DDI fundamentals8 min
What is DDI?
See how DNS, DHCP, and IPAM work as one operational system—and why managing them together matters.
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Build DDI knowledge you can use.
Free, practical lessons that connect standards to real network operations. Start with the fundamentals, follow a path, or jump straight to the problem you need to solve.
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From first principles to field practice
6 lessons and growing
01
Start hereDDI fundamentals
Build the mental model for DNS, DHCP, IPAM, and the lifecycle that connects them.
02
Build confidenceOperations
Turn protocol knowledge into reliable day-to-day investigation and stewardship.
03
Go deeperSecurity
Understand the controls that protect naming, addressing, and network trust.
Lesson library
Learn one topic at a time
DDI fundamentals10 min
How DNS resolution works
Trace a lookup from the stub resolver through recursive and authoritative DNS, including caching and common failure points.
DDI fundamentals9 min
DHCP DORA and the lease lifecycle
Understand Discover, Offer, Request, Acknowledge—and what happens when a client renews, moves, or loses its lease.
Operations11 min
IPAM as an operational source of truth
Move beyond address spreadsheets by modeling ownership, intent, utilization, and the lifecycle of every network block.
Security12 min
DNSSEC and the chain of trust
Learn what DNSSEC validates, how trust moves from parent to child zones, and why signing is not encryption.
Operations10 min
A repeatable DDI troubleshooting method
Use scope, evidence, and dependency checks to move from “the network is broken” to a defensible root cause.
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