What is the purpose of setting the native VLAN separate from data VLANs?

Question:
What is the purpose of setting the native VLAN separate from data VLANs?

• The native VLAN is for routers and switches to exchange their management information, so it should be different from data VLANs.
• A separate VLAN should be used to carry uncommon untagged frames to avoid bandwidth contention on data VLANs.
• The native VLAN is for carrying VLAN management traffic only.
• The security of management frames that are carried in the native VLAN can be enhanced.

Explanation: Routing and Switching Essentials
6.1.1 Overview of VLANs

When a Cisco switch trunk port receives untagged frames (unusual in well-designed networks), it forwards these frames to the native VLAN. When the native VLAN is moved away from data VLANs, those untagged frames will not compete for bandwidth in the data VLANs. The native VLAN is not designed for carrying management traffic, but rather it is for backward compatibility with legacy LAN scenarios.

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