Practical Networking .net

Routing Between VLANs

We wrote an article which covers Virtual Local Area Networks (VLANs) as a concept, and another article on configuring VLANs on Cisco witches. The remaining subject to cover is the different options that exist for routing between VLANs. This is also sometimes called inter-vlan routing, or occasionally Router on a Stick (RoaS). Why do we need Routing Between […]


Configuring VLANs on Cisco Switches

We’ve before written about VLANs and what they can do as a concept. This article will focus on configuring VLANs on Cisco switches. We will look at each command necessary to configure the topology below. If this topology looks familiar, it is because you saw it in the article which described how VLANs operated on […]


Virtual Local Area Networks (VLANs)

Virtual Local Area Networks, or VLANs, are a very simple concept that has been very poorly defined by the industry. This article will explain VLANs from a practical perspective. It will be framed around the two major functions of VLANs, and concluded with an explanation of the idea behind the Native VLAN. Finally, at the […]


EIGRP Feasibility Condition

EIGRP is a routing protocol whose strategy to prevent routing loops is based upon what is known as the EIGRP Feasibility Condition. EIGRP also makes use of another concept called Split Horizon, which we will also briefly touch on later in this article. To properly discuss the Feasibility Condition however, you must have an understanding […]


EIGRP Metric

The EIGRP Metric has caused confusion for many network engineers trying to understand the protocol. This article will dive into what the metric is, and how to boil it down into its simplified form. Formula and K-Values EIGRP is a Cisco Proprietary routing protocol created in the 1980s. As such, Cisco was the only vendor […]


EIGRP Terminology

Anyone who has ever studied the EIGRP protocol has at some point or another been confused by the awkwardly defined terminology that is incorporated into the protocol. This article’s purpose will disambiguate all the EIGRP terminology that causes so much confusion when trying to understand the protocol. Terms that Describe Routes From the perspective of […]


Packet Traveling – Series Finale

In this series, we studied the different layers of the OSI Model, and how each of the seven layers provides a unique service which the other layers depend on. We also studied the key players of the Internet, where we defined a Host, Client, Server, Switch, Router, and ARP. As well as each of their […]


Packet Traveling

  If you’re reading this blog, then you are no doubt already familiar with the wondrous creation that is the Internet. The Internet allows computers from all over the world to speak to each other. When data leaves your computer, it is grouped into small chunks called Packets. These packets are essentially little envelopes that carry […]