000 00292nam a2200109Ia 4500
008 230222s9999 xx 000 0 und d
100 _aWilliam A Shay
245 0 _aUnderstanding Data Communications and Networks
250 _a2
260 _bThomas Asia Pvt Ltd, Singapore
_c2001
942 _cBK
999 _c11238
_d11238