Explanation/Reference:
Explanation:
The Front End Transport service will always attempt to route the first delivery attempt of the message to the Transport service on one of the servers in the New York site. For incoming messages with a single mailbox recipient, the Front End Transport (FET) service will select a mailbox server in the target delivery group, and give a higher priority to whichever mailbox server has the closest proximity based on the Active Directory site topology. In this scenario, the target delivery group is a routable DAG, and the Active Directory site with the closest proximity to the FET instance on EX01 is the Transport Service on EX01 or EX02 in New York.
The Front End Transport service will not always attempt to route the first delivery attempt of the message to the Transport service on EX01. While the Transport service on EX01 is a possibility, there is no guarantee that it will be the target of the first delivery attempt from the FET service. All servers in the New York site are equal candidates for being targeted.
The Front End Transport service will not always attempt to route the first delivery attempt of the message to the Transport service on EX03. EX03, as well as any server in the Los Angeles site, would not be targets of the first delivery attempt from the FET service on EX01 because they are not within the closest proximity.
The Front End Transport service will not always attempt to route the first delivery attempt of the message to the Transport service on one of the servers in the Los Angeles site because they are not within the closest proximity, based on the Active Directory topology.