Distance Vector Algorithm (Bellman Ford)  Computerphile  Summary and Q&A
TL;DR
The BellmanFord algorithm is a distance vector algorithm used to find routes through a network by routers exchanging routing tables.
Key Insights
 ❓ The BellmanFord algorithm is a distance vector algorithm used in pathfinding and network routing.
 🍰 Routers using the BellmanFord algorithm exchange routing tables to determine the shortest paths in a network.
 ❓ The algorithm has been widely used in routing protocols like RIP and IGRP.
 🤝 The counttoinfinity problem is a challenge in the BellmanFord algorithm when dealing with link failures.
 🧑🤝🧑 The algorithm dates back to the 1950s and was popularized by Bellman and Ford, although they were not the original discoverers of the algorithm.
 ❓ The BellmanFord algorithm is still relevant and extensively used in modern networking, including the routing of the internet.
 😒 Border Gateway Protocol (BGP) uses a variation of the BellmanFord algorithm known as path vector routing.
Transcript
we had a brief discussion about um it's pathfinding and networks right yeah it's it's about about finding groups through networks in your previous video mike pound talked about the dykstra algorithm and that's one way of finding your route through the network it's what we call a link state algorithm so today i'd like to talk about a different way o... Read More
Questions & Answers
Q: How does the BellmanFord algorithm differ from the Dijkstra algorithm?
The BellmanFord algorithm is a distance vector algorithm, while the Dijkstra algorithm is a link state algorithm. They both find paths through a network but use different approaches to achieve this.
Q: How do routers in a network using the BellmanFord algorithm exchange information?
Routers in a network using the BellmanFord algorithm exchange routing tables, which contain information about the cost or distance to reach other routers in the network.
Q: What is the counttoinfinity problem in the BellmanFord algorithm?
The counttoinfinity problem occurs when a link in the network fails, but routers still believe they have a route to that destination. This can lead to slow propagation of bad news and incorrect routing information.
Q: What is the significance of the BellmanFord algorithm in networking?
The BellmanFord algorithm is extensively used in routing protocols such as RIP and IGRP. It has been a fundamental routing algorithm since its discovery in the 1950s.
Summary & Key Takeaways

The BellmanFord algorithm is a different approach to pathfinding in networks compared to the Dijkstra algorithm.

Routers in a network using the BellmanFord algorithm exchange routing tables to build a complete map of the network.

The algorithm calculates the shortest paths by updating and exchanging routing tables among routers.