00561nam a22001812  4500001001100000005001700011008004100028020001700069040001500086100003100101245010000132250001300232260003600245300001700281650004600298700003200344852000300376000001869520151217152133.0100422s         xx           000 0 eng d  a8131203409 :  aKABUcKABU1 aVacca, John R.@000015488610aFirewalls :bjumpstart for network and systems administrators /cJohn R. Vacca, Scott R. Ellis.  a1st  ed.  aLondon :bDigital Press,c2005.  axxx, 416  p. 0aFirewalls (computer security)@00001589531 aEllis, Scott R.@00001780201