Cloud Networking

Cloud networking provides the virtual network infrastructure — VPCs, subnets, gateways, load balancers, peering, and DNS — that connects workloads within a cloud provider and to external networks, replacing physical cables and appliances with software-defined constructs.

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Don't Panic: Cloud Networking

A virtual network is the cloud version of the cables, routers, and appliances that once occupied a room with a suspicious number of blinking lights. It connects workloads, users, offices, managed services, and the internet through software-defined addresses, routes, gateways, filters, DNS, and load balancers. The hardware did not vanish. It became somebody else's carefully guarded concern, while the decisions about who talks to whom became yours.

The useful mental model is the packet path. Start with the name: DNS must return an address the source can use. Then inspect the route: it chooses a next hop, not permission. Inspect policy next: a firewall or security group can allow a route to remain an exquisitely documented failure. Then check a translation gateway or load balancer. Finally, prove the return path. A connection has two directions because networking, like bureaucracy, has a form for the trip home too.

Address planning matters because CIDR prefixes become future promises. A private IPv4 range can be reused until two networks connect and discover they chose the same numbers. A subnet organizes an address block; it does not become a security boundary by optimism. IPv6 gives more addresses, but it also gives a second path to route, filter, name, observe, and test. A private endpoint and a NAT gateway solve different path problems. Neither grants trust to an application caller.

Read the Intro for the complete architecture and its five checks. The Slides compress the decisions shaping ingress, egress, segmentation, DNS, resilience, and cost. Keep the Cheatsheet nearby when reviewing a route, policy, health check, or failure signal. Use the Practice Reference and Exercise to turn one proposed connection into evidence. The Field Notes cover the operational traps that diagrams omit. The durable habit is pleasingly unglamorous: trace the packet, explain the policy, and prove that the answer can get back.

Don't Panic: Cloud Networking

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