In this attack, multiple source hosts send SYN packets to a destination host. After receiving the SYN ACK packets from the destination host,the source hosts do not respond. In this case, the destination host establishes many connection queues for the source hosts and maintains the queues all the time because no ACK response is received. As a result, many resources are used and the destination host cannot provide normal services for normal connections.

In this attack, a large number of ICMP Echo packets are flooded to a destination host within a short time, causing network congestion or resource depletion.

In this attack, a large number of ICMP Redirect packets are flooded to a destination host within a short time, causing network congestion or resource depletion.

In this attack, a stream of TCP SYN packets have the source IP address and TCP port number set to the same value as the destination address and port number.Some implementations of TCP/IP cannot handle this theoretically impossible condition, causing the operating system to go into a loop as it tries to resolve repeated connections to itself.

In this attack, a perpetrator sends a large amount of ICMP echo request (ping) traffic to IP broadcast addresses, all of which have a spoofed source IP address of the intended victim making computers in the same network reply to the requests, flooding the victim machine with ICMP echo replies.

In this attack, WinNuke Attack affects the Microsoft Windows 95, Microsoft Windows NT and Microsoft Windows 3.1x computer operating systems. The exploit sent a string of OOB (out of band) data to the target computer on TCP port 139、138、137 or 113 (NetBIOS), causing it to lock up and display a Blue Screen of Death. This did not damage or change the data on the computer's hard disk, but any unsaved data would be lost.