A bank moves tens of terabytes a day between its own datacentre and Azure. It needs predictable throughput, and its regulator objects to that traffic crossing the public internet at all. Which connectivity option should it buy?
Microsoft Certified: Azure Fundamentals (AZ-900), objective architecture-and-services. Azure architecture and services medium
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The options
Correct ExpressRoute
Correct. ExpressRoute is a private connection arranged through a connectivity provider: the traffic does not traverse the public internet, and the circuit is bought at a committed bandwidth rather than depending on whatever the internet is doing today.
Not correct A site-to-site VPN over the internet
Wrong for this requirement. The tunnel is encrypted, but it runs across the public internet, so throughput and latency depend on a path nobody controls — and 'not on the public internet' was stated explicitly.
Not correct A point-to-site VPN from each server in the datacentre
Wrong. Point-to-site connects one device at a time and is designed for individual remote users, not for a datacentre's continuous bulk traffic.
Not correct Virtual network peering to the bank's datacentre network
Wrong. Peering connects two Azure virtual networks. A datacentre is not one, so there is nothing to peer with.
Why
A VPN gateway is a tunnel across the internet; ExpressRoute is a wire that avoids it. The VPN is quick to set up, cheap, and shares the internet's variability; ExpressRoute takes a provider and a lead time and gives higher bandwidth, more consistent latency and no public transit. Site-to-site connects networks, point-to-site connects individual devices, and both are gateway features rather than separate services.
Where this comes from
- Cited
- Microsoft AZ-900 study guide skill area architecture-and-services.compute-and-networking
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