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Office A has a main SQL Server. &nbsp;Office B has a backup SQL Server they are linked by a WAN link. &nbsp;The SQL Servers use a technology that will allow them to automatically fall over incase of failure. &nbsp;Remote offices have links to Office A via VPN. &nbsp;Would the remote offices need to have VPN links direct to office B so they can access the backup server in case the main server at Office A went down or could they connect to Office A and the traffic be routed through to Office B via the WAN link between A and B. &nbsp;Whats Best ? &nbsp;
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Office A has a main SQL Server.  Office B has a backup SQL Server they are linked by a WAN link.  The SQL Servers use a technology that will allow them to automatically fall over incase of failure.  Remote offices have links to Office A via VPN.  Would the remote offices need to have VPN links direct to office B so they can access the backup server in case the main server at Office A went down or could they connect to Office A and the traffic be routed through to Office B via the WAN link between A and B.  Whats Best ?  

Networking WAN Links

Networking is the process of connecting computing devices, peripherals and terminals together through a system that uses wiring, cabling or radio waves that enable their users to communicate, share information and interact over distances. Often associated are issues regarding operating systems, hardware and equipment, cloud and virtual networking, protocols, architecture, storage and management.

Networking

A router is a networking device that forwards data packets between computer networks. Routers perform the "traffic directing" functions on the Internet. The most familiar type of routers are home and small office cable or DSL routers that simply pass data, such as web pages, email, IM, and videos between computers and the Internet. More sophisticated routers, such as enterprise routers, connect large business or ISP networks up to the powerful core routers that forward data at high speed along the optical fiber lines of the Internet backbone. Though routers are typically dedicated hardware devices, use of software-based routers has grown increasingly common.