Networks, Linux and Systems: The Technical Foundations of Cybersecurity Quiz

Quiz: Linux in daily use

Pass mark: 70%. You can retry as many times as you need.

1 A file has the permissions -rwxr-x--- with owner root and group admins. Who can execute it? Single answer Everyone on the system. Only root. Root and members of the group admins. Only members of the group admins.

2 Which command sets a file so that the owner can read and write, the group can only read, and others have no access? Single answer chmod 755 file chmod 640 file chmod 777 file chmod 600 file

3 Why is using sudo for individual commands generally better than working permanently as root? (several answers) Multiple answers possible Actions are logged and tied to a user. It makes any command completely safe. Rights can be limited to specific commands. You do not stay in a permanently all-powerful session.

4 On your lab server you want to know which program listens on which port. Which command gives that information? Single answer whoami pwd sudo ss -tulpn cat /etc/hostname

5 You see many lines like 'Failed password for invalid user admin from 10.10.10.10' within a minute in an authentication log. What is the most reasonable interpretation, and what do you do? (several answers) Multiple answers possible It suggests an automated password-guessing attempt from that source. It proves that the server has been fully compromised. Identify the source and consider rate limiting or key-based authentication. Nothing needs to be done, logs are never useful.