What is a Layer 2 port channel?

A Layer 2 port channel refers to a logical interface that aggregates multiple physical links into a single logical link, enhancing bandwidth and providing redundancy. Specifically, it is comprised of EtherChannel access ports or trunk ports, which means that it can either carry untagged traffic for access ports or tagged and untagged traffic for trunk ports.

This logical interface operates at Layer 2 of the OSI model, allowing network devices like switches to treat multiple physical connections as a single connection. This aggregation helps to improve overall network performance by increasing throughput and eliminating the potential for a single point of failure in the connection.

The other choices do not accurately describe a Layer 2 port channel. A physical interface for high-speed Ethernet connections pertains to the actual ports used to establish the physical layer 1 connections, but it does not capture the logical nature of a port channel. The default interface for VLAN configurations and a Layer 3 routing interface for static routes are concepts that apply at different layers of the OSI model and operate under different protocols and configurations, thus are not relevant to the definition of a Layer 2 port channel.