Chapter 2. Plan and implement networking and security in Office 365

If you are using a custom DNS domain with Office 365, you must configure this domain with appropriate DNS records to ensure that your organization’s clients are able to find the appropriate Office 365 servers on the Internet. Office 365 requires that clients be able to connect directly to the Office 365 servers on the Internet using a variety of protocols and ports. If the clients cannot make these connections, Office 365 functionality may be limited. As is the case with on-premises Active Directory, Office 365 supports different administrative roles. In large organizations, these roles can be used to allow IT staff, such as those that work on the service desk, to perform support ...

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