A user reports being unable to access network resources after making some changes in the office. Which of the following should a network technician do FIRST?

A user reports being unable to access network resources after making some changes in the office. Which of the following should a network technician do FIRST?

A. Check the system's IP address B. Do a ping test against the servers C. Reseat the cables into the back of the PC D. Ask what changes were made