000 00324nam a2200133Ia 4500
008 210113s9999 xx 000 0 und d
082 _a004.6 DOU-C
100 _aDouglas Comer
245 _aComputer networks and internets
250 _a6th
260 _bPearson Education
_aNew Delhi
_c2019
300 _a667
942 _cBK
999 _c54585
_d54585