A Layer 7 DDoS attack is another name for the type of application layer included among distributed denial-of-service attack formats. Layer 7 is named after the Open Systems Interconnection (OSI) internet model, which divides the functions of a network system into seven isolated layers. In these attacks, botnets send vast amounts of inquiries to one of the application functions of the targeted system. In one Layer 7 attack experienced by a Google customer on June 1, it was found that 46 million inquiries had been sent within a single second.