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AWS Cloud Practitioner Core Concepts

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Question 1

**Statement:** Amazon S3 provides **99.999999999% (11 nines) of durability** for objects stored in S3, meaning data is automatically replicated across at least three Availability Zones in a Region.

Answer choices

  • A. True (Correct)

  • B. False

Explanation

Amazon S3 Standard storage class is designed for 99.999999999% durability (11 nines) — equivalent to losing one object per 10 billion objects stored per year. It achieves this by automatically storing objects redundantly across multiple devices in multiple Availability Zones within a Region. This durability applies to S3 Standard, S3-IA, S3-One Zone-IA, S3 Intelligent-Tiering, and S3 Glacier (except S3 One Zone-IA, which replicates within a single AZ).

Question 2

What is an **AWS Availability Zone (AZ)**?

Answer choices

  • A. A geographic area with multiple data centers

  • B. One or more discrete data centers with redundant power, networking, and connectivity within a Region (Correct)

  • C. A geographic endpoint used to route internet traffic to AWS

  • D. A virtual private cloud that spans multiple regions

Explanation

Availability Zones are isolated data center clusters within a Region. Each AZ has independent power, cooling, and networking to prevent single points of failure. AZs in a Region are connected via high-bandwidth, low-latency links. Deploying applications across multiple AZs provides high availability and fault tolerance—if one AZ fails, the application continues in the others.

Question 3

A company needs to ensure its application **remains available even if an entire AWS Region goes down**. Which architecture strategy BEST achieves this?

Answer choices

  • A. Deploy the application in a single Region with multiple EC2 instances

  • B. Use Multi-AZ deployment within one Region

  • C. Deploy the application across multiple AWS Regions using global load balancing and Route 53 failover routing (Correct)

  • D. Store all data in S3 with versioning enabled

Explanation

Multi-AZ provides protection against AZ failure but NOT Regional failure. For Region-level fault tolerance, the application must be deployed in multiple Regions. Route 53 health checks and failover routing policies can direct traffic to a healthy Region if one becomes unavailable. This is the highest level of availability architecture in AWS and is appropriate for truly mission-critical workloads.

Question 4

Which of the following BEST describes the **cloud computing** model?

Answer choices

  • A. Purchasing and maintaining physical servers in your own data center

  • B. Delivering computing services (servers, storage, networking, software) over the internet with on-demand access and pay-as-you-go pricing (Correct)

  • C. Installing software on-premises that manages all company servers remotely

  • D. A service model where one company owns all its hardware in a co-location facility

Explanation

Cloud computing delivers IT resources on-demand via the internet, allowing organizations to avoid upfront capital expense on hardware and instead pay only for what they use. AWS defines cloud computing as on-demand delivery of IT resources with pay-as-you-go pricing. Key characteristics: on-demand self-service, broad network access, resource pooling, rapid elasticity, and measured service.

Question 5

**Statement:** AWS **CloudFront** is a Content Delivery Network (CDN) that caches content at **Edge Locations** to reduce latency for end users worldwide.

Answer choices

  • A. True (Correct)

  • B. False

Explanation

Amazon CloudFront is AWS's CDN service with 400+ Points of Presence (Edge Locations and Regional Edge Caches) globally. It caches static and dynamic content close to end users, reducing latency and load on origin servers. CloudFront integrates with S3, EC2, Load Balancers, and Lambda@Edge. It supports HTTPS, custom domain names (via Route 53 and ACM), and DDoS protection via AWS Shield.