001: 975
003: Starlibrary PMS 4.5
005: 20180420
020: ^a0-256-23044-7
066: ^abe.D
072: ^aBasic Concepts
082: ^a001.66
100: ^abehrouz forouz
240: ^aData Communica tions and Netuorksng
245: ^aData Communica tions and Netuorksng
260: ^c1998
650: ^aIntroduction
650: ^aThe OSI Models