Question 420
A company places two redundant application servers in one Availability Zone and calls that zone fault tolerance. Which observation would BEST demonstrate the chosen approach meets the need?
Explanation
Correct Answer
A simulated AZ outage leaves at least one healthy instance in another AZ. This result is directly relevant because Multiple machines inside one AZ can still share the same zone failure domain. The underlying AWS decision is: Use more than one AZ when the business requires protection from an AZ outage. The ongoing safeguard is: Inventory shared storage and networking dependencies by AZ.
Incorrect Answers
Regions are distinct geographic locations and matter for data location and supported services. In this question, however, multiple machines inside one AZ can still share the same zone failure domain. The answer that meets the requirement is: A simulated AZ outage leaves at least one healthy instance in another AZ.
Using multiple AZs protects against some zone failures but not every potential regional disruption. In this question, however, multiple machines inside one AZ can still share the same zone failure domain. The answer that meets the requirement is: A simulated AZ outage leaves at least one healthy instance in another AZ.
Global content delivery and regional data residency can be planned as separate concerns. In this question, however, multiple machines inside one AZ can still share the same zone failure domain. The answer that meets the requirement is: A simulated AZ outage leaves at least one healthy instance in another AZ.