Overview
Your complete guide to A network that does not fall
Four lessons that make a network survive faults and grow: STP and what stops loops, gateway redundancy with HSRP and VRRP, IPv6 from addressing to operation, and BGP, which joins the whole internet.
Non-technical and technical learners alike. Every part opens two ways in: a plain path built on an analogy for someone starting from zero, and a detailed path for someone who knows the basics and wants depth.
An animation, then what you need before you start, then the idea with code you run, then a worked example, then review cards and "test your understanding" questions.
Do not leave a part before you can answer its questions without guessing. Reading alone proves nothing.
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A look at A network that does not fall
You start inside the building: backup links without loops, and a gateway that does not fall. Then addresses grow with IPv6, then you step out to the internet with BGP.
| Part | Topic | You learn |
|---|---|---|
| 1 | Backup links without loops: STP and EtherChannel | Broadcast storms, the root bridge election, port costs and roles, RSTP, PortFast and BPDU Guard, link bundling with LACP |
| 2 | A gateway that never dies: HSRP, VRRP and DHCP relay | The virtual gateway, HSRP and VRRP with priority and preemption, aligning with the STP root, DORA, DHCP relay and the giaddr field, DHCP snooping |
| 3 | IPv6 in practice: the plan, automatic addresses and dual stack | Address types, a /48 and /64 plan, NDP instead of ARP, SLAAC with the M and O flags and DHCPv6, dual stack, Happy Eyeballs and NAT64, RA Guard and not blocking ICMPv6 |
| 4 | BGP: how the world's networks agree on the road | Autonomous systems and their numbers, eBGP and iBGP, the session on TCP 179, AS_PATH, best-path selection, dual-homing to two providers, route hijacks and RPKI |
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