CompTIA Exam Prep - ITF+, A+, Network+, Security+, CySA+

 NIST AI Risk Management Framework The NIST Artificial Intelligence Risk Management Framework (AI RMF) is a voluntary, sector‑agnostic, and consensus‑driven framework released by the U.S. National Institute of Standards and Technology on January 26, 2023. Its purpose is to help organizations identify, assess, manage, and reduce risks associated with AI systems across their entire lifecycle. The framework remains a living document and is updated periodically. It is intended to support: Trustworthy AI development and deployment Decision-making about AI risks Continual monitoring and governance Cross-functional collaboration across technical, operational, and executive teams  To help organizations operationalize the framework, NIST provides companion resources, including the AI RMF Playbook, Crosswalks, Roadmap, and specialized profiles (including the Generative AI Profile, released July 26, 2024).  1. Purpose and Philosophy of the AI RMF Unlike rigid compliance checklists, ...

 MIT AI Risk Repository  The MIT AI Risk Repository is a major research initiative created to provide the world’s most comprehensive, structured, and unified resource on risks posed by artificial intelligence. It functions as a living, continuously updated database of AI risks, taxonomies, and documented sources, developed by the MIT AI Risk Initiative / MIT FutureTech Group. It is publicly accessible at airisk.mit.edu. 1. What the MIT AI Risk Repository Is According to MIT, the AI Risk Repository is: A centralized, living database of AI-related risks, currently listing 700–1700+ risks depending on the version referenced (MIT's web version lists 1700+, while the academic paper documents 777 risks). Compiled from dozens of academic, government, and industry AI frameworks (43–74 frameworks, depending on the version). Designed to create a shared vocabulary for researchers, policymakers, auditors, and companies when discussing AI risks. Open-access and designed to be extensible, m...

 OWASP GenAI Security Project What it is & why it exists A flagship, open-source initiative by OWASP focused on identifying, mitigating, and documenting security and safety risks in generative AI (LLMs and agentic systems). Evolved from the original “Top 10 for LLM Application Security” (launched May 2023) into a broader project with 600+ experts, 130+ companies, and ~8,000 community members.  Core deliverables & guidance OWASP Top 10 for LLMs (2025) Lists the most critical vulnerabilities in LLM-based apps (e.g., prompt injection, RAG issues, DoS).  Widely used by regulators and standards bodies (NIST, MITRE). Updated regularly, v3 released at the end of 2024, added RAG-specific risks. Agentic AI (autonomous agents) Introduced Top 10 for Agentic Applications, covering threats from AI that act (not just output text).  Includes guides like: Threats & Mitigations taxonomy Multi-Agent Threat Modeling Securing Agentic Applications Agentic Security Solutions L...

 Spine‑and‑Leaf Topology Spine‑and‑leaf is a two‑tier network architecture designed to deliver: predictable low latency high bandwidth full‑mesh connectivity scalable east–west traffic handling It is widely used in modern data centers, especially those running virtualization, containers, microservices, and cloud workloads. Architecture Overview The architecture has only two layers: 1. Leaf Layer (Access Layer) These switches connect directly to servers, storage, and edge devices. Every leaf switch connects to every spine switch. Leaf switches do not connect to other leaf switches. Leaf Responsibilities: Provide the access point for servers Handle local switching Load balance traffic across multiple spines Participate in routing (typically with ECMP: Equal-cost multi-path) 2. Spine Layer (Core Layer) The spine is the backbone of the network. Spine switches connect only to leaf switches, not to each other. Their main purpose is to ensure high‑speed, non‑blocking packet forwarding. Sp...

Fibre Channel: A Network+ and Server+ Exam Prep Guide What Is Fibre Channel? Fibre Channel (FC) is a high-speed networking technology built specifically for storage: it moves block-level data between servers and storage arrays over a dedicated network, separate from the everyday Ethernet/IP traffic on the LAN. It's the backbone technology behind most enterprise storage area networks (SANs) . It matters to both exams because it sits right at the intersection they each cover from a different side. Network+ treats Fibre Channel as one of several storage-networking options a candidate needs to recognize and compare against alternatives like iSCSI and NAS. Server+ goes a level deeper, since Server+ candidates are the ones actually racking the hardware, installing host bus adapters, and configuring a server's connection into the SAN. A Quick Refresher on How Fibre Channel Works Fibre Channel runs on its own dedicated hardware and addressing scheme, entirely separate from Ethernet: H...

