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

303-300
  • Exam Code: 303-300
  • Exam Name: LPIC Exam 303: Security, version 3.0
  • Updated: Aug 25, 2026
  • Q & A: 163 Questions and Answers
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Lpi 303-300 Exam Syllabus Topics:

SectionObjectives
Topic 1: Network Security- Firewalls (iptables, nftables)
- VPN technologies
- Secure network services
Topic 2: Cryptography- Data encryption and signing
- Public key infrastructure (PKI)
- OpenSSL usage and configuration
Topic 3: Security Administration- System hardening
- Authentication mechanisms
Topic 4: Application Security- Container and service security
- Secure software configuration
Topic 5: Access Control- Mandatory Access Control (MAC)
- SELinux and AppArmor
- Discretionary Access Control (DAC)
Topic 6: Vulnerability Assessment and Monitoring- Log analysis and auditing
- Intrusion detection systems (IDS)

Lpi LPIC Exam 303: Security, version 3.0 Sample Questions:

1. What is the purpose of TSIG in DNS?

A) To provide information about DNS servers
B) To encrypt DNS queries
C) To map a domain name to an IP address
D) To sign DNS messages for secure communication


2. Which of the following statements are valid wireshark capture filters? (Choose TWO correct answers.)

A) portrange 10000-15000 and tcp
B) tcp portrange 10000-15000
C) port range 10000:tcp-15000:tcp
D) port-range tcp 10000-15000
E) portrange 10000/tcp-15000/tcp


3. In an AppArmor profile, what does the "complain" mode do?

A) It disables AppArmor for that specific profile only.
B) It logs policy violations without enforcing restrictions, similar to SELinux permissive mode.
C) It automatically generates a new profile based on observed behavior.
D) It blocks all restricted actions and terminates the process.


4. Which of the following lines in an OpenSSL configuration adds an X 509v3 Subject Alternative Name extension for the host names example.org and www.example.org to a certificate?

A) subject= CN= www.example.org, CN=example.org
B) extension= SAN: www.example.org, SAN:example.org
C) subjectAltName = DNS: www.example.org, DNS:example.org
D) commonName = subjectAltName= www.example.org, subjectAltName = example.org
E) subjectAltName: www.example.org, subjectAltName: example.org


5. Which tool is commonly used to perform a comprehensive network port scan, including service and OS fingerprinting, as part of a security assessment?

A) netstat
B) nmap
C) Wireshark
D) tcpdump


Solutions:

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

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