Which two engineering organizations define open standards and protocols that apply to the data link layer?

The two engineering organizations that define open standards and protocols that apply to the data link layer are the International Organization for Standardization (ISO) and the International Telecommunication Union (ITU).

Explanation:

The organizations that are authorized by the United States government to define certain standards and protocols also act as the supervising agencies over the other organizations that use the standards and protocols in their own functioning and the operations carried out by them. The standards and protocols associated with the data link layer do the job of protecting the data and dispensing the required security to the information exchanged online.