Linux administration final review quiz

Ten questions across the whole chapter. Each answer explains why. Aim for eight; if you miss any, return to the matching lesson or chapter.

What makes a requirement testable?
A service answers locally but not from the partner. Which layer is the likely suspect?
A page gives 403 and ls -Z shows var_t. What fixes it?
httpd fails to start after Listen 8090: "could not bind… Permission denied". What is missing?
Which command shows that only the intended caller is allowed?
Which archive options keep ACLs and labels?
A systemd timer must run a missed backup after the machine was off. Which setting?
You changed a firewall rule and a file label at once and the fault is gone. What is the problem?
What is the best next step after a successful fix?
Where do you go after a stable manual build?