00393nam a2200169Ia 4500008004100000020001800041082001500059100002600074245003200100250000900132260001400141260001700155260000900172300000800181365000800189650002600197231117s9999    xx            000 0 und d  a9789352866601  a005.8 STA   a"Stallings , William" 0aNetwork Security Essential   n6th   aNew Delhi  bPearson Pub.  c2019  a461  b739  aXIMI Computer Science