Explanation: In the context of network communication, the type of network determines how data is transmitted between machines. There are several types of networks, each with its own method of data transmission:
1. **Unicast Network**: In a unicast network, data is sent from one machine to another specific machine. This is a point-to-point communication where the sender and receiver are explicitly identified. The communication channel is not shared by all machines, but rather the data is directed to a single recipient. This type of network is used when a specific machine needs to receive the data.
2. **Multicast Network**: In a multicast network, data is sent to a group of machines. This is a point-to-multipoint communication where the sender sends data to a predefined group of recipients. The data is not sent to all machines on the network, but only to the machines that are part of the multicast group. This is useful for applications like video conferencing or live streaming, where the same data needs to be sent to multiple recipients simultaneously.
3. **Broadcast Network**: In a broadcast network, the communication channel is shared by all the machines on the network. Any data sent by one machine is received by all other machines on the network. This is a point-to-all communication where the data is sent to every machine on the network. This type of network is used when the data needs to be received by all machines on the network, such as in a local area network (LAN) where a machine might need to send a message to all other machines.
4. **Anycast Network**: In an anycast network, data is sent to the nearest machine in a group of machines. This is a point-to-nearest communication where the sender sends data to the closest recipient in a group. This type of network is used to optimize data transmission by sending data to the nearest available machine, which can reduce latency and improve performance.
The question specifically asks about a network where the communication channel is shared by all the machines on the network. This description matches the characteristics of a broadcast network, where any data sent by one machine is received by all other machines on the network. Therefore, the correct answer is (C) Broadcast network.