* The question asks about the next step to perform network troubleshooting after identifying an issue, which is the first step in the CompTIA Network+ troubleshooting methodology12.
* The second step is to establish a theory of probable cause, which involves analyzing the symptoms, researching the knowledge base, and identifying the most likely reasons for the issue12.
* The other options are not the correct next step, as they occur later in the troubleshooting process:
* Implementing a solution is the fourth step, after testing the theory and determining the next steps12.
* Escalating the issue is a possible action in the third step, if the theory is not confirmed or the problem is beyond the scope of authority or ability12.
* Documenting the findings is the final step, after verifying the functionality and implementing preventive measures12. References:
* CompTIA Network+ N10-008 Study Guide, Chapter 1, Section 1.7, Troubleshooting Methodology, page 351
* Professor Messer's CompTIA N10-008 Network+ Course Notes, Section 1.7, Troubleshooting Methodology, page 72