CyberCode Academy

Course 29 - AZ-500 Microsoft Azure Security Technologies | Episode 4: Protecting Azure Virtual Networks

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In this lesson, you’ll learn about implementing and securing Azure Virtual Networks (VNETs) for robust cloud network protection:Virtual Network Foundations
  • Understanding VNET architecture in Microsoft Azure:
    • Defining private IP ranges using CIDR notation
    • Configuring custom DNS settings
    • Segmenting networks into subnets for isolation
  • Service Endpoints:
    • Creating secure, direct connections to Azure services (e.g., Storage, SQL)
    • Keeping traffic within the Microsoft backbone instead of the public internet
Virtual Network Peering
  • Connecting multiple VNETs across regions securely
  • Enabling:
    • VNET-to-VNET communication over Microsoft’s backbone
    • Gateway transit for shared VPN/ExpressRoute access
  • Supporting scalable architectures like hub-and-spoke models
Network Security Groups (NSGs)
  • Using NSGs as stateful firewalls to control traffic flow
  • Applying rules based on the five-tuple model:
    • Source IP
    • Source port
    • Destination IP
    • Destination port
    • Protocol
  • Leveraging service tags to simplify rule management for Azure services
Application Security Groups (ASGs)
  • Grouping virtual machines by role (e.g., Web, App, Database tiers)
  • Applying security policies based on logical groupings instead of IPs
  • Simplifying rule management in complex environments
Hands-On Security Implementation
  • Building a secure lab environment:
    • Deploying a Windows bastion host for controlled access
    • Creating a Linux application server
  • Applying strict access controls:
    • Restricting RDP access to a trusted public IP only
    • Allowing SSH communication between authorized internal systems
    • Blocking all traffic by default
Key Takeaways
  • VNETs provide network isolation and segmentation in the cloud
  • Security is enforced through layered controls (NSGs + ASGs + endpoints)
  • Proper design (e.g., bastion hosts, least access rules) significantly reduces attack surface
This lesson builds a strong foundation for securing Azure infrastructure by combining network design, access control, and practical implementation strategies.

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