Overview
Module: Module 1: Infrastructure & Addressing
Activity type: Lesson (Orient → Recall → Learn → Explain → Reflect)
Learning objective: Given a host, the learner can read IPv4 address, mask, and gateway; explain network vs host bits; contrast classful charts with classless /24 math; and decide same-LAN vs via-gateway delivery.
Bloom level: Understand / Apply
Mastery unlock for this topic: reading done + Feynman complete + quiz ≥80% (when scored) + lab gate + homework submitted
Learning objective
Given a host, the learner can read IPv4 address, mask, and gateway; explain network vs host bits; contrast classful charts with classless /24 math; and decide same-LAN vs via-gateway delivery.
Why this matters
Every ‘why can’t these containers/hosts talk?’ ticket eventually becomes addressing. If you cannot read IP/mask/gateway, Docker and ARR networking stay superstition.
Prior-knowledge check
Answer briefly before reading Instruction. Wrong answers are useful: they show what to review.
- What does an IP address identify?
- What is a default gateway for?
- What is 127.0.0.1 used for?
Learn
Complete the module reading first:
Then review the worked example inside that reading (I do).
Guided practice (We do)
We do: hints allowed. Check your reasoning against Instruction.
Given two example IPs + /24 mask, decide same-LAN vs needs-gateway together.
Feynman teach-back: required
Required. Do not skip.
Explain
Describe IPv4 addresses, masks, gateways, and why classful charts are history: not how modern LANs work in your own words. No copying the lesson verbatim.
Simplify
Explain the same idea to a 12-year-old. If you use a technical word, define it.
Example
Analogy: street address + ZIP (network) vs apartment number (host), and the post office (gateway) for other ZIPs.
Weak spot
What part was hard to explain? That is where your understanding is thin.
Retry
Return to that part of Instruction, restudy it, then rewrite a clearer explanation below.
Mastery note: a completed Feynman teach-back is required before the next class unlocks: “I get it” without explanation does not count.
Answers save in this browser (localStorage). Completing all five fields is part of the mastery unlock.
Reflection
Which addressing misconception did you personally hold, and what calculation corrected it?
Also answer:
- What did I learn?
- What did I struggle with?
- How does this connect to earlier classes?
Spiral hook
Use this whenever Class 3 Docker networks, Class 5 ARR URLs, Class 10 remote access, or Class 12 Wyoming hosts misbehave. Addressing is a permanent spiral skill.