TCP-IP Layers

TCP/IP Model (like all the other models) breaks the functions into small TCP-IP Networking Layers with each layer describing a category of functions which includes Standards & Protocols.

Physical Layer:

  • Focuses on Bits transmission over each Link using Protocols like Ethernet, 802.11 (Wi-Fi).

Data Link-Layer:

  • Focuses on sending Data over one type of Physical Link (E.g. Ethernet, WLAN, etc.) using Protocols like Ethernet 802.3, 802.11 (Wi-Fi)

Network Layer:

  • Focuses on delivering the Data from the original sending Computer to the final destination Computer using Protocols like IP & ICMP

Transport Layer:

  • Focuses on the Applications needed for sending & receiving the Data using Protocols like TCP & UDP.

Application Layer:

  • Focuses on the Applications needed for sending & receiving the Data using Protocols like HTTP, POP3, SMTP.

Reference:

CCNA 200-301 OCG, Volume 1, Pg. 18-19 - Wendell Odom .

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