A Cisco switch currently allows traffic tagged with VLANs 10 and 20 across trunk port Fa0/5. What is the effect of issuing a switchport trunk allowed vlan 30 command on Fa0/5?

Question:
A Cisco switch currently allows traffic tagged with VLANs 10 and 20 across trunk port Fa0/5. What is the effect of issuing a switchport trunk allowed vlan 30 command on Fa0/5?

• It allows VLANs 1 to 30 on Fa0/5.
• It allows VLANs 10, 20, and 30 on Fa0/5.
• It allows only VLAN 30 on Fa0/5.
• It allows a native VLAN of 30 to be implemented on Fa0/5.

Explanation: The switchport trunk allowed vlan 30 command allows traffic that is tagged with VLAN 30 across the trunk port. Any VLAN that is not specified in this command will not be allowed on this trunk port.

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