Switching and Routing: The CCNA Core

Deep End Era. Engineering with Sankalp · Oct 29, 2026 · 57m

A ward clerk tidies a loose cable and creates a loop on the hospital's fourth floor. In 2002 the same kind of fault, on a far bigger and messier network, left a Boston hospital on paper for four days. This morning one port shuts itself down and nobody notices. Mei and Arjun find out why, and then go looking for every port where it wouldn't have worked.

Chapters

00:00:00 Opening: a loop on the fourth floor

00:02:20 Boston, November 2002: four days on paper

00:05:27 Radia Perlman and the poem about a tree

00:08:51 VLANs and 802.1Q trunks

00:13:27 Spanning tree by ear: root bridge, port roles…