00336nam a2200133Ia 4500020000900000082001300009100001800022245006100040250000600101260005700107300000800164500000900172650002100181  aNULL  a621.3851  aHalsall, Fred 0aData communications, Computer Networks, and Open Systems  a-  aSingaporebPearson Education ( Singapore ) Pte. Ltd.  a907  a1664  aNetwork Analysis