Microservices vs Monolithic Applications

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Questions and Answers

What is the primary benefit of using microservices over monolithic applications?

If one component fails, others can still function. (correct)

Microservices are easier to manage as a single unit.

Microservices require fewer resources to operate.

Microservices ensure all components are tightly integrated.

Which scenario illustrates the concept of multiple topics in Amazon Simple Notification Service?

A coffee shop calls each customer to provide updates.

A coffee shop sends a single newsletter with all updates.

A coffee shop has separate newsletters for different interests. (correct)

A coffee shop uses social media for all announcements.

What issue does the use of Amazon Simple Queue Service help to address?

It simplifies the ordering process for customers.

It reduces delays when one component is busy. (correct)

It allows messages to be lost during transmission.

It eliminates the need for customer orders altogether.

In a monolithic application, what happens when one component fails?

The entire application can experience failure. Signup and view all the answers

Which of the following statements about microservices is true?

Microservices provide greater flexibility in component updates. Signup and view all the answers

What is a key characteristic of Amazon Simple Notification Service (SNS)?

SNS allows messages to be sent based on subscriber preferences. Signup and view all the answers

What corresponds to the scenario of a cashier placing orders into a queue?

Orders are processed even if the barista is busy. Signup and view all the answers

What advantage does low latency provide for cloud users?

Reach a global audience with minimal delays Signup and view all the answers

Which benefit of microservices is NOT accurate?

They eliminate the need for component dependency management. Signup and view all the answers

Which of the following is a key feature of Amazon EC2?

Quick launch of virtual servers Signup and view all the answers

What is a significant difference between Amazon EC2 and traditional servers?

Amazon EC2 offers a pay-as-you-go pricing model Signup and view all the answers

Which option describes how to set up security for an EC2 instance?

Define rules to control network access Signup and view all the answers

How does Amazon EC2 allow users to manage their virtual servers?

Programmatic access and user access methods Signup and view all the answers

What is a benefit of using a deployment model that combines cloud and on-premises resources?

Cost-saving and avoidance of maintenance headaches Signup and view all the answers

Which statement best describes the process of connecting to an EC2 instance?

Instances can be accessed programmatically or through user login Signup and view all the answers

What are Reserved Instances best suited for?

Long-term, steady-state applications Signup and view all the answers

What can be done during the 'Use' phase of an EC2 instance?

Set up and run software Signup and view all the answers

What is a key feature of EC2 Instance Savings Plans?

They provide discounts for a specified hourly spend. Signup and view all the answers

Which of the following is a characteristic of Spot Instances?

They can be used at reduced rates for unused EC2 capacity. Signup and view all the answers

What is the primary benefit of Dedicated Hosts?

The ability to run applications with existing licenses. Signup and view all the answers

Which statement accurately describes On-Demand Instances?

They are billed only for the resources used, without a long-term contract. Signup and view all the answers

What does scalability refer to in the context of resource management?

The ability to adjust resources based on current demand. Signup and view all the answers

What is a common use case for Spot Instances?

Tasks where interruptions are acceptable and cost savings are crucial. Signup and view all the answers

How do EC2 Instance Savings Plans compare to Reserved Instances?

They offer more flexibility in instance type and size. Signup and view all the answers

What is the primary benefit of using Infrastructure as Code in managing your environment?

It allows for scripts to define and manage your infrastructure. Signup and view all the answers

What is the purpose of an Internet Gateway in an Amazon VPC?

To enable resources in the VPC to communicate with the internet. Signup and view all the answers

Which component is responsible for allowing secure access to your VPC from an external network?

Virtual Private Gateway Signup and view all the answers

Which statement accurately describes the functionality of AWS Direct Connect?

It establishes a dedicated private connection between on-premises data centers and AWS. Signup and view all the answers

How does Amazon VPC help in managing network traffic?

By isolating your virtual network from others in AWS. Signup and view all the answers

What happens if an error occurs during the management of resources under Safe Management?

The changes are automatically rolled back to a previous state. Signup and view all the answers

Which of the following best describes a subnet within an Amazon VPC?

It is a smaller section that divides the VPC for resource management. Signup and view all the answers

What is a primary feature of Elastic Beanstalk in AWS?

It automates deployment and management of applications. Signup and view all the answers

What is the main advantage of using EBS snapshots?

They save data blocks that have changed since the last snapshot. Signup and view all the answers

Which statement about Amazon S3 storage classes is true?

