000 00299nam a2200121Ia 4500
008 160122s9999 xx 000 0 und d
041 _aEnglish
100 _aWilliam A Shay
245 _aUnderstanding data communication & Network
260 _bDelhi:TMH
_c2001
300 _a711p.
650 _aComputer
999 _c4368
_d4368