DO NOT design your network like this!! // FREE CCNA // EP 6
About this video
He argues that daisy-chaining switches, as in many home and starter business networks, creates single points of failure where one chewed cable or failed switch disconnects everything downstream. To fix this, he introduces Cisco’s hierarchical design: a two-tier, or collapsed core, model with access switches connecting end devices and a powerful multi-layer (Layer 3) distribution switch handling inter-VLAN routing, ACLs, filtering, and distribution, plus redundant links and duplicate distribution switches and routers as budget allows. He then shows a three-tier model for large campuses, adding a separate core layer whose switches, he explains, exist mainly for fast, low-latency, high-reliability forwarding between buildings, citing Cisco Catalyst examples he presents as ranging from 480 Gbps to 25.6 Tbps backplane capacity. He notes he has seen the two-tier collapsed core most often in practice, stresses that redundancy is expensive, and assigns viewers homework to identify their own employer’s design.
Key takeaways
- Daisy-chaining switches creates single points of failure — one link or switch failure takes downstream devices offline
- Two-tier design: access layer for end devices, distribution layer using Layer 3 switches for routing and policy
- Distribution switches handle inter-VLAN routing, ACLs, route filtering, summarization, and next-hop redundancy
- Three-tier design adds a dedicated core layer for high-speed, low-latency transport across a large campus
- Redundancy reduces failure risk but sharply raises cost, so design must match the business budget
Episode details: published September 18, 2020 · 19:36 long. Summary written by Self Growth Videos from the episode itself. Business results and any income figures mentioned are NetworkChuck’s own claims, shared for education — they are not typical or guaranteed.
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