CompTIA Network+ (N10-009) Domain 3: Network Operations

Domain 3 — Network Operations (Overview)This domain is all about keeping production networks healthy, observable, and auditable. Across six 90-question, scenario-driven exams you’ll practice NOC workflows, monitoring/telemetry, baselining, documentation, change and config management, DR/BC runbooks, QoS/capacity operations, and the very real “rack-and-room” concerns (power, cooling, labeling, OOB, safety). Expect ticket narratives, dashboards, logs, and MOPs/SOPs—plus “prove it works” validation steps.Short descriptions (D3 exam bank titles)D3-A • Monitoring & Telemetry OperationsOperate with SNMPv3, NetFlow/sFlow/IPFIX, syslog→SIEM, traps, thresholding, dashboards, and alert tuning. Correlate KPIs/SLIs with incidents, noise-reduce, and build actionable runbooks.D3-B • Documentation, Diagrams & BaselinesCreate/maintain L1–L3 topologies, rack/patch panels, inventory and IPAM records, golden configs, and performance baselines. Use labeling standards and diagram conventions to accelerate troubleshooting.D3-C • Change, Config & Patch ManagementPlan and execute changes via CAB/ITIL, MOP/SOP, maintenance windows, and back-out. Version control/golden images, compliance drift checks, configuration backups/restore, and automated templating.D3-D • Incident Response, DR & Business ContinuityFollow IR playbooks (triage, containment, eradication, recovery), coordinate comms/RCAs, and design/test BCP/DRP (RTO/RPO). Backups, replicas, failover exercises, tabletop validation.D3-E • Performance, QoS & Capacity OperationsBaseline and trend utilization; tune QoS (classification/marking, LLQ, shaping/policing), WAN optimization touchpoints, SLA monitoring, and capacity planning with forecasting and threshold strategy.D3-F • Physical, Environmental & OOB OperationsSafely run the room: power (UPS/PDU), cooling/HV