00369nam a2200121Ia 4500008004100000040001700041041001200058082001400070100004300084245005000127260006000177300001000237230917s9999||||xx |||||||||||||| ||und||  e187328aMAIN  aEnglish  a004.6 I2D  aIndira Gandhi National Open University 0aData communication and networks (MCS-42). 4V.  aNew DelhibIndira Gandhi National Open Universityc2009  av. p.