Discussion
A transit gateway is used instead of many peerings when
Answer: A
Correct answer: many networks must be interconnected
Peering is point to point, so a fully connected mesh grows as the square of the number of networks and becomes unmanageable quickly. A transit gateway acts as a hub: each network attaches once, and routing between them is handled centrally. For two networks a peering is simpler and cheaper; the hub earns its cost as the count rises.
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