17_1: Introduction

Understanding the distinction between High-Level Design (HLD) and Low-Level Design (LLD) is essential when planning and deploying cloud solutions. These design approaches serve different audiences and phases of a project.

17_2: Definitions

High-Level Design (HLD): A conceptual overview of the architecture, focusing on structure, major components, and relationships.

Low-Level Design (LLD): A detailed and technical specification for implementing each component and configuration.

17_3: Comparison Table

17_4: HLD Components

• Architecture Diagram: VPCs/VNets, zones, regions.

• Major Services: Compute, storage, networking, databases.

• Data Flow: Interaction between services.

• Security Overview: IAM policies, encryption.

• Scalability/Availability: High-level redundancy planning.

• Cost Estimation: Ballpark figures for budgeting.

17_5: LLD Components

• Network Configuration: Subnetting, CIDRs, routing.

• Service Configuration: VM sizes, autoscaling, database tiering.

• Security Policies: NSGs, IAM roles.

• Automation Scripts: Infrastructure-as-code.

• Monitoring and Logging: Tool setup like CloudWatch, Azure Monitor.

17_6: HLD Sample Diagram

17_7: LLD Sample Diagram

17_8: Conclusion

High-Level Design provides a strategic framework and ensures alignment among stakeholders. Low-Level Design ensures the correct technical implementation. Both are complementary and critical for successful cloud-based deployments.