CompTIA / Foundational / N10-009
Network+
Build a packet-by-packet mental model of addressing, switching, routing, wireless access and network troubleshooting.
THE REVISION PATH
Your topics, in order.
Read. Recall. Explain the alternative.
Models, Packets and Network Devices
Name the layer, then name the job.
IPv4, IPv6 and Subnetting
Prefix is the boundary; longest match wins.
Ports, DNS, DHCP and Time
Resolve the name, obtain the lease, trust the clock.
Switching, VLANs and Loop Prevention
VLAN separates; trunk carries; spanning tree prevents loops.
Routing, NAT and Resilient Gateways
Specific route first; preference next; metric within the protocol.
Wireless and Network Access Security
Signal quality, channel plan and identity all matter.
Cabling, Cloud and Physical Design
Match medium, distance, power and failure domain.
Network Operations and Recovery
Baseline normal; control change; restore what matters.
Troubleshooting Networks
Define the symptom; test one layer; verify the whole path.
How this guide is organised
Original revision notes arranged around practical decisions. The linked official objectives define the mapped scope; primary documentation supports the explanations. Read each topic, answer without looking, then explain why another option would fail.
- Official exam guide ↗ Scope authority
- CompTIA CertMaster learning ↗ Vendor learning reference
Revision material supports preparation; it does not guarantee every possible exam question. Check the exam version and official objectives before booking.