2.The OSI Reference Model

2.1.The OSI Model

2.2.Layer 1: The Physical Layer

2.3.Layer 2: Data Link Layer

2.4.Layer 3: The Network Layer

2.5.Layer 4: The Transport Layer

2.6.Layer 5: The Session Layer

2.7.Layer 6: The Presentation Layer

2.8.Layer 7: The Application Layer