00458nam a2200157Ia 4500008004100000020001500041082001400056100002200070245004800092250000800140260003300148300002900181500001900210600002100229650005000250240925s9999    xx            000 0 und d  a9812400508  a004.6 SHA  aShay ,William  A. 0aUnderstanding Data Communication & Networks  a2nd  aLondon:bThomas learc,1999.  axxiv,447p.bNAfOriginal  aIncludes Index  aComputer Science  aComputer science, information & general works