Troubleshooting & Network Security
NAT, firewalls, layered troubleshooting, and a full connection diagnosis lab.
1
NAT, Firewalls & Routers
ReadingHow NAT, routers, and firewalls shape inbound and outbound traffic at the network edge.
15 min
+24 XP
2
Network Troubleshooting Steps
ReadingA layered checklist: link, IP, gateway, DNS, and application—with copy-paste commands.
15 min
+23 XP
3
Lab — Diagnose a Broken Connection
ReadingRun ping, dig, and curl in order to isolate DNS vs routing vs TLS failures.
25 min
+23 XP
4
Quiz — Troubleshooting & Network Security
Practice Quiz10-question module quiz on NAT, firewalls, routers, and layered network troubleshooting.
10 min
+23 XP