DRAG DROP
Your network contains art Active Directory forest named contoso.com. The forest contains
an Exchange Server 2010 Service Pack 1 (SP1) organization.
You have an internal network and a perimeter network. The network contains the servers
configured as shown in the following table.
You need to configure the firewall that separates the internal network and the perimeter
network.
The configuration must meet the following requirements:
Ensure that inbound email messages can be relayed to Server1.
Ensure that outbound email messages can be relayed to Server3.
Ensure that the list of Exchange recipients is replicated to Server3.
Which TCP ports should you open on the firewall?
To answer, drag the appropriate port number to the correct location in the answer area.
Answer: 
Explanation:
Port 25 needs to be going both ways for sending and receiving mail over SMTP. Then port
50636 is used for the LDAP connection necessary to transfer the list of Exchange recipients
to Server3.