A native VLAN on an 802.1Q trunk port specifies a default VLAN for all untagged traffic that arrives on that port. Any frames received without a VLAN tag are automatically assigned to the native VLAN. This mechanism is essential for network segmentation and provides backward compatibility with devices that do not support VLAN tagging.
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What is 802.1Q and how does it relate to switch ports?
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How does native VLAN configuration impact network segmentation?