Continue your lesson
Connect the command you run to the file, process, service, permission, or kernel state it changes.
Block 1 of 1Compare nftables · iptables · UFW · firewalld
Current · 8 min
Compare nftables · iptables · UFW · firewalld
Optional concept notes
nftables
Provides the modern Linux kernel packet-filtering rules framework.
iptables
Manages legacy netfilter packet-matching chains and actions.
UFW
Simplifies host firewall policy through an uncomplicated command interface.
firewalld
Manages dynamic firewall zones services and runtime or permanent rules.
Complete one provider lesson, then answer four related questions. That is enough for today; more practice is optional.
Your lesson stays open here while the provider opens in another tab. Choose one source; the notes above are optional.
Practice the reasoning here
Use a disposable Linux system. Predict a command's effect, run it, inspect exit status and logs, then restore the starting state.
- State the expected result before changing or testing anything.
- Name the observation, command, log, or report that would confirm it.
- Explain why the closest alternative does not fit the same requirement.
Check the whole objective
This unlocks objective 3.2 for recall. The latest checkpoint needs 70% or higher; a lower result puts the lesson back near the front of your timeline.