CompTIA Network+ Study Guide

255 High-Yield Concepts for the CompTIA Network+ (N10-009) Exam

A focused, high-yield concept review for the CompTIA Network+ (N10-009) exam — 255 high-yield concepts, each with key facts, a strategy tip, and a worked example, organized across the five official domains in exam-weight order: Part 1 — Network Troubleshooting (52 concepts, 24%): troubleshooting methodology, cabling and interface issues, services and addressing issues, performance issues, and network tools (protocol analyzers, CLI, cable testers, Wi-Fi analyzers). Part 2 — Networking Concepts (58 concepts, 23%): the OSI model, network appliances, ports and protocols, IPv4/IPv6 addressing and subnetting (VLSM, CIDR, APIPA, RFC1918), topologies, transmission media, transceivers and connectors, and cloud concepts (NFV, VPC, security groups). Part 3 — Network Implementation (51 concepts, 20%): static and dynamic routing (BGP, EIGRP, OSPF), NAT/PAT, FHRP and VIPs, VLANs and spanning tree, MTU and jumbo frames, PoE, wireless standards and security, and physical installations. Part 4 — Network Operations (49 concepts, 19%): documentation, device life-cycle (EOL/EOS), change and configuration management, monitoring (SNMP, NetFlow, packet capture, port mirroring), disaster recovery (RPO, RTO, cold/warm/hot sites), network services (DHCP, SLAAC, DNS, NTP), remote access, and management. Part 5 — Network Security (45 concepts, 14%): encryption and PKI, IAM and MFA, RADIUS/LDAP/SAML/TACACS+, RBAC, geofencing, physical security, segmentation (IoT/OT/SCADA/ICS), honeypots, attack types (DoS/DDoS, VLAN hopping, MAC flooding, ARP/DNS poisoning, evil twin, on-path), defense-in-depth hardening, NAC, and compliance (PCI DSS, GDPR). Includes a verified exam snapshot (N10-009: up to 90 multiple-choice and performance-based questions, 90 minutes, 720 passing score on a 100–900 scale, domain weights 23/20/19/14/24 percent, launched June 20 2024, recommended experience of A+ plus 9–12 months in a junior network admin or support role) sourced from comptia.org on 2026-09-19, plus a 30-day study plan and test-day strategy. Independent companion — not affiliated with, endorsed by, or sponsored by CompTIA. “CompTIA” and “Network+” are registered trademarks of CompTIA, Inc. This guide reproduces no CompTIA exam questions or copyrighted exam content. Exam details, objectives, and policies change — confirm the current exam version, objectives, format, and fees at comptia.org before registering.