Port Security is a Network Access Control (NAC) feature that limits the number of MAC addresses allowed on a single switch port, thereby preventing unauthorized devices from connecting to the network. This feature is pivotal in maintaining control over which devices can access network resources, enhancing security at the network access layer. MAC filtering is a related concept but is primarily focused on creating allow/deny lists for MAC addresses rather than limiting the number of connections on a port. 802.1X is a more robust NAC mechanism that provides a full authentication framework before granting network access, which is different from the direct Layer 2 control offered by Port Security.
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How does Port Security limit the number of devices on a port?
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How does Port Security differ from 802.1X authentication?
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What happens if an unauthorized MAC address is detected on a port with Port Security enabled?