principles and practices Tibbs, Richard W. creator Oakes, Edward B. text Upper Saddle River, N.J Pearson/Prentice Hall c2006 monographic xxii, 442 pages : Illustrations ; Includes index. Computer networks -security measures Computer security Firewalls (Computer security) Extranets (Computer networks) QA 76.9 TIB 0131547313 9780131547315 http://catdir.loc.gov/catdir/toc/ecip0512/2005012530.html http://catdir.loc.gov/catdir/toc/ecip0512/2005012530.html