r/learnwithcodelivly

Hey everyone,

I made a simple Nmap cheatsheet for anyone learning host discovery, port scanning, service detection, NSE scripts, output options, and common commands. I wanted to keep it clear, practical, and easy to use without unnecessary fluff.

If you want to go beyond the cheatsheet, I’m also sharing these free Nmap learning resources:

Free Room:
https://codelivly.com/rooms/nmap-fundamentals

Free Video:
https://www.youtube.com/watch?v=IMzRT_A60r4

This is useful if you’re a:

• beginner in cybersecurity
• student learning networking or pentesting
• someone revising Nmap basics
• lab/CTF learner who wants a quick reference

If you want, I can also post more simple cybersecurity cheatsheets like:

• Linux basics
• Burp Suite
• Web app testing
• Enumeration
• Privilege escalation

Would love your feedback.

You can spend another few months watching random YouTube videos, saving tutorials, and jumping between resources without knowing what to learn next.

Or you can start building your networking knowledge with a clear direction.

If you're aiming for a Network Engineer role, preparing for CCNA, or planning to move into cybersecurity, these resources can help you get started:

Computer Networking All-in-One for Dummies
Need to strengthen your fundamentals? Start here.
https://resources.codelivly.com/product/computer-networking-all-in-one-for-dummies/

Network Engineer Complete Bundle (L1, L2 & L3)
One collection covering the journey from networking foundations to advanced network architecture.
https://resources.codelivly.com/product/network-engineer-complete-bundle-l1-l2-l3-foundations-to-advanced-architecture/

Enterprise Network Penetration Testing
Already interested in cybersecurity? Learn about testing enterprise networks for security weaknesses.
https://resources.codelivly.com/product/enterprise-network-penetration-testing/

Think about it: when a networking opportunity comes along, will you be ready to explain the concepts, understand the architecture, and work through technical problems? Or will you still be trying to figure out where to begin?

Your career won't change just because you bought a book. It changes when you finally put the right knowledge to work.

Choose the resource that fits your goal, start learning, and build from there.

💬 Learning alongside others? Join the Codelivly community: https://discord.gg/adX98594jg

Ever wonder how your entire house or office gets by on a single public IP? It’s NAT, and specifically PAT (Port Address Translation). I just built this from scratch in Cisco Packet Tracer to see exactly how it works under the hood.

The Topology:

PC0 & PC1 > Switch > R1 (NAT) > R2 (ISP) > Server

What I configured:

- Interface IPs and descriptions (LAN: 192.168.10.0/24, Outside link: 203.0.113.0/30)

- Tagged interfaces: `ip nat inside` on the LAN side, `ip nat outside` on the ISP side

- Default route (`0.0.0.0/0`) pointing to the ISP router

- Standard ACL to define allowed internal hosts, tied to: `ip nat inside source list 1 interface gig0/1 overload`

- Saved it all with `copy running-config startup-config`

Verification:

- Successfully pinged the ISP server from the internal PCs.

- Ran `show ip nat translations` to watch it work. Seeing the unique port numbers map to the single public IP is where the concept really clicks.

The Takeaway:

NAT gets private addresses to the internet. PAT takes it a step further by using unique source port numbers to track each individual session, allowing hundreds of devices to share one public IP without traffic collisions.

Lab is configured, tested, and working. On to the next one.

*Note:* If you’re currently studying for your CCNA or just building your network engineering fundamentals, I’ve been working through the Network Engineer Complete Bundle (L1 to L3) from CodeLivly. It covers this exact type of architecture from the ground up without the usual textbook fluff. It’s a solid resource if you want structured, practical labs:

https://resources.codelivly.com/product/network-engineer-complete-bundle-l1-l2-l3-foundations-to-advanced-architecture/

If you’re serious about building a career in cybersecurity, watching random tutorials only gets you so far.

At Codelivly, we’re starting an 8-week Ethical Hacking & Penetration Testing Live Training program designed for people who want practical skills they can actually build on for roles like junior pentester, security analyst, web security tester, or offensive security engineer.

The training is live and hands-on. We’ll cover reconnaissance, Nmap, enumeration, vulnerability discovery, Linux and Windows privilege escalation, Burp Suite, web application testing, SQL injection, XSS, IDOR, API security, JWT testing, exploitation, and reporting.

You’ll also work through practical labs so you understand the process, not just the commands.

24 live classes · Monday / Wednesday / Friday · 4:45 PM UTC
Led by Rocky, Founder of Codelivly

If cybersecurity is the career you want to move into, this is built to give you a structured starting point and the practical foundation to keep progressing.

More details and enrolment:
https://training.codelivly.com/programs/ethical-hacking-and-penetration-testing

They fail because they don’t know what to do when the alert actually appears.

You open the SIEM.

There are dozens of alerts.

Which one matters?

What do you check first?

Is it a false positive?

Do you investigate the user, host, IP, process, or all of them?

When should you contain the threat?

When should you escalate?

That workflow is what separates someone who has watched a few SOC videos from someone who can actually work an incident.

We put together this SOC Cheat Sheet as a simple reference for the things analysts use constantly.

Alert triage, log sources, severity levels, investigation steps, response actions, IOCs, TTPs, escalation, and the full SOC workflow from detection to reporting.

But a cheat sheet is only the starting point.

If your goal is to move into cybersecurity and eventually work as a SOC Analyst, focus less on collecting random certificates and more on learning how to investigate real activity, understand logs, make decisions, and explain what happened.

That is exactly what we built into the SOC Analyst Complete L1 + L2 + L3 Bundle.

It is designed to take you from the fundamentals into deeper SOC investigation, detection, incident response, and practical analyst skills.

If SOC is the career path you are serious about, start here:

https://resources.codelivly.com/product/soc-analyst-the-complete-l1-l2-l3/

Learn the process. Practice the investigation. Build the skills employers expect.