Exam 200-301 topic 1 question 859 discussion

Wrong, if we do switchport trunk allowed vlan 300 that replaces the previous allowed vlans so they are no longer allowed. You have to "add" vlan 300

You always update the information within the Portchannel information..

I have done practical on it, and C is the most accurate answer for it. For applying the configuration D, it removes the vlan 100, 200. Option C.

I'm confident the correct answer is C. Here's why, based on my lab experience: Option C correctly configures VLANs at the port-channel level. This is essential for EtherChannel bundles where multiple physical interfaces act as one logical link. VLAN configuration at the individual interface level doesn't work. I've tried this, and the changes don't show up in the running configuration of the port-channel itself. PCs on the VLAN couldn't communicate until I used the port-channel command. This confirms that the allowed VLANs must be set on the port-channel, not individual interfaces, for the EtherChannel to function correctly. The Cisco IOS command structure supports this. When you enter "int port-channel 1" and then "sw trunk allowed vlan ?", you get options to "add," "all," "except," "none," and "remove" VLANs, proving that this is the correct configuration level.

Configure the switchport trunk allowed vlan 300 command on interface Fa0/2 on SW1: This would only configure VLAN 300 on a single physical interface (Fa0/2) and wouldn't include it in the EtherChannel (port-channel 1). By adding VLAN 300 to the allowed VLANs on SW1's port-channel 1, both members of the EtherChannel will be able to carry traffic for that VLAN, allowing it to participate in the LACP bundle. C. Configure the switchport trunk allowed vlan add 300 command on SW1 port-channel 1. The show run interface commands reveal that both switches (SW1 and SW2) have LACP configured on their respective interfaces (FastEthernet 0/1 and 0/2) and are assigned to channel-group 1. The allowed VLANs on SW1's port-channel 1 are currently 100 and 200, but not 300. VLAN 300 is missing from the allowed VLANs on the port-channel interface. By issuing the switchport trunk allowed vlan add 300 command on SW1's port-channel 1, you'll enable that port-channel to carry traffic for VLAN 300 in addition to the already allowed VLANs 100 and 200

It´s C

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C is correct

I agree with oatmealturkey, so "C" is the correct answer.

I was thinking about option B, but it is on SW2 which is configured correctly, so in this case we can add vlan 300 to po1, which makes C best choice