EvoArch Plot (IMAGE) Georgia Institute of Technology Caption Illustration showing the number and age of protocols in each layer of the Internet architecture. In the middle layers, there are only a few protocols that are old and conserved. 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.