N Is For Networking N4N013: Spanning Tree Part 1 – An Introduction and Broadcast Storms
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Feb 13, 2025 Dive into the mysterious world of spanning tree as fundamental concepts are unpacked. Discover how this protocol prevents loop problems in Ethernet networks. Learn about the critical differences between unicast, multicast, and broadcast transmissions, along with their implications. The discussion delves into the architecture of network switches, showcasing the roles of various components in fast data transfer. Plus, hear a personal story about the chaos caused by broadcast storms and how modern networking techniques tackle these challenges.
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Ethernet's Lack of TTL
- Ethernet lacks a Time To Live (TTL) concept, unlike other network protocols.
- This absence of TTL allows frames, especially broadcasts, to loop indefinitely in the presence of network loops.
Unicast, Multicast, and Broadcast Frames
- Unicast frames have a specific destination MAC address.
- Broadcast frames are sent to everyone on the network, while multicast frames target a specific group of devices.
Broadcast Storm Anecdote
- Ethan Banks recalls witnessing a broadcast storm caused by a cabling issue.
- The storm caused excessive blinking on the switch, prompting immediate action to unplug the cable.