000 00276nam a2200109Ia 4500
008 230427s9999 xx 000 0 und d
082 _a004.6
_bGUP
100 _aGupta ( Prakash.C)
245 0 _aData Communications and Computer Networks
260 _bPHI
_aNew DelhI
942 _cBK
999 _c9873
_d9873