Microsoft 365 Messaging — Question 111

You have an on-premises Microsoft Exchange Server 2019 organization and a firewall that filters all the traffic to and from the organization.

You purchase a Microsoft 365 E5 subscription.

You plan to use the Hybrid Configuration wizard to configure a hybrid deployment between Exchange Online and the on-premises Exchange organization.

You need to identify which ports are required to support configuring the hybrid deployment.

Which two ports should you open on the firewall? Each correct answer presents part of the solution.

NOTE: Each correct selection is worth one point.

Answer options

• A. 25
• B. 80
• C. 443
• D. 995

Correct answer: A, C

Explanation

Ports 25 and 443 are essential for a hybrid deployment between Exchange Online and an on-premises Exchange organization. Port 25 is used for SMTP traffic, which is critical for mail flow, while port 443 is necessary for secure communications over HTTPS. Ports 80 and 995 are not required for this hybrid configuration, making them incorrect choices.