Explanation: Website defacing is an attack on a website by unauthorized party that changes the visual appearance of the site or a webpage. These are typically the work of system crackers, who break into a web server and replace the hosted website with one of their own.
Incorrect Answers:
A: Ping Flooding is the extreme of sending thousands or millions of pings per second. Ping Flooding attack can make system slow or even shut down an entire site.
C: A denial-of-service attack (DoS attack) is an attempt to make a computer or network resource unavailable to its intended users. One common method of attack involves saturating the target machine with external communications requests, such that it cannot respond to legitimate traffic, or responds so slowly as to be rendered effectively unavailable.
D: The FTP bounce attack is attack which slips past application-based firewalls. In this hacker uploads a file to the FTP server and then requests this file be sent to an internal server. This file may contain malicious software or a simple script that occupies the internal server and uses up all the memory and CPU resources.