Internet Protocol Stack (IMAGE) Georgia Institute of Technology Caption This illustration of the hourglass Internet architecture shows the six layers, from top to bottom: specific applications, application protocols, transport protocols, network protocols, data-link protocols and physical layer protocols. Credit (Credit: Constantine Dovrolis) Usage Restrictions None License Licensed content Disclaimer: AAAS and EurekAlert! are not responsible for the accuracy of news releases posted to EurekAlert! by contributing institutions or for the use of any information through the EurekAlert system.