Answer:
Botnet is typically operate by the internet relay networking and domain. The botnet are generally received specific type of the instruction from the control server.
The main purpose and structure of botnet is basically depend upon the various type of instruction and structure.
The botnet is communicated with the help of IRC ( Internet relay chat) and it is basically communicated with the chat server for transferring the data to the client. The IRC network basically use simple network with low bandwidth for communication with the host of the botnet.