Date Added: Jan 2013
Computer network is collection of computers and other hardware components interconnected by communication channels that allow sharing of information. Network security consists of the provisions and policies adopted by a network administrator to prevent and monitor unauthorized access, misuse, modification, or denial of a computer network and network-accessible re-sources. Network security involves the authorization of access to data in a network, which is controlled by the network administrator. Distributed Denial-of-Service attack (DDoS attack) is an attempt to make a machine or network resource unavailable to its intended users. The previous work, one is acknowledgment-based and the other one depends on synchronized clocks.