000 00307nam a2200121Ia 4500
008 160122s9999 xx 000 0 und d
041 _aEnglish
100 _aWilliam A Shay
245 _aUnderstanding Data Communication and Networks
260 _bDelhi:vikash pub
_c1998
300 _a711p.
650 _aComputer
999 _c715
_d715