Define the role of an Ethernet switch in Carrier Ethernet architecture.

The role of an Ethernet switch in Carrier Ethernet architecture is to forward Ethernet frames based on MAC addresses. Ethernet switches operate at Layer 2 of the OSI model, which is the data link layer. Their primary function is to receive incoming frames, examine the destination MAC address, and then determine the appropriate port to forward the frame to its intended recipient.

This process allows for efficient data communication across the network by minimizing unnecessary traffic on other ports. Switches use a MAC address table, learning the addresses of devices connected to each of their ports, enabling them to make intelligent forwarding decisions. As a result, they facilitate the creation of a local area network (LAN) or connect multiple LANs, which is essential in Carrier Ethernet solutions to ensure that data is accurately delivered to the right destination while maintaining effective bandwidth utilization.

The other options describe functions that are not typical roles of an Ethernet switch. Encrypting data packets is usually handled at higher layers, optical signal conversion is more relevant to media converters or optical network technologies, and monitoring network performance may involve separate tools or management software, rather than the fundamental function of an Ethernet switch itself.