Denial of Service (DoS) and distributed Denial of Service (DDoS) attacks involve an attempt to make a computer resource unavailable to its intended users. This may simply be for malicious purposes as is often the case when big commercial or famous web sites undergo a DDoS attack. However, it is also possible to exploit the system’s response to such an attack to break system firewalls, access virtual private networks, and to access other private resources. A DoS attack can also be used to affect a complete network or even a whole section of the Internet.
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