Learn what an AWS Availability Zone is for the AWS Certified Cloud Practitioner CLF-C02 exam. Understand its role in redundancy, fault tolerance, and global infrastructure.
Question
What is an Availability Zone?
A. A location where users can deploy selected AWS services where there is currently no AWS Region
B. One or more discrete data centers with redundant power, networking, and connectivity
C. One or more server clusters onto which new workloads can be deployed
D. A fast content delivery network (CDN) that securely delivers data, videos, applications, and APIs to users globally
Answer
B. One or more discrete data centers with redundant power, networking, and connectivity
Explanation
Availability Zones are physically separate locations within an AWS Region that are engineered to be isolated from failures and connected by low-latency, high-throughput, and highly redundant networking. Each Availability Zone contains one or more data centers that house the servers and storage devices that run AWS services.
An Availability Zone (AZ) is a fundamental component of AWS’s global infrastructure. It refers to one or more physically distinct data centers within a specific AWS Region. These data centers are designed to operate independently from each other to ensure high availability and fault tolerance. Here are the key features of an Availability Zone:
- Redundancy: Each AZ has independent power, cooling, and networking to isolate it from failures in other AZs within the same region.
- Connectivity: AZs within a region are interconnected using low-latency, high-bandwidth fiber-optic networks. This allows for seamless replication of workloads and data across AZs.
- Fault Tolerance: Because no two AZs share the same physical infrastructure, they provide strong isolation against failures such as power outages or natural disasters.
- Scalability: Multiple AZs in a region allow users to distribute applications and workloads for redundancy and scalability.
Why B is Correct
The definition of an AZ aligns with option B: “One or more discrete data centers with redundant power, networking, and connectivity”.
Options A, C, and D describe other AWS services or concepts:
A: This describes Local Zones or regions but not Availability Zones.
C: Refers to server clusters but lacks the redundancy and connectivity aspects.
D: Describes a Content Delivery Network (CDN), such as Amazon CloudFront.
Practical Use Cases of Availability Zones
- High Availability Applications: Deploying applications across multiple AZs ensures resilience against single-point failures.
- Disaster Recovery: Businesses can replicate data across AZs for robust disaster recovery strategies.
- Low Latency Services: Applications can leverage multiple AZs within a region to serve users with minimal latency.
Understanding Availability Zones is crucial for passing the AWS Certified Cloud Practitioner CLF-C02 exam, as it demonstrates knowledge of AWS’s global infrastructure and its role in building reliable cloud solutions.
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