00491nam a22001217a 4500020002400000082001500024100003700039245005500076260004100131300003700172500001900209650014100228  a9788131790625 (pbk)  a004.6bDUM  aDumas, Barry M.aMorris Schwartz  aPrinciples of computer networks and communications  aNew DelhibDorling Kindersley c2012  axxviii, 519 p.b: ill.c; 24 cm.  aIncludes index  aComputer networksaComputer network-CommunicationvDigital signalsvElectrical mediavAnalog datavDigital datavInternet protocolosvFC