Dedicated Peer-to-peer Connection
If you running your services in a hybrid cloud model or if you are in a DC and DR setup you need to have direct links between your clouds or sites. These help ensure -
Minimum latency, better performance If you have third party connections.
Privacy of data in transit between the sites to avoid man in the middle attacks. Be the owner of your entry points.
Fault tolerance with dual ISP links so that if one path fails, another is available.
For data replication you need to have a latency < 1 ms between both sites. This can only be achieved through a direct dedicated connection. For example, MPLS, GCP Direct Connect, Alicloud Express Connect etc.
Some people think a site to site vpn is sufficient to connect two locations, thats not enough. Remember VPN over internet can give you secure connectivity but not the latency
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