Explanation/Reference:
Explanation:
EDGE1 is an Exchange Server 2010 computer
CAS-8 would be an Exchange Server 2013 computer
Typically, you would enable the anti-spam agents on a mailbox server if your organization doesn't have an Edge Transport server, or doesn't do any prior anti-spam filtering before accepting incoming messages.
Connection Filtering agent is only available on the Edge Transport server role. Exchange 2013 does not have an Edge Transport server role yet.
The Connection Filter agent and the Attachment Filter agent are only available on an Edge Transport server.
The following features have been discontinued in Exchange Server 2013:
Anti-spam agent management in the EMCIn Exchange 2010, when you enabled the anti-spam agents

on the Hub Transport server, you could manage the anti-spam agents in the Exchange Management Console (EMC). In Exchange 2013, when you enable the anti-spam agents in the Transport service on a Mailbox server, you can't manage the agents in the Exchange admin center (EAC). You can only use the Exchange Management Shell. For information about how to enable the anti-spam agents on a Mailbox server, see Enable Anti-Spam Functionality on a Mailbox Server.
Connection Filtering agent on Hub Transport servers In Exchange 2010, when you enabled the anti-

spam agents on a Hub Transport server, the Attachment Filter agent was the only anti-spam agent that wasn't available. In Exchange 2013, when you enable the antispam agents in the Transport service on a Mailbox server, the Attachment Filter agent and the Connection Filtering agent aren't available. The Connection Filtering agent provides IP Allow List and IP Block List capabilities. For information about how to enable the anti-spam agents on a Mailbox server, see Enable Anti-Spam Functionality on a Mailbox Server.Note: You can't enable the anti-spam agents on an Exchange 2013 Client Access server. Therefore, the only way to get the Connection Filtering agent is to install an Exchange 2010 or Exchange 2007 Edge Transport server in the perimeter network. For more information, see Use an Edge Transport Server in Exchange 2013.
References:
http://technet.microsoft.com/en-us/library/bb124320(v=exchg.150).aspx
http://technet.microsoft.com/en-us/library/jj619283(v=exchg.150).aspx