000 00326nam a2200157Ia 4500
100 _aComer, Douglas E.
080 _a001.64404
526 _dNTB
526 _aUG
366 _f#REF!
942 _cBK
245 _aComputer networks and internets,6th ed.
260 _aPearson
_bNoida
_c2019
300 _a667
546 _aE
999 _c57307
_d57307