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
And 5223 if it’s given as an option.
Only needed for Lync Mobile Push notifications for Lync Mobile client 2010 on iOS devices though.
If Outbound TCP 443 is allowed then Inbound 443 is automatically allowed.
Lync/Skype for Business Client 443 TCP Inbound/Outbound
Lync (Data Sharing Sessions) 443 TCP Outbound
Lync (Video, Audio, Application Sharing)443 TCP Outbound
Lync (Audio & Video) 3478 UDP Outbound
Lync (Audio & Video) 50000-59999 TCP/UDP Outbound
Lync Mobile Push iOS Only 5223 TCP Outbound
According to Microsoft website (https://support.office.com/en-us/article/Office-365-URLs-and-IP-address-ranges-8548a211-3fe7-47cb-abb1-355ea5aa88a2?omkt=en-001&ui=en-US&rs=en-001&ad=US#BKMK_LYO)
CDE
Not A (inbound TCP 443)
And there are other ports: UDP 3479, 3480, 3481
So, the answer should be
CDE