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Explain distance vector routing . What are its limitations and how are they overcome?
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Answer Posted / sanjaypoudel135@gmail.com
Distance Vector Routing Definition. Distance vector routing is a simple routing protocol used in packet-switched networks that utilizes distance to decide the best packet forwarding path. ... A hop is the trip that a packet takes from one router to another as it traverses a network on the way to its destination.
it is a dynamic vector routing algorithm.
consists of data structure called routing table.
it calculates the best route based on the distance.
distance vector routing updates full routing table.
it is simple to implement and manage.
Bellman ford algorithm is used for performing distance vector routing.
The utilization of CPU and memory in distance vector routing is lower than the link state routing.
Limitations
It is slower to converge than link state.
bellman ford algorithm does not prevent routing loops from happening and suffers from the count-to identify problem
Limitations overcome
In such such a scenario 3 hop-counts path will be selected although other path is congestion free. This can be overcome by using LSA
(Link State Analysis) protocols and Hybrid Protocols. In these not only the hop-count is considered but also link quality is checked at regular interval to ensure the selection of not only shortest path but also the most efficient path for the destination
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