システム管理者は、企業の主要な人事アプリケーションの新しいバージョンを実装しています。開発環境がないため、アップグレードは運用サーバーで実行されます。管理者は、アップグレードで問題が発生した場合に備えて計画を立てる必要があります。問題が発生した場合に迅速にロールバックするには、次のどれが最も効果的ですか?
正解:B
A production snapshot is a point-in-time copy of the state and data of a production server or instance. It can be used to restore the server or instance to the exact state it was in when the snapshot was taken, in case of a failure, error, or corruption. A production snapshot can help to ensure a quick rollback in case an issue arises during an application upgrade, as it can revert the changes made by the upgrade and restore the previous version of the application. A production snapshot can also preserve the configuration and settings of the server or instance, as well as the application data and dependencies. A production snapshot is different from a backup, which is a copy of the data only, and may not include the state or configuration of the server or instance. References: CompTIA Cloud+ CV0-003 Study Guide, Chapter 2: Deploying a Cloud Environment, page 75-76; Snapshots vs Backups: Key Differences and Similarities.