I am reading Kurose Computer Networking book 8e, on page number 57, under 1.3.2 Circuit Switching
Because it link has $4$ circuits, for each link used by the end-to-end connection, the connection gets $\frac{1}{4}$ of the link's total transmission capacity for the duration of connection.
![](https://i.imgur.com/Fc4pVU8.jpeg)
In the context of circuit switching, each link will be reserved for the network session along with transmission rate but the system allows multiple new connections to establish. For example, even a telephone call is going on, you can still call another person from different phone number $$A \to B$$ $$C \to D$$
Series of questions
- Why does the transmission rate in the reserved link gets divided when more concurrent connections are established?
- Why does adding more will interfere to that particular link?
- In the above example let's say if there is a new host establishes from the bottom left side, and it establishes some another link, why does the it will drop the bandwidth of already established link to $\frac{1}{4}$? Also shouldn't it be $\frac{1}{n}$ where $n$ is number of active links?
- How does the concept of "guaranteed bandwidth" differ from the actual bandwidth used by a single connection?
- How does reserving bandwidth in circuit switching affect the network's scalability compared to packet switching, where bandwidth is shared dynamically?