00326nam a2200121Ia 450000500170000000800410001708200170005810000250007524500390010025000120013926000420015130000110019320260205055235.0260111s9999||||xx |||||||||||||| ||und||  a004.6  F769D  aForouzan, Behrouz A. 0aData communications and networking  a4th ed.  aNew DelhibTata McGraw Hill Pubc2007  a1134p.