Your company has a subscription to Office 365 for midsize business and enterprises. The company
uses Microsoft Lync Online.
You need to open ports on the network firewall to enable all of the features of Lync Online.
Which port or ports should you open? (Each correct answer presents part of the solution. Choose all
that apply.)
A.
inbound TCP 443
B.
outbound TCP 5061
C.
outbound UDP 3478
D.
outbound TCP 443
E.
outbound UDP 50000 to outbound UDP 59999
F.
inbound TCP 8080
Explanation:
http://ahandyblog.wordpress.com/cloud-technologies/firewall-ports-for-office-365
I would trust the microsoft site answers. go with Answers B,C,D
Open the following ports in your organization’s external firewall:
https://support.office.com/en-us/article/Set-up-your-network-for-Skype-for-Business-Online-operated-by-21Vianet-d21f89b0-3afc-432e-b735-036b2432fdbf?ui=en-US&rs=en-US&ad=US&fromAR=1
Anyone disagree?
sorry it appears the following link above is for Set up your network for Skype for Business Online operated by 21Vianet
Answers A,B,C,D,E appear to be correct….anyone confirm?
Now I found this one to be more correct.
https://docs.pexip.com/lync/ports.htm
All options are the correct answers. ABCDE
From internal > external/O365
Audio: TCP/UDP 50,000-50019
Video: TCP/UDP 50,020-50039
Desktop sharing: TCP/UDP 50,040-50059
From external/O365 > internal
Multiple services: TCP 443, UDP 3478, 3479, 3480, & 3481, TCP/UDP 50,000-59,999
Lync Mobile push notifications: TCP 5223
https://support.office.com/en-us/article/Office-365-URLs-and-IP-address-ranges-8548a211-3fe7-47cb-abb1-355ea5aa88a2?ui=en-US&rs=en-US&ad=US
Answer would be CDE