VPC Peering & Direct Connect

Amazon VPC Concepts Learning --> Day6

A VPC peering connection is a networking connection between two VPCs that enables you to route traffic between them using private IPv4 addresses or IPv6 addresses.
Instances in either VPC can communicate with each other as if they are within the same network.
An inter-Region VPC peering connection can occur when the VPCs are in different Regions.
A VPC peering connection is a one-to-one relationship between two VPCs.

Two VPCs cannot be connected to more than one VPC peering connection at once.
VPC peering does not support transitive peering relationships. For example, if there are VPC peering connections between VPC A and VPC B, and between VPC A and VPC C, you cannot route traffic from VPC B to VPC C through VPC A.

Name	Default	Adjustable
Active VPC peering connections per VPC	50	Yes
Outstanding VPC peering connection requests	25	Yes
Expiry time for an unaccepted VPC peering connection request	1 week	No

Creating a dedicated connection from an on-premises network to one or more VPCs is simple using Direct Connect.
Compared to internet-based connections, AWS Direct Connect can save network expenses, boost bandwidth throughput, and offer a more reliable network experience.
There are two kinds of connections you can make using AWS Direct Connect

Dedicated connections, where a physical ethernet connection is associated with a single customer.

Hosted connections, where a physical ethernet connection is provisioned by an AWS Direct Connect Partner and shared with you.

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