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Lpi LPIC Exam 303: Security, version 3.0 : 303-300

303-300

Exam Code: 303-300

Exam Name: LPIC Exam 303: Security, version 3.0

Updated: Sep 19, 2026

Q & A: 163 Questions and Answers

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Lpi 303-300 Exam Syllabus Topics:
SectionObjectives
Cryptography- OpenSSL usage and configuration
- Data encryption and signing
- Public key infrastructure (PKI)
Vulnerability Assessment and Monitoring- Intrusion detection systems (IDS)
- Log analysis and auditing
Application Security- Secure software configuration
- Container and service security
Network Security- Firewalls (iptables, nftables)
- Secure network services
- VPN technologies
Security Administration- Authentication mechanisms
- System hardening
Access Control- SELinux and AppArmor
- Mandatory Access Control (MAC)
- Discretionary Access Control (DAC)
Lpi LPIC Exam 303: Security, version 3.0 Sample Questions:

Question #1
What is the purpose of a Certificate Revocation List (CRL)?

A. It lists certificates that have been revoked by the issuing CA before their expiration date.
B. It replaces the need for certificate expiration dates.
C. It lists all valid certificates currently trusted by a client.
D. It lists certificates that have not yet been issued.


Question #2
What is a symmetric key?

A. A key used for encryption that is different from the key used for decryption
B. A key used for both encryption and decryption that is generated randomly
C. A key used for decryption that is different from the key used for encryption
D. A key used for encryption and decryption that is the same


Question #3
What is a rootkit?

A. A type of virus
B. A type of phishing scam
C. A type of malware that disguises itself as legitimate software
D. A type of denial-of-service attack


Question #4
Linux Extended File Attributes are organized in namespaces. Which of the following names correspond to existing attribute namespaces?(Choose THREE correct answers.)

A. owner
B. trusted
C. default
D. user
E. system


Question #5
What does the following iptables rule accomplish:
iptables -A INPUT -s !127.0.0.0/8 -p tcp -dport 111 -j DROP

A. Drops all packets destined for port 111 which originate from the local machine.
B. Drops all packets destined for port 111 unless they are from the local machine.
C. Drops all packets originating from the local machine unless they are destined for port 111.
D. Drops all packets from the LAN destined for port 111.


Solutions:

Question #1
Correct Answer: A
Question #2
Correct Answer: D
Question #3
Correct Answer: C
Question #4
Correct Answer: B,D,E
Question #5
Correct Answer: B

303-300 Related Exams
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300-100J - LPIC-3 Exam 300: Mixed Environments, version 1.0 (300-100日本語版)
303-300-JPN - LPIC Exam 303: Security, version 3.0 (303-300日本語版)
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