|  |  | There are several different types of DoS attacks. Attacks can be against network bandwidth, processor cycles, disk space, or even a single port on a system. The system may operate normally with the exception of the service under attack. Some attacks can make your Web page unable to accept any connections; however, the page may otherwise function properly. Other attacks are for the sole purpose of causing your system to reboot. Sometimes a reboot is necessary to activate harmful software that a hacker has installed on your system; other times, reboots are done simply out of malice.