What information contributes to the load balancing decision across a LAG?

Load balancing across a Link Aggregation Group (LAG) is crucial for optimizing network performance and efficiently utilizing multiple links. The correct choice involves a combination of Layer-4, Layer-3, and Layer-2 addresses because:

1. Layer-2 Addresses: MAC addresses at this layer are essential for identifying the devices communicating on the Ethernet network. They help in determining the source and destination of data packets.

2. Layer-3 Addresses: IP addresses come into play at this layer and are critical for routing and determining the appropriate paths for data packets between networks or devices.

3. Layer-4 Information: This layer includes protocols like TCP and UDP, which contain port numbers. These ports identify specific applications or services, making them vital for traffic distribution, especially when multiple sessions or connections are established between the same endpoints.

By utilizing a combination of address information from these three layers, a switch can effectively create a more granular load balancing mechanism to distribute traffic evenly across the available links in the LAG. This approach minimizes congestion and maximizes throughput, ensuring optimal performance of the network.