🔐 Access Control Lists (ACLs): Technical Guide Welcome to the definitive guide to Access Control Lists (ACLs) — optimized for learners, revision, and interview preparation. This guide covers Stand...

Troubleshooting Steps for a Network Engineer Step 1. Identify the Problem Goal: Gather all necessary information to understand the issue clearly. Actions: Talk to the user and collect details:...

Port Security – Layer 2 Security 1. Introduction to Port Security Port Security is a Layer 2 security feature used on switches to control access to a switch port by restricting the number and typ...

🌐 Network Address Translation (NAT) – Complete Technical Notes 1. Introduction to NAT 1.1 What is NAT? NAT (Network Address Translation) modifies the source and/or destination IP address of p...

📘 Comprehensive Notes: Cisco Discovery Protocol (CDP) & Link Layer Discovery Protocol (LLDP) 1. 🔹 Introduction to Layer 2 Discovery Protocols In complex networks, maintaining accurate docu...

📘 OSPF Cost – Complete Technical Guide for Interview & Learning Purpose: This guide is designed for learners, professionals, and interviewers who want a complete and technical understanding of...

🌐 IPv6 Deep Dive: Addressing the Future of the Internet IPv6 (Internet Protocol version 6) is the modern backbone of the internet’s addressing system. This comprehensive guide explains every IPv6 ...

✅ First Hop Redundancy Protocols (FHRPs) – Technical Notes 🔹 1. What Are FHRPs? First Hop Redundancy Protocols (FHRPs) are network protocols that provide gateway redundancy for end hosts in a LAN...

📘 EIGRP Stub Routing – Notes 🔹 What is EIGRP and Why Do We Need Stub Routers? EIGRP (Enhanced Interior Gateway Routing Protocol) is like a group of routers constantly chatting and sharing direc...

🌐 OSPF Fundamentals OSPF (Open Shortest Path First) is a dynamic link-state routing protocol widely used in enterprise networks. It provides fast convergence, hierarchical network design, and scal...