Azure Networking Challenges: Routing Strategies, and Load Balancing for Multi-Tier IoT Application

Hey community, It's been a while since I've been working on configuration of a complex network architecture in Microsoft Azure for a multi-tier application. I've successfully set up virtual networks, subnets, and security groups, but I'm encountering challenges in establishing efficient communication between different tiers and ensuring optimal traffic flow. Specifically, I'm interested in best practices for implementing Network Security Groups (NSGs) and effective routing strategies. Additionally, insights on leveraging Azure Load Balancers to enhance the scalability and resilience of my application would be greatly appreciated. If anyone has experience with similar configurations or can offer advice on optimizing Azure networking for multi-tier applications, I'd be grateful for your expertise. Thank you!