303-300 - Reliable Latest LPIC Exam 303: Security, version 3.0 Learning Materials

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Lpi 303-300 Exam Syllabus Topics:

Section	Weight	Objectives
Access Control	8%	- Discretionary Access Control 1. File permissions 2. POSIX ACLs 3. Extended attributes - Authentication and Authorization 1. Centralized authentication 2. PAM 3. Multi-factor authentication - Mandatory Access Control 1. SELinux management 2. AppArmor configuration 3. Policy enforcement
Network Security	12%	- Network Intrusion Detection 1. Snort 2. tcpdump 3. Kismet 4. Wireshark - Network Hardening 1. Secure network services 2. TCP wrappers and service restrictions - Virtual Private Networks 1. WireGuard 2. IPsec and strongSwan 3. OpenVPN - Packet Filtering 1. IP sets 2. nftables awareness 3. NAT and connection tracking 4. iptables and ip6tables
Threats and Vulnerability Assessment	3%	- Vulnerability Assessment 1. OpenVAS 2. Risk identification 3. Security scanning - Threat Analysis 1. Host-based threats 2. Credential and confidentiality threats 3. Application threats 4. Network threats
Cryptography	8%	- OpenPGP 1. Web of trust concepts 2. Manage GnuPG keys 3. Sign and encrypt data - Data Encryption 1. Use LUKS and dm-crypt 2. Secure data transmission 3. Encrypt files and storage devices - X.509 Certificates and Public Key Infrastructures 1. Create and manage certificates 2. Certificate revocation and validation 3. Manage certificate authorities
Host Security	9%	- Resource Control 1. ulimits 2. cgroups 3. Process resource management - Host Hardening 1. Secure boot process 2. Kernel runtime protection 3. Service hardening - Host Intrusion Detection 1. AIDE integrity checking 2. Linux Audit system 3. Rootkit detection tools 4. Malware detection

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Lpi LPIC Exam 303: Security, version 3.0 Sample Questions (Q92-Q97):

NEW QUESTION # 92
An X509 certificate contains the following information:
X509v3 Basic Constraints: critical CA:TRUE, pathlen:0
Which of the following statements are true regarding the certificate? (Choose THREE correct answers.)

A. This certificate belongs to a certification authority.
B. This certificate may be used to sign certificates that are not also a certification authority.
C. This certificate may never be used to sign any other certificates.
D. This certificate will not be accepted by programs that do not understand the listed extension.
E. This certificate may be used to sign certificates of subordinate certification authorities.

Answer: A,B,E

NEW QUESTION # 93
Which OpenVPN configuration directive specifies that the tunnel should operate at Layer 3, routing IP packets rather than bridging Ethernet frames?

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

Answer: D

Explanation:
The "dev tun" directive configures OpenVPN to create a Layer 3 (routed) tunnel interface, which encapsulates and routes IP packets between the client and server. In contrast, "dev tap" creates a Layer 2 (bridged) tunnel interface that carries entire Ethernet frames, allowing broadcast traffic and non-IP protocols to pass through the tunnel, which is useful for certain bridging scenarios but generally has more overhead than a routed tun-based configuration.

NEW QUESTION # 94
In an AppArmor profile, what does the "complain" mode do?

A. It blocks all restricted actions and terminates the process.
B. It automatically generates a new profile based on observed behavior.
C. It logs policy violations without enforcing restrictions, similar to SELinux permissive mode.
D. It disables AppArmor for that specific profile only.

Answer: C

Explanation:
When an AppArmor profile is placed into complain mode, actions that would violate the profile's rules are logged but not blocked, allowing an administrator to observe an application's actual behavior before switching the profile to enforce mode. This is conceptually similar to SELinux's permissive mode. The aa-genprof and aa-logprof tools can process these complain-mode logs to help build or refine a profile, but complain mode itself does not automatically generate profiles.

NEW QUESTION # 95
What is the purpose of Linux capabilities, as introduced to divide the traditional all-or-nothing root privilege model?

A. They allow specific, granular privileges (such as binding to low-numbered ports) to be granted to a process without granting full root access.
B. They replace the need for the setuid bit entirely on all binaries.
C. They control network bandwidth allocation per process.
D. They are used only within containerized environments.

Answer: A

Explanation:
Linux capabilities divide the privileges traditionally associated with the root superuser into a set of distinct, individually grantable units, such as CAP_NET_BIND_SERVICE (allowing a process to bind to privileged ports below 1024) or CAP_SYS_TIME (allowing a process to change the system clock). This allows a process or binary to be granted only the specific privileges it actually needs, following the principle of least privilege, rather than requiring full root access or reliance on the traditional setuid bit.

NEW QUESTION # 96
What type of activity does HID monitor for?

A. Malware infections
B. Network traffic
C. Unauthorized access attempts
D. File and folder changes

Answer: C

NEW QUESTION # 97
......

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