When you have a simple network topology with just one router, routing traffic around that network is simple. As the router knows exactly where each device is, it can forward data to the right destination without difficulties. Again, the routing is relatively simple in a slightly more complex network with two routers. If the router knows that the destination address is directly connected, it can send the traffic. It must be connected to the other router if it’s not directly connected. Once you have more than two routers in a network, things become more complicated. This is especially the case when there is also access to the Internet. Let’s say we have three routers: A, B, and C, and that they’re connected in a line. While A and C know they can forward any traffic intended for an unknown destination to B, B faces the dilemma of not knowing which way to send traffic. If you add an internet connection to both A and C. None of the routers can know where to send any traffi...
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