coordination Center is the official and definitive security site on the Internet. CERT publications and other security information are available from Cert Staff Pulications, while CERT advisories and bulletins are also posted on the USENET newsgroup comp.security.announce. Someone within your organization should consider being on the CERT mailing list for automated delivery of their advisories and bulletins.
Take a look at Seawall's Computer Forensics Library for some great leads in forensics.
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