000			00445nam a2200181Ia 4500
008			201023s9999||||xx |||||||||||||| ||und||
020			_a978-93-82369-30-1
100			_aKhurana.
245		0	_aData Communication Systems.
250			_a1st.
260			_aNew Delhi _bFirewall _c2009
300			_a239
365			_b175
650			_aComputer Science.
942			_cTB
999			_c3104 _d3104