First the client sends a SYN packet to the server. The SYN attack involves the three-way handshake of the TCP/IP protocol. The consequences may be anything from reboots to system hangs. When reassembled the packet proves to be too large for the buffers and overflows it. A Ping of Death attack involves a very large Internet Control Messaging Protocol (ICMP) packet and the receiving computer gets it in the form of data packets, Then it tries to reassemble it. The types of DOS attacks are Ping of Death and SYN attacks. DOS attacks are commonly launched from one or more points on the Internet that are external to the victim's own system or network. Denial-of-service attack A denial-of-service attack (DOS attack) is an attempt to make a computer resource unavailable to its intended users.
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