AWS Certified Advanced Networking Specialty Practice Exam

What is the impact of using multiple Availability Zones for your AWS resources?

1. Increased costs without benefit

2. Improved fault tolerance and availability

3. Reduced data transfer speeds

4. Complexity in network configuration

The correct answer is: Improved fault tolerance and availability

Using multiple Availability Zones enhances fault tolerance and availability for AWS resources significantly. Each Availability Zone operates independently, with its own power supply, cooling, and physical security, which safeguards against potential failures. For instance, if one Availability Zone experiences an outage due to power failure or other issues, resources running in other Availability Zones will continue to operate, ensuring that applications remain available to end users. This architecture allows for the deployment of applications in a way that can withstand failures, improving overall system reliability. Additionally, resources spread across multiple Availability Zones can automatically redirect traffic if one zone goes down, further enhancing resilience. While there may be implications on costs and some complexity introduced in managing distributed resources, the key advantage of using multiple Availability Zones is the enhancement in fault tolerance and service availability, which is vital for critical applications and services that require high uptime.