Category: A+ Core 2 (220-1202)
The CompTIA A+ Core 2 (220-1202) examination tests the practical, day-to-day software and administrative skills required of modern technical support specialists. Entry-level and transitioning IT professionals must manage diverse client environments—including Windows, macOS, Linux, ChromeOS, and mobile operating systems—while defending systems against malware and adhering to strict change management protocols.
This category delivers structured study resources, practical walkthroughs, and performance-based question (PBQ) review material mapped directly to Core 2 exam domains. Explore step-by-step operating system recovery guides, command-line interface (CLI) cheat sheets, malware remediation procedures, and scripting basics to ensure you pass your exam and excel in operational support roles.
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Analyzing Memory Dumps with Volatility 3
Volatility 3 reconstructs kernel states and user-space artifacts from volatile memory dumps to detect fileless malware, rootkits, and advanced persistent threats (APTs) that evade traditional disk-based forensics. The framework translates linear physical memory bytes into logical virtual abstractions by traversing operating system data structures and dynamic symbol tables, exposing injected shellcode and hidden network connections.…
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Hardware Security: TPM vs. HSM & Secure Boot
Hardware roots of trust establish an immutable cryptographic foundation, preventing unauthorized firmware execution and securing cryptographic material against physical and logical extraction. Security architects deploy these specialized hardware components to anchor system integrity and enforce cryptographic boundaries across enterprise endpoints and centralized infrastructure. Secure Boot and the UEFI Trust Chain Secure Boot, a Unified Extensible…
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Troubleshooting Network Security: DNSSEC, DKIM, and TLS
Cryptographic network protocols—DNSSEC, DKIM, and TLS—ensure data integrity, origin authentication, and transit confidentiality across untrusted networks. Security architects must systematically diagnose cryptographic failures, certificate chain breaks, and configuration mismatches within these protocols to restore secure communications and prevent man-in-the-middle (MitM) attacks. While endpoint hardening restricts localized execution, as detailed in Securing Endpoints: EDR/XDR Architecture & SELinux,…
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Securing Endpoints: EDR/XDR Architecture & SELinux
Endpoint Detection and Response (EDR), Extended Detection and Response (XDR), and Security-Enhanced Linux (SELinux) integrate to enforce deterministic access controls and dynamic behavioral analytics against advanced persistent threats. This defense-in-depth architecture prevents unauthorized kernel-level execution while continuous telemetry streams enable real-time threat hunting, automated isolation, and zero-day mitigation. EDR and XDR Architecture Mechanics EDR platforms…
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Writing a Python Script to Automate Patching via SSH
Automated patch management scripts utilize the Secure Shell (SSH) protocol to deploy security updates systematically across distributed server fleets, eliminating manual misconfigurations and accelerating vulnerability remediation. By leveraging Python libraries to handle cryptographic handshakes and command execution, security engineers enforce baseline compliance while maintaining secure, programmatic access to remote infrastructure. SSH Automation Mechanics and Architecture…
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OT/ICS Security: Purdue Model Explained
The Purdue Enterprise Reference Architecture (PERA) provides a structural framework for segmenting Operational Technology (OT) and Industrial Control Systems (ICS) from Enterprise IT environments. By enforcing strict hierarchical data flows, the Purdue Model minimizes the attack surface and prevents adversaries from pivoting from internet-facing corporate networks into critical physical infrastructure. Security professionals must master this…
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Advanced Crypto: Homomorphic Encryption & Forward Secrecy
Homomorphic encryption enables computational engines to execute arbitrary functions directly on ciphertext without exposing the underlying plaintext, securing data in use. Forward secrecy protects historical network communications by guaranteeing that a future compromise of a long-term cryptographic identity key exposes zero past ephemeral session keys. Homomorphic Encryption Mechanics Fully Homomorphic Encryption (FHE) constructs a mathematical…
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Post-Quantum Cryptography (PQC) for CompTIA SecurityX (CAS-005)
Post-Quantum Cryptography (PQC) neutralizes the existential threat quantum computing poses to current asymmetric encryption algorithms by implementing mathematically resistant cryptographic primitives. Security architects deploy PQC to secure long-term data confidentiality and integrity against cryptanalytically advanced adversaries executing “harvest now, decrypt later” attack vectors. Quantum Threat Mechanics and Cryptographic Vulnerability Quantum computers utilize qubits and superposition…