Which two ports should be open between Exchange Online and the on-premises organization?

You have an on-premises Microsoft Exchange Server 2019 organization.

You plan to configure the environment to support a hybrid deployment.

You need to ensure that you can migrate mailboxes from the on-premises organization to Exchange Online.

Which two ports should be open between Exchange Online and the on-premises organization? Each correct answer presents part of the solution. NOTE: Each correct selection is worth one point.
A . 25
B . 80
C . 143
D . 389
E . 443
F . 993

View Answer

Answer: A,E

Explanation:

Reference: https://docs.microsoft.com/en-us/exchange/hybrid-deployment-prerequisites#hybrid-deployment-protocolsports-and-endpoints