Which switch command makes VLAN 10 untagged across a trunk link?
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Correct answer: switchport trunk native vlan 10.
Why this is the answer
The command switchport trunk native vlan 10 configures VLAN 10 as the native VLAN on a trunk link. The native VLAN is the only VLAN that sends and receives untagged frames across a trunk. All other VLANs traversing the trunk will have an 802.1Q tag. switchport trunk encapsulation dot1q specifies the trunking protocol, but doesn't define which VLAN is untagged. switchport trunk allowed vlan 10 permits VLAN 10 to traverse the trunk, but doesn't make it untagged; it would still be tagged unless it's also the native VLAN. switchport mode trunk enables trunking on the interface, but doesn't specify the native VLAN.
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