Generally, we have levels of technical expertise based on how many years of schooling you did.
- Technician: 2 years of college (diploma)
- Technologist: 3 years of college (advanced diploma)
- Engineer: 4 years of university (bachelor's degree) plus 5 years of training as an Engineer-in-Training (EIT) and a successful attempt at the Professional Engineer (PEng) exam
Of these, only "engineer" is a protected title in Ontario. But you can get additional certification through OACETT to become a Certified Technician (CTech) or Certified Technologist (CT).
So, depending on the person's education and training, they could be called a Network Technician, Network Technologist, or Network Engineer.