What is the first action that must be taken before removing a standby supervisor module...

In theFLDTEC course, the process for removing or replacing asupervisor module— especially thestandbysupervisor— in a modular switch like theCisco MDS 9700is clearly outlined. Cisco documentation states:

"Before removing a standby supervisor module, it must first be placed into out-of-service mode using the CLI command system no supervisor <slot-number> or via the appropriate management interface."

This action ensures the systemacknowledges the supervisor is no longer participating in redundancy, allowing a safe and controlled removal without impacting system operations.

Why not the other options?

A. Shut down the entire switch→ Not required; MDS switches are built for high availability and allow hot-swap operations.

C. Disconnect all network interface cables→ This applies to line cards or interfaces, not to supervisor removal specifically.

D. Perform a manual failover→ Failover is requiredwhen removing the active supervisor, not the standby one.