What is one main characteristic of the data link layer?
- It generates the electrical or optical signals that represent the 1 and 0 on the media.
- It converts a stream of data bits into a predefined code.
- It shields the upper layer protocol from being aware of the physical medium to be used in the communication.
- It accepts Layer 3 packets and decides the path by which to forward the packet to a remote network.
Explanation: The data link layer (Layer 2) prepares network data for the physical network and enables upper layers to access the media while remaining completely unaware of the type of physical medium used. Without this layer, higher-level protocols like IP would have to be specifically designed to connect to every possible type of media along a delivery path.
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