An introduction to networking
The role of switches, routers and firewalls in a network
An e-learning platform purpose-built for networking
An effective approach to learning computer networking
Techniques to master subnetting
A Glossary of Networking Terms
—January 30, 2019
A computer network (also referred to as a "data network", or simply a "network") consists to a set of devices connected together in order to be able to exchange data between themselves. These devices create a network using their respective network interfaces. Some devices may use a single network interface, other devices may be connected to the network via multiple interfaces.
The type of interface(s) used by a device to connect to a network depends on the medium being used to connect. A wireless network interface is used to connect to a network over-the-air using a standard such as IEEE 802.11. There are various types of wired mediums in use today, the most common of which follows the IEEE 802.3 standard (Ethernet). Most devices that have a wired network interface will have at least one Ethernet interface.
A device that exists on a computer network may be referred to as a node. Based on the function of a node within the network, we can classify it as one of 2 types of devices:
—January 30, 2019
The previous post provided an overview of computer networks and described how data is encapsulated in multiple layers of headers in order to correctly identify its source (application, device and interface) as well as its destination (application, device and interface). In this post, we will discuss the role played by network devices such as switches, routers and firewalls in transfering data from its source to its intended destination over a network.
Let's start by revisiting the HTTP request from the previous post. The request, encapsulated in TCP, IP and Ethernet headers looks like the following:
Data Link (MAC)Layer 2
One way of categorizing network devices is by using the layer at which the device primarily operates.
—April 20, 2018
In order for online networking courses to be effective, they must be delivered on a platform that is purpose-built for the subject matter. Furthermore, in order to provide a truly comprehensive learning experience, an e-learning platform must be able to reproduce some of the most effective features of a hands-on, instructor-led classroom learning experience.
Keeping this in mind, we created an e-learning platform explicitly-designed to deliver effective computer networking training. In particular, it features the following:
—April 23, 2018
What is the best way to master computer networking? This question is asked often in online forums and may be of interest to someone seeking to embark on a career as a network engineer. In this post, we will address the question by sharing our insight on the topic.
When someone starts a journey to learn or master computer networking it is usually for one of the following reasons:
Our end-goal influences our approach to learning in a particular field of study — and the approach has a direct impact on how effectively we learn.
—October 31, 2018
Let's start with the "why" first. Why should we put in the effort to master subnetting? The answer is simple - it is essential to master subnetting if one wants to pursue a career in computer networking. Why are we writing a post on the topic? Our purpose is simply to demonstrate that subnetting is not as challenging a topic as it might sometimes seem.
The first step in simplifying everything related to subnetting is to identify the key outcomes we are aiming for:
—updated February 25, 2019
This list of networking related terms is updated on an ongoing basis. For any questions or comments on any of the terms listed here, please use the comments section at the bottom of the page.
IEEE 802.1Q is a standard that defines how traffic for multiple VLANs can be carried on a single physical ethernet link. This is accomplished by modifying the Ethernet header to include a VLAN ID tag.
To encapsulate an ethernet frame with a VLAN ID tag, a 32-bit field is added to the ethernet header before the EtherType field in the header.
The first 16 bits in the 32-bit field represent the Tag Protocol Identifier. This is set to hexadecimal 8100 (0x8100) to identify it as a VLAN tagged frame.
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