Lesson 6 - ICND1(1.5a) Describe the purpose and basic operation of the protocols in the OSI and TCP models

Physical Layer 1
Maps to TCP/IP Model Network Interface Layer 

Examples: Physical wiring and equipment

Communication using bits.

Data-Link Layer 2
Maps to TCP/IP Model Network Interface Layer

Examples: Ethernet / Token-Ring / PPP

Communication using frames.

 Be familiar with the sublayers of Layer 2.

Network Layer 3
Maps to TCP/IP Model Internet Layer  

Examples: IP / IPv6

Communication using packets.

Transport Layer 4
Maps to TCP/IP Model Transport Layer 

Examples: TCP / UDP

Communication using Segments.

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Coming up in part B


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