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

303-300 pass collection

Exam Code: 303-300

Exam Name: LPIC Exam 303: Security, version 3.0

Updated: Aug 10, 2026

Q & A: 163 Questions and Answers

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Lpi 303-300 Exam Syllabus Topics:

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

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

1. Which PAM module is used to enforce password complexity requirements, such as minimum length and character class requirements?

A) pam_cracklib or pam_pwquality
B) pam_limits
C) pam_unix
D) pam_access


2. What is the purpose of the GnuPG "trust level" assigned to a key, as opposed to a signature on that key?

A) It is identical in meaning to a key signature and is redundant.
B) It determines the key's expiration date.
C) It indicates how strongly the key's authenticity has been verified.
D) It indicates how much the owner trusts that key's holder to properly verify and sign other people's keys.


3. What is the purpose of the OpenVPN "tls-auth" or "tls-crypt" directive?

A) To add an additional layer of HMAC authentication (or full encryption, with tls-crypt) to the TLS control channel, protecting against certain DoS and port-scanning attacks.
B) To disable TLS entirely and use a static key instead.
C) To compress the VPN traffic.
D) To generate the server's X.509 certificate automatically.


4. What is social engineering?

A) A type of malware that disguises itself as legitimate software
B) A type of virus
C) A type of attack that exploits human psychology to gain access to sensitive information
D) A type of denial-of-service attack


5. Which directive is used in an OpenVPN server configuration in order to send network configuration information to the client? (Specify ONLY the option name without any values or parameters.) Solution: push Determine whether the given solution is correct?

A) Incorrect
B) Correct


Solutions:

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

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