Strebe, Matthew. Firewalls 24 seven / Matthew Strebe , Charles Perkins. - 2nd ed / . - New Delhi : BPB Publications , 2003. - xxvii,517p. : ills,figs ; 24cm . Include index ISBN: Rs. 180.00 (Pbk) Subjects--Index Terms: INTERNET Dewey Class. No.: 004.678 / STR/F