Learning in public.

How to Set Up a Secure Enterprise Network in Cisco Packet Tracer

Beginner’s Guide to Linux Server Hardening & Fail2ban

My Journey as a Cybersecurity Student at APU Malaysia

Nmap Basics: Scanning Your Own Lab Network

Host discovery, port scans and service detection, with the commands I use in my own labs.

VLANs Explained with Cisco Commands

Create VLANs, assign access ports, set up a trunk and verify it, step by step.

OSPF Single-Area Configuration in Packet Tracer

Configure OSPF, silence the LAN side, and verify neighbours and routes.

SSH Hardening Checklist for a New Linux Server

Key login, no root access, firewall and Fail2ban in a short checklist.

HSRP and EtherChannel: Redundancy Basics

A backup gateway and bundled links, so one failure does not take the network down.

How I Plan a Semester of Labs and Projects

A simple weekly system for tracking labs, deadlines and project checklists.

UFW Firewall Basics for Ubuntu

Block everything by default and open only the ports your server needs.

Linux File Permissions Explained

Read, write and execute for owner, group and others, with chmod and chown.

iptables Basics: Rules, Chains and Saving

Understand chains, add a few safe rules, and keep them after reboot.

Wireshark Packet Capture Basics

Capture traffic in your lab and use display filters to find what you need.

DHCP and DNS in Cisco Packet Tracer

Hand out addresses from a router and resolve a name in a small lab.

Cisco ACL Basics: Standard and Extended

Permit or deny traffic on a router, with rules you can read and test.

Python Socket Client and Server Example

A tiny TCP echo server and client to learn how network programs talk.

Reading Linux Logs: journalctl and auth.log

Find failed logins and service errors on your own server.

Linux Users, Groups and sudo for Beginners

Create a normal user, add it to a group and give limited admin rights.

Cisco Port Security Basics

Limit which devices can use a switch port and choose what happens on a violation.

Malware Analysis Basics: A Safe Lab Setup

Set up an isolated VM, inspect a suspicious file safely, and write a clear report.

Reverse Engineering Basics: Your First Steps

Learn what a binary is, read it with simple tools, and try your own programs first.

Malware Analysis for Beginners: A Safe Lab Setup

Analyse a suspicious file in an isolated VM, collect indicators and write a clear report.

Reverse Engineering Basics on Linux

Read a compiled program with file, strings, objdump, ltrace and gdb, using your own practice file.