Network engineer postings are among the most keyword-precise in IT. They list protocols (BGP, OSPF, VLANs, STP), vendors and product lines (Cisco, Juniper, Arista, Palo Alto, Fortinet), and certifications (CCNA, CCNP) that recruiters filter on directly. An applicant tracking system will not equate "routing experience" with "BGP", so use the exact protocol and vendor names you worked with. The groups below cover routing and switching, security, wireless and WAN, cloud networking and tools, with notes on how to show scale and design work.
Most mid-size and large employers in the US and Canada receive applications through an applicant tracking system such as Workday, Greenhouse, Lever, iCIMS or Taleo. The system parses your resume into fields (titles, dates, skills) and lets recruiters search and rank candidates by the terms in the job description. Some systems only match exact words; others recognize close variants. Either way, the safest approach is to use the same wording as the posting for every skill you genuinely have — inside a bullet that explains what you did with it.