Ping Labz

CCNP-level networking tutorials — OSPF, STP, 802.1X, and BGP explained with real lab configs and topology diagrams.

Configuring VLANs on Cisco Catalyst Switches

Learn how to create VLANs, assign access ports, and verify your VLAN configuration on Cisco Catalyst 9000 series switches using IOS XE 17.x.

6 min read Dec 23, 2024

Cisco public

Cisco Modeling Labs CML 2.8 is Now Free

Cisco Modeling Labs 2.8 is now free, with a tier that lets you run routers, switches, and firewalls on your laptop. Here is what it unlocks for lab work and certs.

4 min read Dec 23, 2024

Cisco public

Exploring Cisco Modeling Labs (CML) 2.8: What’s New in This Exciting Release

CML 2.8 brings a free tier, new images, and updated tooling for network simulation. Here is what is new, who benefits, and how to get the most out of the release.

3 min read Dec 23, 2024

Cisco public

Understanding Collision Domains

A collision domain is any segment where two devices can step on each other's frames. Here is what shrinks them, why switches help, and how it affects performance.

2 min read Dec 23, 2024

Cisco public

Cisco ASA Cheat Sheet: Essential Commands for Network Administrators

A working Cisco ASA cheat sheet: show version, write memory, failover, ACLs, NAT, and the troubleshooting commands you actually reach for under pressure.

2 min read Dec 23, 2024

Cisco public

What is OSPF? A Complete Guide to Open Shortest Path First Protocol

OSPF is a link-state routing protocol that builds an LSDB, runs Dijkstra, and converges fast. Here is what problem it solves, how it works, and where it fits.

5 min read Dec 23, 2024

Cisco public

Local Area Network Basics: Understanding Modern LANs

Modern LANs run on high-speed switches, PoE, structured cabling, and Wi-Fi 6/7 APs. Here is a clean walkthrough of the components and how they fit together.

1 min read Dec 23, 2024

Network+ public

Understanding IPv4: The Internet’s Original Addressing System

IPv4 gives every networked device a 32-bit address split across classes and subnets. Here is how IPv4 addressing works, why it still runs the internet, and its limits.

2 min read Dec 23, 2024

Comptia public

7 Essential OSI Model Layers: Complete Guide for Network Beginners

The OSI model's seven layers explain how data moves from application to wire. Here is each layer, the key protocols, and how to use the model for troubleshooting.

2 min read Dec 23, 2024

Comptia public

Straight-Through vs Crossover Ethernet Cables: A Clear Guide

Straight-through cables connect PC to switch or router; crossover cables connect like to like. Here is the pinout, color code, and when Auto-MDIX makes it moot.

1 min read Dec 23, 2024

Cisco public

Understanding IP Routing: A Beginner’s Guide

IP routing is how routers pick a path and forward packets between networks. Here is the routing table, next hop, and longest-prefix match in simple terms.

2 min read Dec 23, 2024

Cisco public

How to Enable SSH on Cisco Routers and Switches

Enabling SSH on a Cisco router or switch takes a hostname, domain name, RSA keys, a local user, and vty line login. Here is the full config plus verification.

3 min read Dec 23, 2024

Explore topics