Data Link Layer: Protocols and Topologies

The data link layer provides a means to exchange data using common local media. It performs two basic services:

  • Allows upper layers to access the media using techniques such as frames.
  • Controls how data is placed in and received from the media using techniques such as media access control and error detection.

The frame is a key element of each data link layer protocol. Data link layer protocols include control information that enables the protocols to function. This control information may indicate:

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