To optimize file transfers over a saturated 10-Mbps WAN link without a local server in Montreal, BranchCache is required.

1. Server1 (Source): Since the installation files are hosted on a file share (\\Server1\Apps), the BranchCache for network files role service must be installed on Server1 to enable content hashing for the SMB protocol.
2. Montreal Clients (Branch): Because there are no servers in the Montreal office to host a "Hosted Cache," the clients must use Distributed Cache mode. In this mode, the Windows 10 clients cache segments locally and share them with other clients on the same subnet using peer-to-peer discovery.

Microsoft Documentation: "BranchCache" section in Windows Server 2022/2019/2016 Deployment Guide. See "BranchCache for Network Files" under the File and Storage Services role.

Microsoft Documentation: "BranchCache Modes" - specifically the section comparing Distributed Cache Mode (for branch offices without a server) vs. Hosted Cache Mode (requires a local server).

Microsoft Technical Library: "Install the BranchCache for Network Files Role Service" (Procedure for enabling BranchCache on SMB-based file servers).

Microsoft Documentation: "BranchCache Distributed Cache Mode" - detailing peer-to-peer content discovery and sharing for Windows 10 clients in remote subnets.