Networking on Windows 11

Networking Fundamentals already covers the underlying concepts — IP addressing, DNS, ports, the whole stack — in real depth, independent of any one operating system. This chapter is the Windows-specific half: how those concepts surface in Windows 11's own settings, and the handful of Windows-only behaviors (network profiles chief among them) that don't exist in the general model at all.

Network Profiles — Public vs. Private

Every network Windows connects to is assigned a profile — Private (a trusted home or work network) or Public (an untrusted network, like a coffee shop or airport). The profile isn't cosmetic labeling; it changes real, active behavior:

This is enforced by Windows Firewall maintaining genuinely separate rule sets per profile — a rule enabled for Private doesn't apply while connected to a network currently classified as Public, and vice versa, without needing to be manually toggled each time.

Wi-Fi & Ethernet Setup

Wi-Fi connects through the taskbar's quick-settings panel or Settings > Network & internet > Wi-Fi, with saved networks reconnecting automatically by signal strength and priority. A Wi-Fi connection can also be marked metered — signaling to Windows that data usage should be minimized, which, notably, can pause or defer large background downloads including Windows Update itself (covered fully in Chapter 8). Ethernet, by contrast, is normally zero-configuration — DHCP hands out an IP address, gateway, and DNS servers automatically the moment a cable is plugged in.

Manually configuring a static IP, gateway, or DNS server still opens the classic adapter properties dialog — the exact "partially migrated" case Chapter 5's own table already named: Settings shows a basic view, but this deeper configuration remains Control Panel territory underneath.

DNS on Windows — the Practical Side

Networking Fundamentals 9 already covers what DNS actually is and how resolution works, in full. On a Windows machine specifically, DNS servers are set per-adapter (inherited from DHCP by default, or overridden manually in the same adapter properties dialog above), and a local DNS cache is maintained to avoid re-querying for names already resolved recently — the exact cache Windows 11 Troubleshooting & Administration's own networking chapter clears with ipconfig /flushdns when a stale entry is the actual problem.

Sharing — Network Discovery & File Sharing

The classic Network and Sharing Center Control Panel item remains fully alive and is still where several sharing-related toggles genuinely live, alongside their Settings-app counterparts. Windows's old "Homegroup" feature was removed entirely in favor of simpler folder- and printer-level sharing, controlled per-object through each item's own Properties > Sharing tab, gated by whichever network profile — Private or Public — is currently active.

Windows Firewall Basics

Windows Firewall filters both inbound connections (something outside trying to reach this PC) and outbound connections (this PC trying to reach something outside), with separate rule sets for the Domain, Private, and Public profiles. Most day-to-day use never requires touching a firewall rule directly — installed apps typically register their own rules automatically — but the Windows Security app (covered in full in Chapter 9) is the modern entry point when a rule genuinely does need reviewing or adding.

Hands-On Exercises