When configuring interfaces to be part of the same EtherChannel, which of the following should you configure identically? (Choose four answers.)

In configuring interfaces to be part of the same EtherChannel, certain parameters must be identical to ensure proper synchronization and functionality. These parameters include:

• Duplex: The duplex settings for each interface must match. Mismatched duplex settings can lead to performance issues and packet loss due to collisions or other communication errors.

• Access VLAN on an access port: For EtherChannels that operate in access mode, all ports must be configured with the same access VLAN. If the access VLAN is different on any of the participating interfaces, it could lead to traffic being improperly directed or dropped.

• Speed: The speed settings on each interface must also be identical. Different speeds between ports in an EtherChannel can cause instability and performance problems, as the channel relies on consistent bandwidth from all member interfaces.

• Allowed VLANs on a trunk: In the case of trunk ports, the allowed VLANs must be the same across all member interfaces. If one port allows a different set of VLANs, it could disrupt the flow of traffic destined for VLANs not included on all links.

Aligning these configurations ensures that the EtherChannel operates smoothly, maintaining a single logical link that provides increased bandwidth and redundancy while avoiding any segmentation that could arise from differences in configuration.