00355nam a2200133 a 450000500170000002000180001708200150003510000230005024500390007325000120011226000480012430000290017270000200020120251203110918.0  a9788131210451  a004.6bPET  aPeterson, Larry L.  aComputer Networksbsystem approach  a4th Ed.  aNew DelhibMorgan Kaufmann Publishersc2007  axxvii, 806p.c24 cm.cPB  aDavie, Bruce S.