00297nam a2200121Ia 4500008004100000020001500041082001900056100001800075245003100093260003800124300000800162650000500170140316s9999    xx            000 0 und d  a817656074X  a004.65bBRE/MA  aBrenton,Chris  aMastering network security  aNew DelhibBPB Publicationsc1999  a672  a