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Here's why:
Multiple FastConnect connections from different physical locations: This provides the highest level of redundancy. By having FastConnect connections from different on-premises locations (e.g., different data centers) and terminating them in different OCI Availability Domains or even different OCI regions, you minimize the risk of a single point of failure affecting your connectivity. If one FastConnect connection or location goes down, the other can take over.
Multiple Site-to-Site VPN connections as a backup: While FastConnect is preferred for primary connectivity due to its performance and reliability, having multiple VPN connections as a backup offers an additional layer of redundancy. If all FastConnect connections fail (though highly unlikely with proper design), the VPN connections can provide a failover path, albeit with potentially lower bandwidth.
Why the other options are less ideal:
A). A single Site-to-Site VPN connection with multiple tunnels: While multiple tunnels within a single VPN connection provide some redundancy, they still rely on a single CPE (Customer Premises Equipment) and a single internet connection on the on-premises side. A failure of either of these would disrupt all tunnels.
B). A single FastConnect connection with multiple virtual circuits: Multiple virtual circuits on a single FastConnect connection provide redundancy within the FastConnect service itself (e.g., if a physical port fails). However, they still rely on a single physical connection to OCI. A failure of that physical connection would disrupt all virtual circuits.
D). A single FastConnect connection with a Site-to-Site VPN connection as a backup: This is better than options A and B, but it still has a single point of failure on the FastConnect side. If the FastConnect connection fails, you rely solely on the VPN, which may not provide sufficient bandwidth for all workloads.