One day, the high-school teacher informed me that the computer system was running slower than normal. I asked the teacher when was the last time that the system has been rebooted. The teacher indicated that the system had been up for at least 5 weeks. It is important to note that a server should be rebooted on a periodic basis, since lost running programs (referred to as the computer system's performance may be affected by "'''zombie processes'''"(programs was completed, but still is considered a process with ID ) by occur, or "'''memory leaks'''" (due to poor programming) may affect the computer server's performance. I instructed that the instructor reboot the server once or twice a week, and that solved the problem.