HOTSPOT
A company plans to deploy an Office 365 tenant.
You have the following requirements:
Administrators must be able to access the Office 365 admin center.
Microsoft Exchange Online must be used as a Simple Mail Transfer Protocol (SMTP) relay for a lineof-business application that sends email messages to remote domains.
All users must be able to use the audio and video capabilities in Microsoft Lync 2013.
You need to configure the ports for the firewall.
Which port should you use for each application? Select the correct answer from each list in the
answer area.
Answer: 
Explanation:
SMTP Relay port should be 587.
https://technet.microsoft.com/en-us/library/dn554323(v=exchg.150).aspx
Please read the entire article you have posted . Port 25 is correcr
Port 25 is correct
TCP port 25 could be used, but TCP port 587 is highly recommended.
I’m not pro at this but I read the question and Technet, maybe you can figure out which port is correct on this quesiton.
Question for realy is:
relay for a lineof-business application that sends email messages to remote domains.
https://technet.microsoft.com/en-us/library/dn554323(v=exchg.150).aspx
IN “How to configure SMTP client submission”
Devices and applications vary in functionality and terminology use. However, these configuration settings will help you set up SMTP client submission.
Enter the settings directly on the device or in the application as the device guide or manual instructs. As long as your scenario meets the requirements for SMTP client submission, these settings will enable you to send email from your device or application.
Port 587 (recommended) or port 25
I’m dying here…
This is the question related to port opening 25 or 587
“Microsoft Exchange Online must be used as a Simple Mail Transfer Protocol (SMTP) relay for a lineof-business application that sends email messages to remote domains.”
Microsoft Exchange Online is an aplication that has to be used as a SMTP relay.
Simple Explanation is :
Is you use an application directly with an Office 365 mailbox, and send mail using SMTP client submission, then port 587 is a MUST. Key words are “SMTP client”
Advanced explanation is taken from the same link that you have been posting :
https://technet.microsoft.com/en-us/library/dn554323(v=exchg.150).aspx
Requirements for Office 365 SMTP relay :
– Static IP address or address range: Most devices or applications are unable to use a certificate for authentication. To authenticate your device or application, use one or more static IP addresses that are not shared with another organization.
– Connector: You must set up a connector in Exchange Online for email sent from your device or application.
– Port: Port 25 is required and must not be blocked on your network or by your ISP.
Key words are “Exchange Online” and ofc :)) port 25.
QED
Correct answer is port 25 if I was not clear enough.
I agree with naruc. Reading the article, it is clear for office 365 to do SMTP relay then only port 25 is needed.
First question is simple “SMTP relay” that is port 25 in O365.
587. 25 is for mta. 587 is for msa
The audio and video ports are the wrong way round.
Port Protocol Direction Usage
50000-50019 RTP/UDP Outbound Audio
50020-50039 RTP/UDP Outbound Video
50040-50059 TCP Outbound Application sharing and file transfer
https://blogs.technet.microsoft.com/nexthop/2013/06/28/lync-online-media-port-changes-offer-better-bandwidth-management/
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