Step 2: Secure and configure your network
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Some of the most common Office 365 performance issues are related to network configuration. Assessing your network configuration and applying network principals and best practices is a key step in ensuring the best possible Office 365 user experience.
Review Network Planning, Optimization, and Best Practices
The topic Office 365 network connectivity overview is a good place to start to understand the basic principles of Office 365 networking. Then, read Office 365 Network Connectivity Principles to understand how to optimize network performance.
You can also review the network planning, best practices, and optimization guides available at this link.
Configure Connectivity to Microsoft IPs and URLs
To move to Microsoft 365 Education, you need to enable network connectivity to the Microsoft cloud and services. Ensure that you configure your firewalls and network devices for connectivity to the IPs and URLs defined in the topic Managing Office 365 endpoints.