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
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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.