**Why VPC Peering**: Direct private connectivity without traversing the public internet—lower latency, no egress charges for cross-account traffic within the same region. **Architecture**: (1) In Account A, create a peering connection request to Account B using peer account ID and VPC ID. (2) Account B accepts. (3) Update route tables in both VPCs—add routes to peer CIDR via pcx-xxx. (4) Update security groups to allow peer CIDR....
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