Explanation/Reference:
Explanation:
Edge Subscriptions are used to populate the Active Directory Lightweight Directory Services (AD LDS) instance on the Edge Transport server with Active Directory data. Although creating an Edge Subscription is optional, subscribing an Edge Transport server to the Exchange organization provides a simpler management experience and enhances antispam features.
To deploy an Edge Transport server and subscribe it to an Active Directory site, follow these steps:
Install the Edge Transport server role.

Prepare for the Edge Subscription:

On the Edge Transport server, create and export an Edge Subscription file by running the New-

EdgeSubscription cmdlet.
Copy the Edge Subscription file to a Mailbox server or a file share that's accessible from the Active

Directory site containing your Mailbox servers.
Import the Edge Subscription file to the Active Directory site by running the New-EdgeSubscription

cmdlet on the Mailbox server.
Scenario: Fabrikam connectivity requirements include:
Connections for inbound and outbound email must be initiated and terminated from an Edge Transport server in the perimeter network.
References: https://technet.microsoft.com/en-us/library/aa997438(v=exchg.160).aspx
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2. To deploy an Edge Transport server and subscribe it to an Active Directory site, follow these steps:
1. Install the Edge Transport server role.
2. Prepare for the Edge Subscription:
3. On the Edge Transport server, create and export an Edge Subscription file by running the NewEdgeSubscription cmdlet.
4. Copy the Edge Subscription file to a Mailbox server or a file share that’s accessible from the Active Directory
site containing your Mailbox servers.
5. Import the Edge Subscription file to the Active Directory site by running the New-EdgeSubscription cmdlet
on the Mailbox server.