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Updated: Aug 22, 2026

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Lpi 303-300 Exam Overview:

Certification Vendor:Linux Professional Institute (LPI)
Exam Name:LPIC Exam 303: Security, Version 3.0
Exam Number:303-300
Exam Format:Multiple Choice, Fill in the Blank
Certificate Validity Period:5 years
Passing Score:500/800
Exam Duration:90 minutes
Real Exam Qty:60
Related Certifications:LPIC-3 Security
Exam Price:$200 USD
Available Languages:English, Japanese
Sample Questions:Lpi 303-300 Sample Questions
Exam Way:Pearson VUE Test Center or Online Proctored Exam (OnVUE)
Pre Condition:An active LPIC-2 certification is required to obtain the LPIC-3 Security certification. LPIC-2 and LPIC-3 exams may be taken in any order.
Official Syllabus URL:https://www.lpi.org/our-certifications/exam-303-objectives/

Lpi 303-300 Exam Syllabus Topics:

SectionWeightObjectives
Topic 1: Access Control8%- Authentication and Authorization
  • 1. PAM
  • 2. Centralized authentication
  • 3. Multi-factor authentication
- Mandatory Access Control
  • 1. Policy enforcement
  • 2. AppArmor configuration
  • 3. SELinux management
- Discretionary Access Control
  • 1. POSIX ACLs
  • 2. File permissions
  • 3. Extended attributes
Topic 2: Host Security9%- Host Hardening
  • 1. Kernel runtime protection
  • 2. Secure boot process
  • 3. Service hardening
- Resource Control
  • 1. cgroups
  • 2. Process resource management
  • 3. ulimits
- Host Intrusion Detection
  • 1. Malware detection
  • 2. Linux Audit system
  • 3. AIDE integrity checking
  • 4. Rootkit detection tools
Topic 3: Threats and Vulnerability Assessment3%- Vulnerability Assessment
  • 1. Security scanning
  • 2. OpenVAS
  • 3. Risk identification
- Threat Analysis
  • 1. Host-based threats
  • 2. Network threats
  • 3. Application threats
  • 4. Credential and confidentiality threats
Topic 4: Network Security12%- Network Hardening
  • 1. TCP wrappers and service restrictions
  • 2. Secure network services
- Network Intrusion Detection
  • 1. tcpdump
  • 2. Snort
  • 3. Wireshark
  • 4. Kismet
- Packet Filtering
  • 1. nftables awareness
  • 2. IP sets
  • 3. NAT and connection tracking
  • 4. iptables and ip6tables
- Virtual Private Networks
  • 1. WireGuard
  • 2. OpenVPN
  • 3. IPsec and strongSwan
Topic 5: Cryptography8%- X.509 Certificates and Public Key Infrastructures
  • 1. Certificate revocation and validation
  • 2. Manage certificate authorities
  • 3. Create and manage certificates
- Data Encryption
  • 1. Secure data transmission
  • 2. Encrypt files and storage devices
  • 3. Use LUKS and dm-crypt
- OpenPGP
  • 1. Manage GnuPG keys
  • 2. Sign and encrypt data
  • 3. Web of trust concepts

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

1. What is the purpose of TSIG in DNS?

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


2. What is the purpose of IP sets?

A) They group together IP addresses and networks that can be referenced by the network routing table.
B) They group together IP addresses and user names that can be referenced from /etc/hosts.allow and /etc/hosts.deny
C) They group together IP addresses that can be referenced by netfilter rules.
D) They group together IP and MAC addresses used by the neighbors on the local network.
E) They group together IP addresses that are assigned to the same network interfaces.


3. Which package management tools can be used to verify the integrity of installed files on a Linux system?

A) dpkg and aptitude
B) APT and YUM
C) RPM and DPKG
D) yum and zypper


4. Which of the following methods can be used to deactivate a rule in Snort? (Choose TWO correct answers.)

A) By placing a pass rule in local.rules and restarting Snort.
B) By adding a pass rule to /etc/snort/rules.deactivated and waiting for Snort to reload its rules files automatically.
C) By deleting the rule and waiting for Snort to reload its rules files automatically.
D) By placing a # in front of the rule and restarting Snort.


5. Which OpenVPN configuration directive specifies that the tunnel should operate at Layer 3, routing IP packets rather than bridging Ethernet frames?

A) topology subnet
B) dev tap
C) proto udp
D) dev tun


Solutions:

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

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