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Reference sheets
Scannable sheets for the parts of AWS networking you look up rather than read. Each one is a single page of tables, scope diagrams, and the defaults that bite, with every figure traceable to its source.
These cover the topics a lab cannot. A Direct Connect virtual interface needs a physical cross-connect, and a Cloud WAN core network edge bills by the hour in every Region it runs in, so neither reproduces at the cost the labs hold to. A sheet is the honest format for them rather than a placeholder for a lab that is coming later.
Direct Connect: Virtual Interfaces, Gateways, and Prefixes
What terminates on what, and which direction each prefix control acts in. The allowed-prefixes field means opposite things depending on which gateway you set it on.
Direct ConnectTransit Gateway9 minCloud WAN: Segments, Attachment Policies, and Service Insertion
The object model, the policy document that drives all of it, and the defaults that decide whether two attachments can reach each other. Sharing a segment is hub-and-spoke, not a mesh.
Cloud WANTransit Gateway7 min