Once the communication is interrupted, the computer is out of the reach of the botnet. Many times, something goes wrong with an important computer that is part of the botnet, and the botmaster risks losing the entire structure for a single station. That is why botmasters have been intensely researched on different network architectures to protect their network even when a significant part of it has been taken offline.
Image 1: a centralized Command and Control architecture. Each compromised machine reports to a C&C server that is controlled by the botmaster. Once a C&C server is shut down, its bots are lost forever
Attackers can control their botnets in a centralized manner, using peer-to