Exercise 1: A PC Is Invisible on Its Own Home Network — Possible Solution ==================================================================== THE MOST LIKELY CAUSE ------------------------------ Per this chapter's own compare-table, "Network discovery" is "Off - this PC stays invisible to other devices" under the Public profile, while it's "On - other devices on the network can see this PC" under Private. The most likely cause is that this Wi-Fi network is currently classified as Public on the PC that isn't showing up, even though it's genuinely a trusted home network. WHY THIS PRODUCES NO ERROR MESSAGE ------------------------------ Per this chapter's own warn-box, "selecting Public on a genuinely trusted home network... doesn't produce an error - it silently applies the wrong rule set." Network discovery being off isn't a malfunction Windows reports - it's the profile working exactly as designed for an untrusted network, just applied to a network that doesn't actually deserve that level of caution. Nothing on screen distinguishes "working correctly as Public" from "misconfigured and should be Private." WHY THIS CHAPTER SPECIFICALLY POINTS AT PROFILE SELECTION ------------------------------ Per this chapter's own warn-box, exactly this symptom is called out by name: "a user who can't find a shared printer, or can't see another PC on their own home network, has very often connected under the Public profile rather than Private." This isn't a hypothetical edge case - it's the specific, named example this chapter uses to illustrate the consequence of the wrong profile. WHERE TO CHECK IT ------------------------------ Per this chapter's own tip-box, Settings > Network & internet > [the active connection] shows "Network profile type" directly, with a toggle right there to switch between Public and Private - checking and correcting that setting is the direct fix, rather than troubleshooting sharing settings or firewall rules first. WHY THIS WORKS AS AN ANSWER ------------------------------ It identifies the network-discovery behavior tied to the Public profile as the specific cause using this chapter's own table, explains why no error appears to signal the mismatch, cites this chapter's own warn-box naming this exact symptom, and gives the specific setting location to check and correct.