LCA System Security & Firewall Management

Question 1

Which command is used to check the status of the firewall on a Linux system?

Accepted Answer

firewalld-cmd --state

Answer

iptables --status

Answer

systemctl firewall status

Answer

ufw status

Question 2

What does the Linux command 'iptables' manage?

Accepted Answer

Network traffic filtering

Answer

User accounts

Answer

File permissions

Answer

Service daemons

Question 3

Which tool simplifies firewall management on many Linux distributions?

Accepted Answer

firewalld

Answer

ufw

Answer

tcpdump

Answer

fail2ban

Question 4

What port number does SSH use by default?

Accepted Answer

22

Answer

21

Answer

80

Answer

443

Question 5

What is the primary purpose of Fail2Ban?

Accepted Answer

Intrusion prevention

Answer

Log monitoring

Answer

Firewall configuration

Answer

User management

Question 6

Which file contains firewall rules in iptables?

Accepted Answer

/etc/sysconfig/iptables

Answer

/etc/firewall/rules

Answer

/etc/iptables.rules

Answer

/etc/firewalld.conf

Question 7

What command reloads firewall rules in firewalld?

Accepted Answer

firewall-cmd --reload

Answer

service firewalld restart

Answer

iptables-restart

Answer

systemctl restart firewall

Question 8

Which of the following ports should be closed to reduce attack surface on a server?

Accepted Answer

Unused services ports

Answer

Port 80

Answer

Port 22

Answer

Port 443

Question 9

Which Linux security module provides Mandatory Access Control?

Accepted Answer

SELinux

Answer

AppArmor

Answer

iptables

Answer

firewalld