Two data centers must be able to operate with a stretched Layer 2 network. You are concerned about unnecessary traffic on the Data Center Interconnect (DCI). You do not want packets to trombone over…

Two data centers must be able to operate with a stretched Layer 2 network. You are concerned about unnecessary traffic on the Data Center Interconnect (DCI). You do not want packets to trombone over the DCI, have excessive unknown unicast packet flooding over the DCI, or have excessive ARP flooding over the DCI. Which technology satisfies the requirements in this scenario?