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Network Fundamentals
Unicast is a communication method used in computer networking where data is sent from a single sender to a specific destination device. In th...
Ethernet Protocol, CSMA/CD, Collisions
The following is a description of the Ethernet Frame Format described in the IEEE 802.3 Specification. The 802.3 Specification defines a 14 byte Da...
Ethernet Protocol, CSMA/CD, Collisions
In this article we will analyze the following aspects of upgrading/migrating from 10Mbit Ethernet to 100Mbit Ethernet. Cabling Incompatible Imp...
TCP - UDP Protocol Analysis
Understanding how each protocol fits into the OSI Model is essential for any network engineer. This page analyses how TCP is classified as a 'trans...

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Netflow Articles:

SNMP (Simple Network Management Protocol) and Netflow are both popular protocols with admins, prized for their ability to give visibility over the ...
This article will cover the basics of Netflow, including its use cases, Netflow supported devices, Netflow history, and variants. We’ll also dive i...
Monitoring network traffic & bandwidth usage via Netflow is mandatory for any type and size network. Gaining visibility into user traffic, appl...
In our previous article we explained how a Netflow Analyzer can help you gain visibility into your user traffic, application traffic and data flows...

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VLAN Networks
We mentioned that Trunk Links are designed to pass frames (packets) from all VLANs, allowing us to connect multiple switches together and independently ...
VLAN Networks
The previous article introduced the VTP protocol, we examined how it can be used within a network, to help manage VLANs and ease the administrative over...
VLAN Networks
It's easy to see why virtual LANs have become extremely popular on networks of all sizes. In practical terms, multiple VLANs are pretty much the same as...
VLAN Networks
We hear about them everywhere, vendors around the world are constantly trying to push them into every type of network and as a result, the Local Area Ne...

Routing
Our previous article explained the purpose of Link State Update (LSU) packets and examined the Link State Advertisement (LSA) information contained with...
Routing
We all understand that TCP/IP, IPX-SPX are protocols which are used in a Local Area Network (LAN) so computers can communicate between with each other a...
Routing
Distance Vector, Link State RIP, IGRP, EIGRP, OSPF Routing protocols were created for routers. These protocols have been designed to allow the exchan...
Routing
This article covers basic OSPF concepts and operation. We explain how OSPF works, how OSPF tables are built on an OSPF-enabled router and their purpose ...

Cisco Routers
Welcome to the Routers section. Here we will analyse routers quite some depth; what they do and how they work. We must point out that knowlege on the OS...
Cisco Routers
This article provides an in-depth explanation of PPP Multilink and shows how to configure a Cisco router to use PPP Multilink between two serial interfa...
Cisco Routers
This article shows how to configure the embedded or integrated access point in a Cisco 880W series router (e.g Cisco 887W, Cisco 886W, Cisco 881W, Cisco...
Cisco Switches
This article focuses on VLAN Security and its implementation within the business network environment. We provide tips and Cisco CLI commands that will h...