Without the security measures and controls,
our data might be subjected to an attack. The DDoS
attack is an attempt of attacking in a distributed fashion
to make a server and its resources unavailable to its
authorized users. The DDoS attack is a malicious
attempt to disrupt access to the server by means of
creating a large amount of traffic. In this paper, we
propose types of DDoS attacks, analysis of different
attacks so far, protection techniques and mitigation
techniques, and possible limitations and challenges of
existing research to reduce network overhead. Finally,
some important research directions are given which
require more attention shortly to ensure successful
mitigation against distributed denial-of-service attacks.
Keywords : Types of DDoS Attack, Distributed Denial-of- Service Protection, Distributed Denial-of-Service Mitigation Technique.