Example 1 of the course discussion question: In real life, if a physical transmission channel is established between any two users, the communication problem between us can be solved. Assuming there are N users, a total of N×(N-1)≈N2 physical transmission channels are required. Disadvantages: expensive, extremely difficult to expand, and the utilization rate of each physical transmission channel is extremely low. The basic problem of the communication network is how to effectively solve the problem of instant information transmission between any two users in any geographical location at the lowest possible cost. It is completely similar to the current transportation system to solve the problem of the flow of people and materials.
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