What is the recommended action to take when you need to move traffic away from one backend server during maintenance in a multi-server pool?

• A. Disable the backend service entity targeted for change.
• B. Disable the backend server entity targeted for change.
• C. Disable the load-balancing vServer.
• D. Unbind the correct server entity from the load-balancing vServer.

Answer: (D)

When you need to move traffic away from one backend for maintenance, remove that backend from the load-balancing pool bound to the vServer. Unbinding the backend server from the load-balancing vServer stops new requests from being directed to that server while leaving the rest of the pool to handle traffic. This approach is targeted and minimizes disruption: other healthy servers continue to serve users, and you can rebind the server after maintenance is complete.

Disabling the backend service or the backend server can disrupt health checks and may not immediately exclude the node from rotation, depending on configuration. Disabling the entire vServer would take down all backends behind it, which is much more disruptive. Unbinding provides a precise, quick way to divert traffic away from the specific server.