正解:B
The action that must be performed before renumbering a Cisco UCS chassis is to re-acknowledge the chassis.
Re-acknowledging the chassis is a process that forces the Cisco UCS Manager to rediscover the chassis and its components, such as the I/O modules, the power supplies, and the fans. Re-acknowledging the chassis is necessary before renumbering the chassis, because it ensures that the Cisco UCS Manager has the latest information about the chassis and its configuration. Re-acknowledging the chassis also allows the network engineer to apply any pending configuration changes or policies to the chassis and its components.
Re-acknowledging the chassis can be done from the Cisco UCS Manager GUI or CLI, by selecting the chassis and choosing the Re-Acknowledge option. References :=
* Implementing and Operating Cisco Data Center Core Technologies (DCCOR) v1.2, Module 5: Cisco Unified Computing System, Lesson 5.1: Cisco UCS Architecture
* Cisco UCS Manager GUI Configuration Guide, Release 4.0, Chapter: Managing Chassis, Section:
Re-Acknowledging a Chassis