Updated- AWS Certified Solutions
Architect – FINAL EXAM: Expert
Answers *Q&A* (100% Correct)
2025/2026 |VERIFIED|
What is the purpose of an Amazon VPC (Virtual Private Cloud) and how does it differ from a traditional
network?
An Amazon VPC allows you to create a private network within AWS, where you can launch AWS
resources in a virtual network you define. Unlike traditional networks, VPCs allow you to isolate and
control resources with specific IP address ranges, subnets, route tables, and network gateways. You can
also connect your VPC to your on-premises network using a VPN.
Explain the difference between EC2 On-Demand Instances and Reserved Instances.
EC2 On-Demand Instances allow you to pay for compute capacity by the hour or second with no
long-term commitments. Reserved Instances, on the other hand, require you to commit to a specific
instance type and region for a one or three-year term in exchange for a discounted rate.
How does Amazon S3 ensure data durability?
Amazon S3 ensures data durability by storing data across multiple devices and facilities within an
AWS Region. S3 automatically replicates your data across different availability zones (AZs), achieving an
annual durability of 99.999999999% (11 nines).
What are security groups in AWS, and how do they work?
Security groups in AWS are virtual firewalls that control inbound and outbound traffic to EC2
instances. They function at the instance level and allow you to specify rules for allowed IP ranges, ports,
and protocols. Security groups are stateful, meaning that if you allow inbound traffic, the corresponding
outbound traffic is automatically allowed.
What is an IAM role, and when would you use it in AWS?
An IAM role is an AWS identity with specific permissions that can be assumed by AWS services,
applications, or users to perform tasks on your behalf. Roles are commonly used for granting permissions
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,to EC2 instances, Lambda functions, or other AWS resources that need to interact with AWS services
securely.
Describe the difference between a load balancer and an auto scaling group in AWS.
A load balancer distributes incoming application traffic across multiple EC2 instances to ensure
high availability and reliability. An Auto Scaling group, on the other hand, automatically adjusts the
number of EC2 instances in response to traffic demands, scaling in or out based on policies you define.
How does Amazon Route 53 work for DNS management?
Amazon Route 53 is a scalable Domain Name System (DNS) web service that translates domain
names to IP addresses. It can route traffic to AWS services or any endpoint, provide domain registration,
and offer health checks and routing policies like weighted and latency-based routing.
Explain the function of an AWS VPC Peering Connection.
A VPC Peering Connection allows two VPCs to communicate with each other using private IP
addresses. This connection enables traffic to be routed between VPCs as if they are part of the same
network, allowing for secure, isolated communications between resources across VPCs.
What is the purpose of an Amazon RDS instance?
Amazon RDS (Relational Database Service) is a managed database service that simplifies setting
up, operating, and scaling a relational database in the cloud. It supports multiple database engines, such
as MySQL, PostgreSQL, MariaDB, Oracle, and Microsoft SQL Server, and handles routine tasks like
backups, patching, and scaling.
What are the advantages of using Amazon CloudFront for content delivery?
Amazon CloudFront is a Content Delivery Network (CDN) that accelerates the delivery of static
and dynamic web content to end users. It reduces latency by caching content at edge locations
worldwide and improves user experience with lower latency, high availability, and scalability.
What is the AWS shared responsibility model?
The AWS shared responsibility model outlines the security and compliance responsibilities
between AWS and the customer. AWS is responsible for the security of the cloud infrastructure,
including hardware, software, and networking, while customers are responsible for securing their data,
applications, and other configurations within the AWS environment.
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, How do you ensure high availability in a multi-AZ deployment for RDS?
High availability in Amazon RDS can be achieved by using the Multi-AZ deployment feature, which
automatically replicates the database to a standby instance in a different availability zone. This ensures
failover capability in case of an issue with the primary instance, minimizing downtime.
What is Amazon Elastic File System (EFS) and when would you use it?
Amazon EFS is a scalable file storage service that allows multiple EC2 instances to access a
common file system concurrently. It is ideal for use cases that require shared access to data, such as
content management systems, home directories, or big data analytics.
Explain the concept of AWS Availability Zones.
AWS Availability Zones (AZs) are distinct data centers within an AWS region, each with its own
power, networking, and cooling. AZs allow for high availability by distributing resources across multiple
locations within a region, reducing the risk of a single point of failure.
What is the difference between Amazon S3 and Amazon Glacier?
Amazon S3 is a highly durable and scalable object storage service used for frequently accessed
data. Amazon Glacier is a low-cost archival storage service designed for infrequently accessed data that
requires long retrieval times, typically used for backup and archival storage.
How does AWS Lambda function work in serverless architecture?
AWS Lambda allows you to run code without provisioning or managing servers. You can upload
your code, and Lambda automatically handles scaling, execution, and billing. It is event-driven and
typically used for serverless applications, such as image processing or data transformation.
What is Amazon DynamoDB, and how does it scale?
Amazon DynamoDB is a managed NoSQL database service that provides fast and predictable
performance at any scale. It automatically scales up or down to adjust capacity and maintains high
availability, making it ideal for high-traffic, low-latency applications.
What is the purpose of AWS Elastic Beanstalk?
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