--- title: "sreekrishna (@sree-krishna) | Hashnode" description: "sreekrishna (@sree-krishna) writes on Hashnode. Read their latest articles and follow their work." url: "https://hashnode.com/@sree-krishna" --- @sree-krishna # sreekrishna @sree-krishna · Joined May 2025 ### [HackOps Bootcamp: - NMAP](https://task5sree.hashnode.dev/hackops-bootcamp-nmap?utm_source=hashnode&utm_medium=feed) Introduction to Further Nmap I recently completed the Further Nmap room on TryHackMe, and it was an excellent deep dive into more advanced Nmap techniques. For those unfamiliar, Nmap is the most popular network scanning tool used by cybersecurity pro... 3 min read · [task5sree.hashnode.dev](https://task5sree.hashnode.dev/hackops-bootcamp-nmap?utm_source=hashnode&utm_medium=feed) [Jun 16, 2025](https://hashnode.com/posts/hackops-bootcamp-nmap/68508530e73e348c25b6a7c9) ### [Penetration Testing Fundamentals](https://sreekrishnastask4.hashnode.dev/penetration-testing-fundamentals?utm_source=hashnode&utm_medium=feed) Authorized simulated cyberattacks to find and fix security vulnerabilities before hackers exploit them. Key Concepts White Hat vs Black Hat: Ethical (legal) vs malicious (illegal) hacking Authorization: Always get permission first Methodology: Str... 6 min read · [sreekrishnastask4.hashnode.dev](https://sreekrishnastask4.hashnode.dev/penetration-testing-fundamentals?utm_source=hashnode&utm_medium=feed) [Jun 5, 2025](https://hashnode.com/posts/penetration-testing-fundamentals/6841470044bca2234841c215) ### [Networking fundamentals](https://task3sree.hashnode.dev/networking-fundamentals?utm_source=hashnode&utm_medium=feed) Task - 1: introductory networking: 🔹 Key Topics Covered in the Room IP Addresses & How They Work IPv4 vs. IPv6 – Why the world is slowly shifting to IPv6 (more addresses!). Public vs. Private IPs – How your home router uses NAT to share one publi... 5 min read · [task3sree.hashnode.dev](https://task3sree.hashnode.dev/networking-fundamentals?utm_source=hashnode&utm_medium=feed) [Jun 5, 2025](https://hashnode.com/posts/networking-fundamentals/68414605e785abe072da48c4)