Qualifications improve your chances; they do not gate the job. Level 3 is the most recognised.
Level 3 most recognisedOpen entry
Your route in
You can start without qualifications - direct entry/volunteering; a qualification improves your chances
1
Qualifications employers recognise (Level 3)
Any of these strengthens your application.
2
Where this can take you
Can enter with no formal qualifications via IT support and train on the job; recognised routes are the Level 3 ICT technician apprenticeship rising to Level 4 network engineer plus vendor certs (CompTIA, Cisco).