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Contextual Info: BR E 421/D M O TO R O LA CONTENTS: Chapter 1: T h e O .S.I. m o d el and th e seven layers: 1.1 Introd u ction 1.2 T h e O .S.I. m o d el 1.3 T h e Seven layers: 1.3.1 T h e Physical layer 1.3.2 T h e D ata-L in k layer 1.3.3 T h e N e tw o rk layer 1.3.4 T h e T ran sp o rt layer