VPC Peering: A Comprehensive Guide

What is VPC Peering:
VPC Peering is an Amazon Web Service (AWS) feature enabling data exchange between two separate Virtual Private Clouds (VPC). By using Amazon's private network infrastructure, it ensures secured, fast, and efficient communication between two VPCs.

Why is VPC Peering Important:
VPC Peering plays a crucial role in providing cost-effective, low-latency network traffic between VPCs, which can be within the same AWS Region or across different Regions. This can enhance application performance, security and also supports resource sharing across several AWS accounts.

How it Works:
Once a peering connection is established between two VPCs, they function as if they are on the same private network. These VPCs can communicate using private IP addresses, eliminating the need for public IPs, VPN connections, or separate physical hardware.

Exam Tips: Answering Questions on VPC Peering:

• Remember that VPC Peering is not transitive. A cannot reach C through B.
• VPC Peering can be established between VPCs in different AWS accounts or Regions.
• There's no single point of failure for communication or bandwidth bottleneck with VPC Peering.
• A maximum of 125 peering connections can be established per VPC.

Using these key points, answering related questions on the exam should be straightforward. You should understand the key features and limitations of VPC Peering and apply these principles to different hypothetical scenarios presented in the exam questions.