Legacy networks often limit cloud flexibility and on-demand scaling due to network limitations, making it challenging to control application network paths across users and business needs. To overcome these challenges, consider upgrading your network architecture, such as using Software Defined Networking, to increase agility, simplify network administration, and reduce operating expenses. By implementing a Landing Zone, which is a scalable configuration that enables companies to adapt the cloud provider's offering to their business needs, you can establish connectivity between the cloud and on-premises data centers, manage IP subnets, DNS domains, TLS certificates, and implement Zero Trust Network Access solutions like Zscaler. Additionally, configuring Layer 3-4 firewall functionality is crucial for proper separation of application and infrastructure networks, ensuring that traffic flowing into existing networks is properly inspected and all corporate firewall rules are enforced. By following these considerations, you can make your cloud migration strategy smoother and more efficient.