LDAP Injection Attack LDAP Injection is a type of injection attack where an attacker manipulates LDAP (Lightweight Directory Access Protocol) queries by injecting malicious input into fields that are used to build LDAP filters. It is similar in concept to SQL injection, but targets LDAP directory services such as: Active Directory OpenLDAP Oracle Internet Directory Novell eDirectory LDAP is often used for: Authentication (“log in with your corporate account”) Authorization (retrieving user permissions) Directory lookups (searching for users, groups, devices) When developers build LDAP queries using unsanitized user input, attackers can alter query logic and access unauthorized data, or bypass authentication entirely. How LDAP Queries Work A typical LDAP search filter looks like this: (&(objectClass=person)(uid=jsmith)) This means: Find entries that are person objects With a uid of jsmith When a login form accepts a username and password, the backend might form a query like: (&(...

 What is CREST in Penetration Testing? CREST (Council of Registered Ethical Security Testers) is an international, not‑for‑profit accreditation and certification body for the cybersecurity industry. It sets professional standards for penetration testers and security service providers. Its certifications and company accreditations provide assurance that pentesting is performed ethically, competently, and using consistent, validated methodologies. CREST plays two main roles: 1. Certifying individuals — penetration testers and threat‑intelligence/incident‑response specialists. 2. Accrediting organizations — pentesting consultancies that meet CREST’s operational, technical, and quality standards. Why CREST Exists CREST was created to address the risks of unregulated and inconsistent penetration testing, ensuring companies can trust the people and organizations performing these services. Its mission includes: Providing a “ stamp of approval ” for high‑quality pentesting. Ensuring pente...

  What Is a LAMP Server? A LAMP server is a classic, widely used web service stack consisting of: Together, these technologies create a fully functional environment for hosting dynamic websites and web applications. 1. Linux – The Foundation (Operating System) Linux is the underlying OS that provides: File system organization Permissions & user access control Package management System security Networking capabilities Popular distros for LAMP servers: Ubuntu Server Debian CentOS / Rocky Linux Red Hat Enterprise Linux Linux’s strengths include: Stability and uptime Security & permission model Command-line tools for automation Massive community support Cost effectiveness (usually free) 2. Apache – The Web Server Apache HTTP Server is responsible for: Accepting requests from web browsers Processing those requests Serving web pages, images, scripts, and files Key features: Modular architecture Modules like: mod_php – allows PHP to run inside Apache mod_ssl – enables HTTPS mod_re...

  What Is Netcat? Netcat (often called nc) is a small, command‑line networking utility commonly described as the “Swiss Army knife of TCP/IP.” It can: Create TCP or UDP connections Listen on ports Transfer data between systems Read or write directly to network sockets Perform banner grabbing Assist in debugging and network troubleshooting In cybersecurity and IT operations, Netcat is widely used because it’s: Lightweight Built into many Linux distros Available for macOS and Windows Extremely flexible Because of this flexibility, Netcat is used by penetration testers, system admins, and, unfortunately, malicious actors. Legitimate Uses of Netcat Professionals use Netcat for completely valid reasons, such as: Network Debugging Checking whether a specific port is open, diagnosing connection issues, or testing firewall rules. System Administration Sending files between machines internally, simple remote management in test environments, etc. Security Testing (Ethical) Pen testers simula...

Understanding Octal Permissions in Linux Linux file permissions are often represented in two ways: 1. Symbolic notation → e.g., rwxr-xr-- 2. Octal (numeric) notation → e.g., 754 Octal notation is simply a numeric shorthand for symbolic permissions. 1. Symbolic Permissions (The Long Form) Linux permissions operate on three categories: And each category can have these three permission types: Example: rwx r-x r-- Breaks down as: 2. The Numeric (Octal) System For each of the permissions (r, w, x), Linux assigns a numeric value: To convert symbolic to octal, add the values: Examples: rwx → 4 + 2 + 1 → 7 rw- → 4 + 2 + 0 → 6 r-x → 4 + 0 + 1 → 5 r-- → 4 + 0 + 0 → 4 --- → 0 + 0 + 0 → 0 3. Putting It Together: Octal Notation A full permission set requires 3 octal digits (user, group, others): (user)(group)(others) Example: 754 Breaks down to: 7 = rwx (owner) 5 = r-x (group) 4 = r-- (others) Symbolically: Rwx r-x r-- 4. Common Octal Permission Values For Files For Directories 5. Special Bits (Set...