C-NNIC study guide
C-NNIC · Work through your exam, one topic at a time.
The Certified Network Infrastructure and Cabling credential, commonly shortened to C-NNIC, is an independent certification aimed at professionals who build and maintain the physical layer of enterprise networks: cabling installers, infrastructure technicians, field engineers, and the planners who design pathways, spaces, and racks. It tests whether a candidate can reason across the whole physical plant rather than recite a single vendor's product line, covering structured cabling topology and wiring, infrastructure design, media and physical-layer standards, installation practice and cable management, testing and troubleshooting, codes and safety, plus racks, power, and cooling. The C-NNIC study guide has 7 sections and about 2,006 words.
01Network Cabling Systems and Structured Wiring
Structured wiring organizes every cable into a predictable hierarchy: work area, horizontal cabling, telecommunications room, backbone cabling, and entrance facility. The work area covers patch cords from device to outlet; the permanent link begins at the outlet and ends at the patch panel.
319 words, about 2 min02Network Infrastructure Design and Topologies
Design questions test whether you can translate requirements into a physical topology. Start with the logical models: star, hierarchical three-tier (core, distribution, access), collapsed core, spine-leaf for data centers, and ring for resilience.
311 words, about 2 min03Physical Layer Standards and Media Types
This domain covers the electrical and optical rules behind the cable. For twisted-pair, know the parameters that determine performance: insertion loss, return loss, near-end crosstalk, far-end crosstalk, attenuation-to-crosstalk ratio, propagation delay, delay skew, and alien crosstalk for 10GBASE-T over Category 6A.
284 words, about 1 min04Installation Practices, Pathways, and Cable Management
Installation questions reward procedural discipline. Know pathway types: conduit, cable tray, J-hooks, raceway, and underfloor or ceiling plenums, and the fire-rated and plenum-rated requirements that follow.
281 words, about 1 min05Testing, Certification, and Troubleshooting of Cabling
Certification proves a link meets a standard; troubleshooting finds why it does not. Know the tester types: continuity and wire-map testers, qualification testers, and certification testers that report per-parameter pass or fail with margin.
280 words, about 1 min06Codes, Standards, and Safety Compliance
Compliance questions test whether you know which document governs what. Electrical codes address installation safety, grounding, and fire ratings; cabling standards address performance and administration; local codes and authority having jurisdiction can override.
265 words, about 1 min07Network Hardware, Racks, and Power/Cooling
Physical hardware questions cover racks and cabinets, RU sizing, rail and mounting standards, airflow direction, and cable management within the enclosure. Know the difference between two-post and four-post racks, cabinet depth, and why front-to-back airflow must match switch port orientation.
266 words, about 1 min