True or False

1. Debian and its derivatives use firewalld rather than iptables for firewall creation and management.

2. Web sites use the standard TCP/IP port 80 to serve unencrypted Web pages

3. Assuming a demilitarized zone (DMZ) is configured, there's no need to set up a separate firewall between the DMZ network and the internal network.

4. A server on a demilitarized zone (DMZ) network may serve data to users on the Internet.

5. The iptables -A Firewall-INPUT -p 50 -j ACCEPT directive accepts input from port 50.

6. The cron and at services enable you to schedule tasks in Linux.

7. AppArmor was developed by the U.S. National Security Agency (NSA) as a mandatory access control system.

8. You can use specific iptables rules to prevent denial of service (DoS) attacks.

9. The iptables -D command temporarily disables the current firewall.

10. Wireless encryption algorithms such as WPA and WPA2 may be cracked if they use weak pre-shared keys based on dictionary words.

11. Demilitarized zone (DMZ) networks replace internal private networks.

12. When configuring obscure ports for a service, configuring different ports for clients and servers is not enough. You also need to configure an open port in the firewall.

13. The Red Hat Security Level Configuration tool is used to configure SELinux.

14. Although AppArmor and SELinux are both mandatory access control systems, they are not compatible.

15. The GNOME uncomplicated firewall (Gufw) firewall configuration tool is available as a GUI-based tool in Ubuntu.

16. Whereas the cron service is a scheduler for jobs to be run on a one-time basis, the at service is a scheduler for jobs to be run on a regular basis.

17. The iptables -s rule is applied to packets that come from the noted destination address.

18. The iptables -j DROP and -j REJECT command options both drop packets.

19. Alternate attack vectors include connections through telephone modems and serial ports.

20. The iptables -R command replaces a rule in a chain of rules.