Architecture

Essentially a dedicated private connection between on-prem and aws in the high level. Core Components:

Customer Router: Your on-prem router that connects to Direct Connect via a dedicated line.
Direct Connect Location: AWS’s colocation facility where AWS provides a Direct Connect router (partner or AWS-managed).
Cross Connect: Physical fiber link between your router and AWS’s router in the colocation.
AWS Router (DX Router): Terminates the Direct Connect connection; connects to AWS backbone.
Virtual Interfaces (VIFs):
- Private VIF: To access VPC resources.
- Public VIF: To access AWS public services (e.g., S3, DynamoDB).
- Transit VIF: For multiple VPCs via a Transit Gateway. Data Flow:
  On-prem → Customer Router → Cross Connect → AWS DX Router → VIF → VGW/Transit GW → VPC

and More

Direct Connect Connection
BGP
LOA-CFA
Direct Connect Gateway (DXGW)
Transit Gateway
Redundant Connections (for HA)
Link Aggregation Group (LAG)
Router Peer IPs / ASN
Route Tables
Colocation Facility / Partner Network Dedicated private connection to remote network into VPC Hybrid Model VGW is used to setup the connction Consistent network experience and increased bandwidth

AWS Cage | Customer or partner cage for rent a router S2S as backup