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

  • Exam Code: 303-300
  • Exam Name: LPIC Exam 303: Security, version 3.0
  • Updated: Aug 23, 2026
  • Q & A: 163 Questions and Answers

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

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Lpi 303-300 Exam Syllabus Topics:

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

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

1. Which of the following commands adds users using SSSD's local service?

A) sss_adduser
B) sss_add
C) sss-addlocaluser
D) sss_useradd
E) sss_local_adduser


2. Which command is used to set the owner and group of a file in Linux?

A) chown
B) chgrp
C) chmod
D) setfacl


3. Which PAM module checks new passwords against dictionary words and enforces complexity?
(Specially the module name only without any path.)
Solution: pam_cracklib
Determine whether the given solution is correct?

A) Incorrect
B) Correct


4. What option of mount.cifs specifies the user that appears as the local owner of the files of a mounted CIFS share when the server does not provide ownership information? (Specify ONLY the option name without any values or parameters.) Solution: uid=arg Determine whether the given solution is correct?

A) Incorrect
B) Correct


5. 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


Solutions:

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

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