CompTIA Cloud+ Practice Test

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What upgrade approach allows for sequential updates without causing system downtime?

Rolling
Blue-green
Hotfix
Snapshot

The correct answer is: Rolling

The rolling upgrade approach is designed to implement updates in a sequential manner, allowing groups or segments of a system to be upgraded one at a time. This method minimizes the overall impact on system availability, as only part of the system is taken offline during the update process. By upgrading components in a staggered fashion, services remain operational, and users can continue to access the system without experiencing significant downtime. In contrast to rolling upgrades, other methods like blue-green deployment involve switching between two whole environments, which can lead to brief periods of unavailability during the transition. Hotfixes generally apply immediate fixes rather than a series of updates, and snapshots are used for backup purposes rather than for systematic upgrades. This makes rolling upgrades particularly effective in environments where continuous availability is crucial, such as cloud services and enterprise applications.