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

303-300 real exams

Exam Code: 303-300

Exam Name: LPIC Exam 303: Security, version 3.0

Updated: Aug 04, 2026

Q & A: 163 Questions and Answers

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Lpi 303-300 Exam Syllabus Topics:

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

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

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

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


2. What is the purpose of NSEC3 in DNSSEC?

A) To sign a DNS zone
B) To prevent zone enumeration
C) To authenticate a DNS server
D) To provide information about DNSSEC key signing keys


3. Which of the following openssl commands generates a certificate signing request (CSR) using the already existing private key contained in the file private/ keypair.pem?

A) openssl req -key private/keypair.pem -out req/csr.pem
B) openssl gencsr -new- key private/keypair.pem -out req/csr.pem
C) openssl req - new -key private/keypair.pem -out req/csr.pem
D) openssl gencsr -key private/keypair.pem -out req/csr.pem


4. What is the purpose of a DNSKEY record in DNSSEC?

A) To sign a DNS zone
B) To map an IP address to a hostname
C) To verify the authenticity of a DNS query
D) To provide information about a DNS server


5. Which file defines the default set of resource limits, such as maximum open files or processes, applied to users via PAM?

A) /etc/security/limits.conf
B) /etc/sysctl.conf
C) /etc/login.defs
D) /etc/pam.d/common-session


Solutions:

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

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