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 line-of-business application that sends email messages to remote domains.
-All users must be able to use the audio and video capabilities in Microsoft Skype for Business.
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:
Transport Control Protocol(TCP), User Datagram Protocol (UDP) ports, and Protocol Numbers are important to TCP/IP networking, intranets, and the Internet. Ports and protocol numbers provide access to a host computer.
However, they also create a security hazard by allowing uninvited access. Therefore, knowing which port to allow or disable increases a network’s security. If the wrong ports or protocol numbers are disabled on a firewall, router, or proxy server as a security measure, essential services might become unavailable.
TCP port 25 is used for simple mail transfer protocol which is used to e-mail routing between mail servers.
TCP port 443 is used for Audio, video and application sharing sessions as well as data sharing sessions.
RTP/UDP port 50020-50039 must be used for outbound video sessions.
RTP/UDP port 50000-50019must be used for outbound audio sessions.