DevOps Networking
7 parts · about 97min total. Written in order — start at part 1.
- Lesson 01 — What Networking Means in DevOps, and IP Addresses
Networking from zero: why machines need to reach each other, who hands out IP addresses, how the world ran out of them, and what IPv6 fixes.
- Lesson 02 — Ports
How ports identify which program on a machine a request is for, who claims them, the permission rule for low numbers, and why every request carries a source port too.
- Lesson 03 — Network Models and Layers
What a network layer actually is, where the official numbers and names come from, and how encapsulation nests the message like envelopes inside envelopes.
- Lesson 04 — DNS
How DNS turns names into numbers by walking a chain of delegation, why caching and TTL exist, and who actually runs, sells, and rents out domain names.
- Lesson 05 — DHCP
How DHCP automatically hands a joining computer its number, DNS runner, and way out through a four-line conversation, and why the number is a lease rather than a gift.
- Lesson 06 — MAC Addresses and ARP
Why every device carries a second, factory-burned address, how the Layer 2 envelope and ARP handle the final metres of delivery, and why the MAC envelope is rewritten at every hop while the IP envelope crosses the world untouched.
- Lesson 07 — Routing
Since Lesson 01, one phrase has carried the whole story: junctions read the address and "pick a direction." The MAC lesson sharpened it — the IP envelope crosses the world untouched while each hop reads 140.82.121.4 and decides which way to pass it.