📚 My Cybersecurity Learning Journey
Key Topics from a 17-Hour Security+ Course
🔹 CIA Triad Explained
Confidentiality: Ensuring that sensitive data is only accessed by authorized users. This is often achieved using encryption and access controls.
Integrity: Ensuring data is accurate and untampered. Techniques like hashing, checksums, and digital signatures help validate that data hasn't been altered.
Availability: Making sure systems and data are accessible when needed. Achieved through backups, redundancy, load balancing, and fault-tolerant design.
🔹 Types of Threats
- Malware: Includes viruses, ransomware, worms, and trojans that compromise devices or networks.
- Social Engineering: Manipulating users into giving up confidential info. Example: Phishing emails.
- Insider Threats: Employees or contractors misusing access, accidentally or intentionally.
- Advanced Persistent Threats (APTs): Long-term targeted attacks, often by well-funded threat actors.
- Zero-Day Vulnerabilities: Exploits for unknown software bugs before a fix is available.
🔹 Networking Fundamentals for Security
Studied basic networking concepts: IP addressing (IPv4/IPv6), MAC addresses, ports, and protocols like TCP/UDP. Learned about the OSI model, and how each layer relates to security implementations. Gained insights into VLANs, VPNs, routers, switches, and secure architecture design.
🔹 Security Protocols
- SSL/TLS: Secures web communication via encryption. TLS is widely used in HTTPS.
- IPSec: Secures IP traffic, mainly used in VPNs for encrypted tunnels.
- SSH: Secure Shell protocol for secure remote login and file transfers.
- SFTP: Secure file transfer protocol using SSH.
- WPA3: Wi-Fi Protected Access protocol for securing wireless networks.
🔹 Firewalls & Network Security
Understood how stateful firewalls track active connections and how stateless firewalls inspect packets individually. Learned about configuring ACLs, DMZs for isolating public-facing services, and NAT for IP address masking. Also studied IDS/IPS for threat detection and prevention.
🔹 Security Operations Center (SOC)
Learned how a SOC monitors and manages security posture using tools like SIEM (Security Information and Event Management). Understood the use of SOAR for automating incident response, and endpoint security solutions like EDR/XDR for managing threats on devices.
🔹 Threat Hunting & Threat Intelligence
Studied proactive threat hunting strategies — using indicators of compromise (IoCs), behavior analytics, and threat intelligence feeds. Learned how organizations gather and analyze threat data to understand attacker TTPs (Tactics, Techniques, Procedures) and prepare defenses accordingly.
🔹 Host Security
- Anti-virus and anti-malware solutions
- Regular patching to fix vulnerabilities
- Host-based firewalls and secure configurations
- OS hardening to remove unnecessary services and enforce strict permissions
🔹 Identity and Access Management (IAM)
- MFA (Multi-Factor Authentication): Adds additional verification steps to improve login security.
- SSO (Single Sign-On): One login grants access to multiple systems.
- RBAC: Access based on user roles.
- ABAC: Access based on attributes like department or or sensitivity of information.
- LBAC: Access based on location .
- Emphasized the Principle of Least Privilege and Separation of Duties to reduce risk.
🔹 AAA – Authentication, Authorization, Accounting
- Authentication: Verifying identity (e.g., username & password, biometrics).
- Authorization: Granting permissions based on identity (e.g., admin rights).
- Accounting: Logging actions (e.g., login attempts, file access) for auditing.
🔹 Mobile Device Security
Learned about MDM (Mobile Device Management) tools for enforcing security policies. Topics included encryption, remote wipe, app whitelisting, and handling BYOD (Bring Your Own Device) risks with secure containers and user awareness.
🔹 Incident Response & Digital Forensics
Studied the full Incident Response (IR) lifecycle: Preparation → Detection → Containment → Eradication → Recovery. Learned forensic steps for evidence preservation: identification, collection, analysis, and documentation. Understood the importance of maintaining chain of custody for legal admissibility.
🔹 Cryptography
- Symmetric Encryption (AES): Uses one shared key for encryption and decryption. Fast and efficient for large data.
- Asymmetric Encryption (RSA): Uses public and private key pairs. Suitable for secure key exchange and digital signatures.
- Hashing Algorithms (SHA-2, MD5): Provide data integrity by creating fixed-length representations.
- Digital Signatures: Ensure data authenticity and integrity. Common in secure emails and documents.
- PKI (Public Key Infrastructure): Framework for managing digital certificates and public keys.
- TLS/SSL Handshake: A multi-step negotiation process to establish secure communication between a client and server using certificates and encryption keys.
🔚 Final Thoughts: Was It Worth It?
After completing the full CompTIA Security+ course on LinkedIn Learning (37 hours), I can confidently say it was absolutely worth it for anyone looking to build a solid foundation in cybersecurity.
The course covers a wide spectrum of essential topics—from understanding basic networking and threats to learning real-world concepts like incident response, cryptography, and security operations.
Even though it doesn’t offer a certification like the official CompTIA Security+ exam, the knowledge and clarity I gained were invaluable. The content was well-structured, beginner-friendly, and practical enough to help me grasp the real-world applications of cybersecurity concepts.
If you're someone looking to start your journey in cybersecurity, I highly recommend this course. It's an excellent way to get exposure to key domains and terminology used in the industry—before diving into more advanced certifications or practical labs.
Bottom Line: Great investment of time for beginners. Solid theoretical grounding, clear explanations
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