Distance Vector Routing Algorithm Part-1Explained in Hindi l Computer Network Course

Summary

This video explains the Distance Vector Routing (DVR) algorithm, focusing on its application in network routing. It covers the creation and updating of routing tables by routers, where each router calculates the shortest path to various destinations using distance vectors. The video highlights how routers exchange information to update their tables, ensuring efficient packet delivery. The routing table consists of destination routers, distance (cost), and the next hop for each destination. Through iterative updates and exchanges, routers converge on the best paths for communication across the network.

Takeaways

• 😀 Distance Vector Routing (DVR) is a network routing protocol that aims to find the shortest path for packet delivery using distance vectors exchanged between routers.
• 😀 The routing table in DVR contains three primary columns: Destination Router, Cost/Distance to the destination, and the Next Hop router to forward the packet.
• 😀 The Distance Factor plays a crucial role in determining the shortest path by considering the cost (distance) between routers.
• 😀 The process starts with an initial routing table that lists available routers, their respective distances, and the next hop.
• 😀 Each router exchanges distance vectors with its immediate neighbors to share information about the network's topology.
• 😀 The goal of DVR is for routers to update their routing tables iteratively based on the distance vectors received from their neighbors.
• 😀 The algorithm ensures that the packet reaches its destination through the shortest path possible, even if the destination is several hops away.
• 😀 The next hop is updated as the routers receive distance vectors, allowing them to select the most efficient path to forward packets.
• 😀 A router's routing table is updated based on new distance information, and the routing decisions are re-evaluated at each iteration until optimal paths are found.
• 😀 The update process continues until the shortest possible path is established between the source and destination routers.
• 😀 The final routing table reflects the shortest paths for each destination based on the information shared by all participating routers.

Q & A

What is the primary focus of the video script?

The primary focus of the video script is to explain the concept of Distance Vector Routing (DVR) in networking, emphasizing how routers use distance vectors to find the shortest path to reach a destination.

What role does the distance factor play in Distance Vector Routing (DVR)?

The distance factor is crucial in DVR as it determines the cost or distance between routers. It helps each router decide the shortest path to a destination by considering the cost to reach that destination from neighboring routers.

What are the key components of a routing table in DVR?

A routing table in DVR consists of three key components: the destination router, the cost (distance) to that destination, and the next hop (the next router to forward the packet to).

How is the distance calculated in DVR?

The distance in DVR is calculated by considering the cost from the source router to the destination router, factoring in the distances to intermediate routers (neighbors), which are shared via distance vectors.

What is a 'local routing table' in the context of DVR?

A 'local routing table' refers to the initial table created at a router, containing information about the router's neighbors, the cost to reach them, and the next hop. This table is updated as the router receives distance vectors from its neighbors.

How does a router update its routing table in DVR?

A router updates its routing table by receiving distance vectors from neighboring routers. It then compares the cost to reach a destination via its own path and the received vectors. If a shorter path is found, the table is updated.

What does the term 'next hop' mean in a routing table?

The 'next hop' in a routing table refers to the immediate router that a packet should be forwarded to, in order to reach the destination. It is determined based on the shortest path from the source router.

What happens when a router receives an updated distance vector in DVR?

When a router receives an updated distance vector, it recalculates the cost to reach each destination by considering the new distance data. If any shorter paths are found, the routing table is updated to reflect the new paths.

Why is the process of updating routing tables in DVR repeated?

The process of updating routing tables in DVR is repeated to ensure that all routers have accurate and up-to-date information about the shortest paths to all destinations in the network. This iterative process continues until no further changes are needed.

How does the DVR algorithm ensure that the shortest path is selected?

The DVR algorithm ensures the shortest path by continually exchanging distance vectors between routers. Each router updates its routing table based on the shortest distances provided by its neighbors. Over time, all routers converge on the optimal routing paths.