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Module 1: IT Infrastructure & Enterprise Architecture

Understanding Modern Enterprise IT

 1.1 Enterprise Architecture Overview

**Learning Objectives:**

- Understand the layers of enterprise IT infrastructure

- Map business requirements to technical solutions

- Identify integration points between systems

**Core Concepts:**

**1.1.1 Infrastructure Layers**

- **Presentation Layer**: User interfaces, web portals, mobile apps

- **Application Layer**: Business applications, middleware, APIs

- **Data Layer**: Databases, data warehouses, file storage

- **Infrastructure Layer**: Servers, networks, virtualization

- **Security Layer**: Firewalls, IDS/IPS, authentication systems

**1.1.2 Cloud Computing Models**

- **IaaS (Infrastructure as a Service)**: Virtual machines, storage, networks

- **PaaS (Platform as a Service)**: Development platforms, databases

- **SaaS (Software as a Service)**: Microsoft 365, Salesforce, ServiceNow

**1.1.3 Deployment Models**

- **On-Premises**: Complete control, high capital expense

- **Cloud-Only**: Scalability, operational expense model

- **Hybrid**: Balance of control and flexibility

 Lab 1.1: Infrastructure Mapping Exercise