The four Ethernet switches in the supported configuration serve two key functions. Firstly, they provide connectivity for NVRAM over iWARP, ensuring that there is high-speed replication of NVRAM data between the systems, which is critical for maintaining data consistency and performance in a multi-site setup. Secondly, they enable SyncMirror replication, which is essential for mirroring the data between the two sites for redundancy and disaster recovery purposes. This ensures that data is consistently available and recoverable in the event of a site failure or other issues.