Broadband access is fast . A dial-up user may notice slower performance during a hacker attack. Most users will consider this a poor telephone connection, log out and reconnect-effectively ending the attack. Users with broadband connections will not likely notice performance slowdown or any effects of a hacker attack until it is too late. The security of any given system depends on the quality of implementation.
Hackers often use a port scan approach to find security holes.
Other ports may be used for other Internet applications. Port scan hacker attacks look for applications with weak security systems and, once found, use those communications channels to invade other parts of the hacked computer. While attacking, hackers try to hide their identities by using a scheme called IP Spoofing. Normally, data packets contain source and destination addresses. Because hacking can carry criminal penalties, the hacker provides an incorrect source address in the data packet so that the source of attack cannot be traced easily.