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

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:

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

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

1. Which of the following is an example of an HID tool?

A) Security information and event management (SIEM) system
B) Antivirus software
C) Intrusion prevention system (IPS)
D) Firewall


2. What is a man-in-the-middle attack?

A) An attack that aims to steal sensitive information
B) An attack that floods a network or server with traffic to make it unavailable
C) An attack that intercepts communications between two parties to steal information
D) An attack that targets a specific user or organization


3. Which command is used to create an encrypted LUKS-formatted block device?

A) cryptsetup open /dev/sdX
B) cryptsetup luksFormat /dev/sdX
C) dm-crypt --format /dev/sdX
D) mkfs.luks /dev/sdX


4. Which of the following statements is true about chroot environments?

A) Programs are not able to set a chroot path by using a function call, they have to use the command chroot
B) Hard links to files outside the chroot path are not followed, to increase security
C) Symbolic links to data outside the chroot path are followed, making files and directories accessible
D) The chroot path needs to contain all data required by the programs running in the chroot environment
E) When using the command chroot, the started command is running in its own namespace and cannot communicate with other processes


5. What is the purpose of a TLSA record in DANE?

A) To provide information about a TLS server
B) To map a domain name to an IP address
C) To sign a TLS server's public key
D) To authenticate a DNS server


Solutions:

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

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