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+;;; 102-network-tools-lesson.el --- network-tools-lesson
+
+(defun network-tools-lesson ()
+  "Linux+ lesson for network troubleshooting tools."
+  (interactive)
+
+  (delete-other-windows)
+
+  (let ((buf (get-buffer-create "*Network Tools Lesson*"))
+        (shell (or shell-file-name
+                   (getenv "SHELL")
+                   "/bin/sh")))
+
+    (switch-to-buffer buf)
+
+    (read-only-mode -1)
+    (erase-buffer)
+
+    (insert
+     "Linux+ Lesson: Network Troubleshooting Tools\n"
+     "============================================\n\n"
+
+     "Concept:\n"
+     "Linux administrators must diagnose network problems quickly.\n"
+     "CompTIA Linux+ expects familiarity with modern networking tools,\n"
+     "basic connectivity testing, interface inspection, DNS testing,\n"
+     "and socket/process inspection.\n\n"
+
+     "Core commands:\n\n"
+
+     "ip addr\n"
+     "    Display IP address information.\n\n"
+
+     "ip route\n"
+     "    Display routing table.\n\n"
+
+     "ping\n"
+     "    Test ICMP connectivity.\n\n"
+
+     "ss -tulpn\n"
+     "    Show listening TCP/UDP sockets and associated processes.\n\n"
+
+     "hostnamectl\n"
+     "    Show or change persistent hostname.\n\n"
+
+     "dig\n"
+     "    Query DNS servers.\n\n"
+
+     "traceroute\n"
+     "    Show network path hops.\n\n"
+
+     "curl\n"
+     "    Retrieve data from URLs and test HTTP services.\n\n"
+
+     "wget\n"
+     "    Download files from remote systems.\n\n"
+
+     "nmap\n"
+     "    Network discovery and port scanning.\n\n"
+
+     "Hands-on tasks:\n\n"
+
+     "1. Display IP addresses:\n"
+     "   ip addr\n\n"
+
+     "2. Display routes:\n"
+     "   ip route\n\n"
+
+     "3. Test connectivity:\n"
+     "   ping -c 4 google.com\n\n"
+
+     "4. Inspect listening services:\n"
+     "   ss -tulpn\n\n"
+
+     "5. Query DNS:\n"
+     "   dig google.com\n\n"
+
+     "6. Download a webpage:\n"
+     "   curl https://example.com\n\n"
+
+     "7. Download a file:\n"
+     "   wget https://example.com/index.html\n\n"
+
+     "8. Display hostname:\n"
+     "   hostnamectl\n\n"
+
+     "9. Run a localhost scan:\n"
+     "   sudo nmap localhost\n\n"
+
+     "Important Linux+ exam traps:\n\n"
+
+     "- `ip` replaces many older networking tools.\n"
+     "- `ss` is preferred over `netstat` on modern systems.\n"
+     "- `dig` is for DNS lookups.\n"
+     "- `ping` uses ICMP.\n"
+     "- `curl` is commonly used for API and HTTP testing.\n"
+     "- `wget` is commonly used for recursive or file downloads.\n"
+     "- `nmap` is heavily associated with network discovery and auditing.\n"
+     "- `hostnamectl` changes persistent hostnames.\n\n"
+
+     "Debian/Rocky notes:\n\n"
+
+     "- `dig` may require package installation.\n"
+     "- Debian package: dnsutils\n"
+     "- Rocky package: bind-utils\n\n"
+
+     "When finished, run:\n\n"
+     "M-x network-tools-quiz\n")
+
+    (goto-char (point-min))
+    (view-mode 1)
+
+    (split-window-below)
+    (other-window 1)
+
+    (let ((term (get-buffer "*term*")))
+      (if (buffer-live-p term)
+          (switch-to-buffer term)
+        (ansi-term shell "term")))
+
+    (other-window -1)))
+
+;;; 102-network-tools-lesson.el ends here