firewalld quiz
Ten questions across the whole chapter. Each answer explains why. Aim for eight before moving on to chapter 21.
- Which command prints the zones that are in use?
- A zone has the source 10.0.0.5 and the interface zone is public. Packets from 10.0.0.5 are judged by...
- What must you do after firewall-cmd --permanent --add-service=http?
- Which option makes a rule disappear after a time?
- Which command answers yes or no about a service in the saved configuration?
- How do you open a non-standard port 9000/tcp permanently?
- A client gets "Connection refused" for a port the firewall allows. Where do you look?
- Which zone silently discards traffic?
- A client times out instead of being rejected. What do you suspect?
- Why not simply stop firewalld to make an application work?