difference between 2.1 and 3.1 certification

difference between 2.1 and 3.1 certification. There are some references to difference between 2.1 and 3.1 certification in this article. If you are looking for difference between 2.1 and 3.1 certification you've came to the right place. We have images about difference between 2.1 and 3.1 certification. You can check it out below.