Lpi LPIC Exam 303: Security, version 3.0 - 303-300 Exam Questions [2026]

QUESTION NO: 1
Which DNS label points to the DANE information used to secure HTTPS connections to
https://www.example.com/?

A. www.example.com B. dane.www.example.com C. soa.example.com D. example.com E. _443_tcp.www.example.com

Correct Answer: E

QUESTION NO: 2
What is a plaintext?

A. The encrypted message B. The key used to encrypt the message C. The original message before encryption D. The algorithm used to encrypt the message

Correct Answer: C

QUESTION NO: 3
Which of the following terms refer to existing scan techniques with nmap?
(Choose TWO correct answers.)

A. UDP SYN Scan B. IP Scan C. Zero Scan D. Xmas Scan E. FIN Scan

Correct Answer: D,E

QUESTION NO: 4
Which of the following commands defines an audit rule that monitors read and write operations to the file/ etc/firewall/rules and associates the rule with the name firewall?

A. auditctl -N firewall -r r: /etc/firewall/rules -r w: etc/firewall/rules B. auditctl -w /etc/firewall/rules -p rw -k firewall C. auditctl -A -f /etc/firewall/rules -o r -o w -l firewall D. echo "n: firewall r:/etc/firewall/rules: w:/etc/firewall/rules:" | auditctl ~ E. auditctl --read /etc/firewall/rules --write /etc/firewall/rules --label firewall

Correct Answer: B

QUESTION NO: 5
Which file is used to configure AIDE?

A. /etc/audit/auditd.conf B. /etc/aide/aide.conf C. /etc/rkhunter.conf D. /etc/maldet.conf

Correct Answer: B

QUESTION NO: 6
What is a certificate chain?

A. A chain of public and private keys used for encryption and decryption B. A sequence of certificates used to verify the authenticity of a digital certificate C. A sequence of public and private keys used for encryption and decryption D. A chain of digital signatures used to verify the authenticity of a certificate

Correct Answer: B