An engineer needs to restrict the database servers that are in the same subnet from communicating with each
other. The database servers will still need to communicate with the application servers in a different subnet. In
some cases, the database servers will be clustered, and the servers will need to communicate with other
cluster members. Which of the following technologies will be BEST to use to implement this filtering without
creating rules?


A. Private VLANs
B. Access control lists
C. Firewalls
D. Control plane policing