Cloud networking is the invisible foundation that determines whether data pipelines are secure, fast, and reliable. A misconfigured Virtual Private Cloud leaves databases exposed to the internet; subnets placed in the wrong availability zones create single points of failure; overly permissive security groups create security vulnerabilities that are exploited within hours of creation. Data engineers do not need to become network engineers, but they must understand the core networking primitives well enough to provision secure infrastructure and diagnose connectivity problems when pipelines fail to connect to their dependencies.
AWS Virtual Private Cloud (VPC) is the foundational networking service on AWS — every EC2 instance, RDS database, and Redshift cluster runs inside a VPC. A VPC is a logically isolated network where the customer controls the IP address range, subnets, routing tables, and network gateways. The equivalent services on other clouds are Google Cloud VPC Networks and Azure Virtual Networks — all implement the same logical isolation model with slightly different naming conventions. Understanding VPCs on AWS transfers almost directly to GCP and Azure.