Data-Link Layer

From amongst the TCP-IP Layers, the Second Layer is the Data-Link 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 with the help of Ethernet Headers & Trailers (encapsulated by Data-Link Layer).

  • Data-Link Layer uses the same Data-Link Layer Standard over all these different Physical links (within that Ethernet LAN).

  • The most commonly used LAN Data-Link Layer protocol is Ethernet & WAN Data-Link Layer protocols are High-Level Data Link Control (HDLC) and Point-to-Point Protocol (PPP).

Reference:

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

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