Networking
Reference material for network services, TCP/IP addressing, wireless connectivity, cabling, and field diagnostic tools.
Network troubleshooting starts by separating the physical link, IP configuration, name resolution, application service, and wireless radio paths.
| Topic |
Use it for |
| Network ports, protocols, and services |
Common service roles and ports |
| TCP/IP addressing and SOHO networks |
Gateways, DHCP, DNS, NAT, and router functions |
| Wireless and SOHO connectivity |
Wi-Fi security, bands, placement, and local fault isolation |
| Network tools and cabling |
Cable testing, tracing, termination, interface testing, and wireless analysis |
Diagnostic sequence
- Establish whether the physical or radio link exists.
- Check local addressing and the default gateway.
- Test name resolution and then the application service.
- Select a tool that proves the remaining fault path.
In this section
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Network Ports, Protocols, and Services
How common network services use ports and protocols for web access, name resolution, addressing, remote access, mail, and directory lookup.
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TCP/IP Addressing and SOHO Networks
How IPv4 addressing, gateways, DNS, DHCP, NAT, and a small-office router work together on a local network.
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Wireless and SOHO Connectivity
How Wi-Fi bands, access-point placement, wireless security, guest access, and small-office router settings affect local connectivity.
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Network Tools and Cabling
How cable, interface, and wireless diagnostic tools provide evidence for physical and local-network faults.
Revised on Friday, September 11, 2026