Protocol Attacks exploit a specific feature or implementation bug of some protocol installed at the victim in order to consume excess amounts of its resources. This type of attack consumes actual server resources, or those of intermediate communication equipment, such as firewalls and load balancers, and is measured in packets per second (pps). Common protocol attacks include smurf attack, SYN attack, UDP attack, ICMP attack, CGI request attack, authentication server attack, attack using DNS systems, and attack using spoofed address in ping.