00321nam a2200133Ia 4500001000500000005001700005008004100022020001500063082001400078100001800092245003800110260001800148650002100166346720261006003716.0120911s9999    xx            000 0 und d  a0131660918  a004.6 BLA  aBlack, Uyless  aComputer networks / Uyless Black.  aPrentice Hall  aComputer network