Day 2: Networking for security
Security incidents live on the network. Today you learn how packets move, what ports and protocols mean, and how to inspect traffic with browser tools — skills used in SOC, pentesting, and cloud security.
Today's outcome: You can read IPs, ports, DNS, and HTTP traffic enough to support security investigations.
Week progress
Day 2 of 7
- 1
Security mindset & threat basics
- 2
Networking for security
You are here
- 3
Linux command line
- 4
Web security introduction
- 5
SOC & log awareness
- 6
First hands-on lab
- 7
Pick your career direction
Goals
Learning objectives
By the end of today you should be able to:
- Explain IP addresses, subnets, and common ports (22, 80, 443, 3389)
- Describe DNS resolution and why it matters for phishing and C2
- Inspect HTTP requests and responses in browser dev tools
- Sketch a simple home or lab network with trust boundaries
Schedule
Suggested schedule
Adjust timing to your pace — aim for one focused block per day.
- Tutorial~35 min
Complete networking basics for cybersecurity (IPs, ports, DNS, HTTP).
- Practice~15 min
Use dev tools on a site you trust — note headers, cookies, and status codes.
- Map~10 min
Draw your home network: router, devices, and what could be attacked.
- Stretch~10 min
Skim network security basics tutorial for firewalls and segmentation.
Learn
Mapped learning resources
These links connect this day to tutorials, labs, roadmaps, and reference material on PentesterWorld.
Networking for cybersecurity
IPs, ports, protocols, DNS, HTTP, firewalls, and packet flow from a defender’s view.
Open resourceNetwork security basics
Extend into segmentation, VPNs, and perimeter controls.
Open resourceBeginner roadmap — networking module
Networking stage in the structured beginner path.
Open resourceConcepts
Key terms for today
Notebook
Reflection prompts
Copy these into your learning notebook — answers become portfolio material later.
- What port would SSH use? What about HTTPS?
- What hostname does DNS resolve when I visit a website?
- Where is the trust boundary on my network diagram?