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Understanding MAC Addresses and Frames

Before we dive into VLANs, routers, IP addresses and all that stuff, we have to understand how a network works, and which language a switch speaks. A MAC address (Media Access Control address) is a… 

Determine Speed with Bits and Bytes

A bit is the smallest unit of data. Just a 0 or a 1. That’s a bit. A byte is 8 bits grouped together and that is where data starts becoming more human-friendly. So the… 

Switching & Wireless

A switch is a silent worker. It sits in the rack connects wired devices with each other and just works. Now lets talk about the Aps (Access Points). At the end of the day they… 

Router & Firewall

To explain the difference between those two devices, especially in our time is not always easy to answer. A router can do some security work and a firewall can do some routing work. But if… 

Client & Servers

In networking terms a client is a device asking for something and a server is the device providing something. If you search for www.lenherr.ai and send this request, your computer is the client, because it’s… 

Staging the network equipment

In a real-world scenario, you almost never want to buy new hardware, travel with that hardware to your customer and open the boxes there in hope you have a genius idea, which makes all the… 

LAN vs. WAN

LAN (Local Area Network) is like the networking inside of your building. In this course it represents the network in our coffee shop. If devices are talking with the office PC, the TV, the WiFi… 

Networking – General questions

What is a network? To make it as simple as it can be: One computer wants to talk to another computer. This is the heartbeat of all this. OF course it gets way more complex… 

Create a stretched cluster with Azure

To simulate a working streched cluster in Azure we need at least these resources: Firstly we create two resource groups in different regions. In my case I chose to put one resource group in the…