Class 8, Botnets & zombie networks.

Botnet is a set of program communicating with other programs to perform task. Botnet is from the word robot and network. this word has a negative connotation to it. There are legal botnets and illegal botnets. Legal botnet is used to keep IRC channels free from other unwanted users. Illegal botnet is making other computers controlled by third party. Botnet operater sends out viruses. 

A zombie process is a process of completing executing but have an entry to a process table. Let's understand it! Usually the process by calling the exit system function, the process is going to end. And thereby their release all resources. However, the state and the PID of the process to be exit status is still maintained to stay (in the task struct in the kernel). There are several reasons for doing this, doing this is because the parent can check the information on to be able to get the exit status of the child that their child finished in any state. If the process is to remove the process: if the information in the task struct zoom back immediately from the kernel all the resources and at the same time calling the exit, the parent process will become quite know if their child process exits in any state.

There are two reason why botnet is produced.  One is economic profit motive and another motivation is just for fun. Operators who wish to advertise for marketing is the biggest supporter of botnets by paying a fee to the distributor of spam or adware. As far as the operating system of most PC in one of the largest security companies in the United States simaen Tech Corp. announced last year that make up the botnet is referred to as Windows 2000. The market penetration of the Windows operating system is proprietary count that is the root cause to bring the rapid expansion of botnets. Threats to security is a crucial reason for another regulatory policy. Even after all is only a cyber criminal activity that growing up in a botnet of poisonous environment provided by the monopoly of certain companies with profit motives.