Fault Tolerance Practice Test

A cloud storage service ran on a primary server and a backup server in different data centers. When the primary server crashed during peak use, the system automatically switched users to the backup within seconds, and most people kept uploading files without noticing. The service logged the failure and later repaired the primary server, then restored it as the main system. Based on the scenario described, in the scenario, what role does Failover play?

A small business hosted its website in a cloud service with 2 regions. The website ran in Region 1, but Region 1 had an outage. The cloud provider redirected requests to Region 2 automatically, and customers still browsed products. Later, the provider restored Region 1 and returned traffic gradually. Based on the scenario described, which mechanism ensures system operation when a component fails?