![]() OurĪlgorithm will update these values until they represent the smallest We will make use of a distances dictionary which we will initialize toĠ for the start vertex, and infinity for the other vertices. To keep track of the total cost from the start node to each destination Starting node to all other nodes in the graph. The algorithm we are going to use to determine the shortest path isĬalled “Dijkstra’s algorithm.” Dijkstra’s algorithm is an iterativeĪlgorithm that provides us with the shortest path from one particular Weights are equal, the problem is the same. That here we are concerned with the total weight of the path rather than Is similar to the problem we solved using a breadth first search, except This problem should sound familiar because it ![]() ![]() Solve is to find the path with the smallest total weight along which to Interconnection of routers in the Internet. It will not surprise you to learn that we can represent the network ofĬonnections and weights between routers in theĪbove we show a small example of a weighted graph that represents the Volume of traffic, the time of day, and many other factors. With each connection between a pair of routers that depends on the This is because there is a cost associated You are likely to see that your information flows through different So if you run the traceroute command at different times of the day, Which illustrates that there are 12 routers between him and the Google Output of running traceroute on the author’s computer, You can see there are many routers for yourself if yourĬomputer supports the traceroute command. Of these routers is to work together to get your information from place Labeled “Internet” in the diagram are additional routers. The web page you requested then travelsīack through the same routers to get to your browser. Internet and eventually arrives at a router for the local area network When you use your browser to request a web pageįrom a server, the request must travel over your local area network and The diagram above shows you a high-level overview of how communication Just enough to understand another very important graph algorithm. ![]() However, we will talk about how the Internet works To another over the Internet is the primary topic for a class inĬomputer networking. The in-depth study of how information flows from one computer Scenes to get the information on your computer transferred to anotherĬomputer. When you surf the web, send an email, or log in to a laboratory computerįrom another location on campus a lot of work is going on behind the
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