S3 Standard-IA has the highest retrieval fee compared to S3 Standard. Signup and view all the answers

What statement best describes Instance Stores?

They are designed for temporary storage and data is lost if the instance stops. Signup and view all the answers

What is a key feature of Amazon S3's object structure?

Each object consists of data, metadata, and a unique key. Signup and view all the answers

Which storage class should be chosen for data that is infrequently accessed but requires high availability?

S3 Standard-IA Signup and view all the answers

What is the maximum file size limit for an object stored in Amazon S3?

5 TB Signup and view all the answers

What is a characteristic of S3 Standard storage class?

Stores data across at least three Availability Zones. Signup and view all the answers

What happens to data stored in Instance Stores when the associated EC2 instance stops?

Data is lost permanently. Signup and view all the answers

Study Notes

Monolithic Applications vs. Microservices

Monolithic Applications: All components are tightly integrated; a failure in one part can lead to total application failure.
Microservices: Components are loosely connected and can operate independently, minimizing total failure risk.
Real-world Analogy: A single coffee shop with a few registers exemplifies monolithic design, while a coffee shop with multiple registers for different tasks illustrates microservices.

Amazon Simple Notification Service (Amazon SNS)

Purpose: Facilitates sending notifications to multiple subscribers using topics.
Functionality: Publishers send messages to topics; subscribers get messages based on their preferences.
Single Topic Example: A centralized newsletter from a coffee shop that sends all updates to every subscriber.
Multiple Topics Example: Separate newsletters for specific interests, allowing subscribers to choose topics they want.

Amazon Simple Queue Service (Amazon SQS)

Purpose: A messaging service that ensures reliable message delivery between components without loss.
Functionality: Messages are queued, processed, and then removed.
Order Fulfillment Without a Queue: Direct communication between cashier and barista can lead to delays.
Order Fulfillment With a Queue: Cashier uses a queue system to place orders, allowing smoother workflow.

Amazon EC2 Overview

Virtual Servers: Provides flexible, resizable virtual instances in the cloud; charges only for usage time.
Traditional Servers Comparison: Traditional setups entail upfront costs, delayed delivery, and manual configuration.
Benefits of EC2: Quick to launch, pay only for used compute time, and easily adaptable based on needs.

Amazon EC2 Instance Management

Launch Process: Choose a template, define instance type, and set security rules before initiating instances.
Connection: Methods include programmatic access for applications and user logins for management.
Utilization: Software installation, file management, and storage expansion are key tasks performed on EC2 instances.

EC2 Pricing Models

On-Demand Instances: Pay-as-you-go for unpredictable workloads.
Reserved Instances: Commit to usage for discounts on long-term applications.
EC2 Instance Savings Plans: Provides flexible usage commitments for cost savings.
Spot Instances: Utilizes unused capacity at significantly reduced rates, suited for interruptible workloads.
Dedicated Hosts: Physical servers exclusively for your use, ideal for licensing compliance but at higher costs.

Scalability in Amazon EC2

Definition: Scalability allows adjusting resource counts based on demand.
Implementation: Uses scripts for environment management and auto-provisions resources.
Management Tools: AWS Console for interfaces, CLI for automation, Elastic Beanstalk for deployment, and CloudFormation for code-managed infrastructure.

Amazon Virtual Private Cloud (Amazon VPC)

Definition: A service to create a private network on AWS, isolating resources.
Components: Includes virtual networks and subnets for resource allocation.
Internet Gateway: Connects VPC to the Internet, allowing external traffic.
Virtual Private Gateway: Provides secure connections from external networks via VPN.

AWS Direct Connect

Definition: Establishes dedicated connections between data centers and AWS to enhance performance and security.
Advantages: Efficient data transfer by saving only changed data blocks, leading to cost-effective storage solutions.

Amazon Simple Storage Service (Amazon S3)

Definition: A service for file storage as objects in buckets, offering unlimited capacity.
Object Structure: Each object contains data, metadata, and a unique key.
Key Features: Offers permissions control and versioning for object management.

S3 Storage Classes

S3 Standard: For frequently accessed data; high availability across multiple zones.
S3 Standard-IA: For infrequent access but needs availability; lower storage cost with higher retrieval fees.
S3 One Zone-IA: Lower cost for rarely accessed data that can be recreated; data stored in a single zone.

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Description

This quiz explores the differences between microservices and monolithic applications, highlighting their definitions, issues with monolithic systems, and practical examples. Understand how these architectural styles impact application design and functionality in the modern software development landscape.