What is the purpose of the native VLAN feature on the Juniper Networks EX Series Switches?

On Juniper Networks EX Series switches, a trunk port is designed to carry traffic for multiple VLANs by utilizing 802.1Q tagging. By default, a trunk port will drop any untagged frames it receives. The primary purpose of the native VLAN feature (configured via the native-vlan-id statement) is to enable a trunk port to accept untagged incoming traffic and logically assign it to the specified native VLAN. It also ensures that outgoing traffic belonging to that specific VLAN is forwarded as untagged frames.

A. Access ports inherently accept and forward untagged traffic by default; they do not require the native VLAN feature to perform this function.

B. The native VLAN feature does not assign a VLAN tag to access ports; it is a feature specifically configured on trunk ports to handle untagged traffic.

D. The native VLAN feature does not restrict or filter traffic on a trunk port; it simply dictates how untagged frames are categorized and processed.

- Juniper Networks, "Understanding Bridging and VLANs," Junos OS Layer 2 Configuration Guide, Section: Native VLANs on Trunk Ports.

- Juniper Networks, "Configuring VLANs for EX Series Switches," Junos OS Ethernet Switching, Section: Trunk Ports and Untagged Traffic.