00405nam a2200145Ia 4500001000500000005001700005008004100022020001600063082001400079100004500093245003500138250001200173260002000185650005400205733320261006004020.0120911s9999    xx            000 0 und d  a013-3484831  a004.6 STA  a Stallings,william / van slyke, richard   a Business data communications   a2nd ed.  a Prentice hall   a Data trasmission systems  2.  Computer networks