What is a requirement to configure a trunking EtherChannel between two switches?
- The allowed range of VLANs must be the same on both switches.
- The participating interfaces must be assigned the same VLAN number on both switches.
- The participating interfaces must be physically contiguous on a switch.
- The participating interfaces must be on the same module on a switch.
Explanation: To enable a trunking EtherChannel successfully, the range of VLANs allowed on all the interfaces must match; otherwise, the EtherChannel cannot be formed. The interfaces involved in an EtherChannel do not have to be physically contiguous, or on the same module. Because the EtherChannel is a trunking one, participating interfaces are configured as trunk mode, not access mode.
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