Networking Essentials hard
In Cloud Networking (AWS), what is the limitation of VPC Peering compared to a Transit Gateway?
- A Peering connections are fundamentally slower than Transit Gateway routes because they rely on older, single-threaded software-defined networking logic within the cloud fabric.
- B Peering does not support transitive routing; if VPC-A is peered with VPC-B and VPC-B is peered with VPC-C, VPC-A cannot communicate with VPC-C through the middle hub.
- C The peering architecture is inherently insecure because it requires exposing all internal routing tables to the public internet during the initial configuration and peer-discovery phase.
- D Standard VPC peering carries a significantly higher per-gigabyte data transfer cost than the unified Transit Gateway architecture, making it unsuitable for high-volume data movement.
Answer: B. Peering does not support transitive routing; if VPC-A is peered with VPC-B and VPC-B is peered with VPC-C, VPC-A cannot communicate with VPC-C through the middle hub.
VPC Peering is a simple 'wire' between two virtual networks. It's fast and free, but it's not 'transitive'. If you have 50 VPCs and want them all to talk to each other, you'd need to manually create and manage 1,225 individual peering connections (a 'mesh' nightmare). A Transit Gateway acts as a central 'hub-and-spoke' router. You connect all 50 VPCs once to the hub, and they can all reach each other instantly. While the Transit Gateway costs more and adds a tiny bit of latency, its ability to centralize routing, security, and monitoring makes it essential for large, complex cloud architectures.
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