Denial
Of Service Attack
Its
Real, On February 6th, 2000 Yahoo portal was shut down for 3 hours. Then
retailer Buy.com Inc. (BUYX) was hit the next day, hours after going public. By
that evening, eBay (EBAY), Amazon.com (AMZN), and CNN (TWX) had gone dark. And
in the morning, the mayhem continued with online broker E*Trade (EGRP) and
others having traffic to their sites virtually choked off.
What is a
Denial Of Service Attack ?
- A denial of service attack
(DOS) is an attack through which a person can render a system unusable or
significantly slow down the system for legitimate users by overloading the
resources, so that no one can access it.
- If an attacker is unable to
gain access to a machine, the attacker most probably will just crash the
machine to accomplish a denial of service attack.
Types of denial of service attacks
There are several general categories
of DoS attacks . Popularly, the attacks are divided into three classes:
- bandwidth attacks,
- protocol attacks, and
- logic attacks
What
is Distributed Denial of Service Attack?
- An attacker launches the attack
using several machines. In this case, an attacker breaks into several
machines, or coordinates with several zombies to launch an attack against
a target or network at the same time.
- This makes it difficult to
detect because attacks originate from several IP addresses.
- If a single IP address is
attacking a company, it can block that address at its firewall. If it is
30000 this is extremely difficult
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