00383nam a2200133Ia 4500001000500000005001700005008004100022020001500063082001400078100002500092245005700117260002000174650005500194667920261006003948.0120911s9999    xx            000 0 und d  a0133268284  a004.6 STA  a Stallings, william   aData and computer communications / William Stallings  a Prentice hall   a Data transmission systems   2. Computer networks