Routing
Routing is the process of forwarding of a packet in a network so that it reaches its planned destination. The key goals of routing are:
1. Correctness: The routing ought to be done properly and correctly so that the packets could reach their proper destination.
2. Simplicity: The routing should be done in a easy manner so that the overhead is as low as possible. With rising complexity of the routing algorithms the overhead also increases.
3. Robustness: Once a key network becomes operative, it possibly will be expected to run continuously for years without any failures. Here The algorithms designed for routing should be robust enough to handle hardware and software failures and should be able to cope with changes in the topology and traffic without requiring all jobs in all hosts to be aborted and the network rebooted every time some router goes down.
4. Stability: The routing algorithms should be stable under all possible circumstances.
5. Fairness: Every node connected to the network should get a fair chance of transmitting their packets. This is generally done on a first come first serve basis.
6. Optimality: The routing algorithms should be optimal in terms of throughput and minimizing mean packet delays. Here there is a trade-off and one has to choose depending on his suitability.
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