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Certifications that open doors
CCNA (Cisco Certified Network Associate)
A widely recognized networking credential.
Cloud certifications
Amazon Web Services and Microsoft Azure. Networks now reach into the cloud, and employers want people who understand both sides.
Security+ or the CISSP (Certified Information Systems Security Professional)
The CISSP needs five years of experience before you can hold it.
CCNP (Cisco Certified Network Professional)
The next rung up, for people who want to stay technical instead of managing.