Not a Best Principle to Consider

Answer - B.

The AWS documentation mentions the following.

When connecting multiple VPCs in different AWS Regions, there are some universal network-design principles to consider:

1

Ensure that your VPC network ranges (CIDR blocks) do not overlap.

Make sure the solution you choose is able to scale according to your current and future VPC connectivity needs.

2

Ensure you implement a highly available (HA) design with no single point of failure.

3

Consider your data-transfer needs, as this will affect the solution you choose.

Some solutions proposed below may prove to be more expensive than others based on the amount of data transferred.

4

Use network equipment that supports IPsec VPN tunnels and Border Gateway Protocol (BGP), when applicable.

5

Connect only those VPCs that really need to communicate with each other.

For more information on VPC connectivity across regions, one can visit the below URL:

https://aws.amazon.com/answers/networking/aws-multiple-region-multi-vpc-connectivity/

When connecting multiple VPCs in different AWS Regions, there are several best principles that should be considered to ensure the connectivity is secure, reliable, and efficient. These principles include:

A. Ensure that your VPC network ranges (CIDR blocks) do not overlap: Overlapping CIDR blocks can cause routing issues and make it difficult to manage and troubleshoot the VPC network. It is recommended to use unique CIDR blocks for each VPC and ensure they do not overlap.

B. You should try to connect all VPCs is possible: This statement is incorrect. While it may be desirable to connect all VPCs, it is not always necessary or feasible. It is important to evaluate the business and technical requirements to determine which VPCs need to be connected and the appropriate connectivity options.

C. Ensure you implement a highly available (HA) design: HA design ensures that the VPC connectivity is always available even in the event of failures or disruptions. This can be achieved by implementing redundant connectivity options, such as multiple VPN tunnels or Direct Connect connections, and using redundant network devices.

D. Use network equipment that supports IPsec VPN tunnels and Border Gateway Protocol: IPsec VPN tunnels provide secure communication between VPCs over the public internet. BGP is a routing protocol that allows VPCs to exchange routing information with each other and with on-premises networks. Using network equipment that supports these protocols can simplify the configuration and management of VPC connectivity.

In summary, when connecting multiple VPCs in different AWS Regions, it is important to ensure that CIDR blocks do not overlap, implement a highly available design, and use network equipment that supports IPsec VPN tunnels and BGP. It is not necessary to connect all VPCs, and this decision should be based on business and technical requirements.