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FURTHERREADING:Asapreviewforfurtherreading,thefollowingreferencehasbeenprovidedfromthepagesofthebookbelow:Title:TMNTelecommunicationsManagementNetworkAuthor:DivakaraK.UdupaPublisher:McGraw-HillISBN:00706581538081Figure4-1OSIlayerconcepts.++++82Figure4-2OSIserviceproviderandOSIserviceuser.8384Figure4-3Requestorandrespondermessages.8586