@book{253350,
	author = {Forouzan, Behrouz A. and Coobs, Catherine},
	title = {Data communications and networking /},
	publisher = {Tata McGraw-Hill,},
	year = {2012.},
	series = {McGraw - Hill Forouzan Networking Series},
	address = {New Delhi :},
	edition = {2nd ed.}
}