Pop Quiz

Pop Quiz: Office 365: Opening Firewall Ports

Applies to the "Administer Exchange and Lync Online" objective of Exam 74-342.

Q: A company's network administrator needs to configure the network firewall to allow for Lync Online full functionality giving users the ability to use file transfers, audio and video, presence updates with contact pictures, and Microsoft Outlook integration.

Which of the following outbound ports need to be open on the firewall? (Choose three.)

  1. TCP 443
  2. UDP 3478
  3. UDP 50000-59999
  4. UDP 443

Answer and explanation are below.

Answer is A, B and C: Fully functionality requires outbound firewall ports TCP 443, UDP 3478, and UDP 50000 - 59999 for file transfers, audio, video, application sharing, presence updates and Microsoft Outlook integration with Office 365 Lync Online.

Quick Tip: Lync CNAME and SRV records are also needed in an external DNS server when hosting a company domain name.


Bonus Question: A company's user need to manage all sub sites for a company's SharePoint Online Office 365 intranet sites. Which permission can be assigned that requires the minimum effort? (The answer, of course, will be revealed next time!)

Answer to bonus question from last time: Get-MailUser | FL Name,RecipientTypeDetails,ExternalEmailAddress is the PowerShell command used to display a list of all mail-enabled users in a Microsoft Exchange Online environment.

About the Author

Andy Barkl, MCT/MCITP/MCSA, A+, Network+, Security+, CCNA has been studying technology for 30 years. Of the last 15 years, he has spent much of his time parting the knowledge and experience he has gained through IT exams, over 300, to help others be prepared and successful. He teaches classes in Phoenix, Ariz. where he has lived most of his life. He can be reached by e-mail at [email protected].

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