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For each layer, there are different types of security to protect the network at that layer.
The physical layer is the actual medium in which the data travels. This is usually a wire, hub, or over the air. The physical layer can be secured by protecting access to network cables and ports. Data transmitted over fiber optics is much harder to intercept than data being transmitted over copper wire.
The data link layer establishes the connection for the physical layer and turns the data from higher layers into the bits that will be transmitted across the medium. Security for the data link layer can be accomplished with port security, MAC address filtering, and wireless encryption...
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