Physical Layer

From amongst the TCP-IP Layers, the First Layer is the Physical Layer.

  • HTTP asks for the Web pages from a Web Server, TCP provides guaranteed delivery through Error recovery feature, Network Layer's IP provides Addressing & Routing feature for Intra-Network connectivity, Data Link-Layer's Ethernet provides Inter-Network Connectivity & Physical Layer's Layer specifies the cabling and energy (for example, electrical signals) that flow over the cables for the Data-Link Layer Protocols.

  • Physical Layer converts this whole Frame into binary bits Transmit them over a Physical Medium.

Reference:

CCNA 200-301 OCG, Volume 1, Pg. 25 - Wendell Odom .

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