000 00309nam a2200121Ia 4500
008 160122s9999 xx 000 0 und d
041 _aEnglish
100 _aWilliam A Shay
245 _aUnderstanding data communication and networks
260 _bDelhi:Vikas Pub.
_c2003
300 _a711p.
650 _aComputer
999 _c4643
_d4643