AWS Direct Connect

AWS Direct Connect is a dedicated network connection between your on-premises network and AWS.
It bypasses the public internet, offering higher bandwidth, lower latency, and improved security.
In order to achieve the same we can also use Transit Gateway or VPN.
Take time in initial setup. Minimum one month.
Faster compared to VPN because we using dedicated bandwidth.

How it works?

To connect with VPC it uses Virtual Interface (can be private or public). It will be public in case if we want to connect AWS resources outside VPC such as DynamoDB and S3 with on premises. Private Interfaces is used to connect our VPC with on premises using Direct connec.

Direct Connect is a dedicated connection, meaning that it is not shared with other customers. This provides you with predictable performance and bandwidth.
Direct Connect is a secure connection, as it is encrypted using SSL/TLS.
Direct Connect is a scalable connection, as you can increase or decrease your bandwidth as your needs change.
Direct Connect is a flexible connection, as you can choose from a variety of options to meet your specific requirements.
We can have VPN over direct connect to encrypt all of our traffic.

Enhanced Performance: Lower latency and higher bandwidth for critical applications.
Improved Security: Dedicated connection reduces exposure to internet-based threats.
Cost Reduction: Potential cost savings compared to internet-based connections, especially for high-bandwidth transfers.
Hybrid Cloud Integration: Seamless integration of on-premises and cloud environments.

Direct Connect pricing is based on several factors, including:

Location: The location of the Direct Connect location.
Connection Type: The type of connection (private, public, transit).
Bandwidth: The amount of bandwidth provisioned for the connection.
Data Transfer: The amount of data transferred (OUT from AWS) over the connection.

Connection Type	Virtual, software-based	Physical, dedicated network connection
Latency	Higher latency due to network hops	Lower latency, direct connection
Bandwidth	Limited by internet connection	Higher bandwidth, scalable to meet specific needs
Security	Vulnerable to internet-based threats	More secure, dedicated connection
Cost	Lower initial cost, higher ongoing costs for data transfer	Higher initial cost, lower ongoing costs for high-bandwidth transfers

Feature	Transit Gateway	Direct Connect
Purpose	Connects multiple VPCs within a single AWS account or across multiple accounts	Connects your on-premises network to AWS
Connectivity	Virtual, software-based	Physical, dedicated network connection
Use Cases	Centralized routing, simplified network management	Hybrid cloud connectivity, high-bandwidth, low-latency