00295nam a2200109Ia 4500008004100000041000800041082001400049100001300063245002100076250001100097260007700108231129s2006    xx            000 0 und d  aeng  a004.6/BLA  aU. Black  aComputer Network  a2nd ed  aPrentice hall of India New DelhibPrentice hall of India New Delhic2006