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Network Fundamentals

LAN Network Topologies

Network topologies can take a bit of time to understand when you're all new to this kind of cool stuff, but it's very important to fully understand...
Subnetting

IP Subnetting - Part 2: Subnet Masks & Their Ef...

There are a few different ways to approach subnetting and it can get confusing because of the complexity of some subnets and the flexibility they o...
Ethernet Protocol, CSMA/CD, Collisions

Troubleshooting techniques for Fast Ethernet

This page will primarily discuss problems unique to Fast Ethernet. The Collision Domain Incompatible Ethernet Jabber Auto-negotiation Prioriti...
Network Fundamentals

Introduction to Content Switching - Application...

Content switches (also sometimes called application switches) is a class of network device that is becoming increasingly common in medium to large ...

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Netflow Articles:

Netflow vs SNMP. Two Different Approaches to Ne...

SNMP (Simple Network Management Protocol) and Netflow are both popular protocols with admins, prized for their ability to give visibility over the ...

Netflow: Monitor Bandwidth & Network Utilizatio...

Monitoring network traffic & bandwidth usage via Netflow is mandatory for any type and size network. Gaining visibility into user traffic, appl...

Complete Guide to Netflow: How Netflow & its Co...

This article will cover the basics of Netflow, including its use cases, Netflow supported devices, Netflow history, and variants. We’ll also dive i...

NetFlow Analyzer: Free Download, Step-by-Step I...

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

VLAN Security - Making the Most of VLANs

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

Static VLANs

VLANs are usually created by the network administrator, assigning each port of every switch to a VLAN. Depending on the network infrastructure and secur...
VLAN Networks

VLANs - Access & Trunk Links

If you've read our previous article The VLAN Concept - Introduction to VLANs  then you should feel comfortable with terms such as 'VLAN', 'Sta...
VLAN Networks

VTP Introduction & Modes

The invention of VLANs was very much welcomed by all engineers and administrators, allowing them to extend, redesign and segment their existing network ...

Routing

Introduction to Routing Protocols

Distance Vector, Link State RIP, IGRP, EIGRP, OSPF Routing protocols were created for routers. These protocols have been designed to allow the exchan...
Routing

Distance Vector Routing Protocols

Distance Vector routing protocols use frequent broadcasts (255.255.255.255 or FF:FF:FF:FF) of their entire routing table every 30 sec. on all their inte...
Routing

OSPF - Part 6: OSPF LSA Types - Purpose and Function...

Our previous article explained the purpose of Link State Update (LSU) packets and examined the Link State Advertisement (LSA) information contained with...
Routing

The IP Routing Process - Step-by-Step Analysis

We are going to analyse what happens when routing occurs on a network (IP routing process). When I was new to the networking area, I thought that all yo...

Cisco Routers

Configuring NAT Overload On A Cisco Router

NAT (Network Address Translation) is a method that allows the translation (modification) of IP addresses while packets/datagrams are traversing the netw...
Cisco Routers

How To Configure Router On A Stick - 802.1q Trunk To...

Router-on-a-stick is a term frequently used to describe a setup up that consists of a router and switch connected using one Ethernet link configured as ...
Cisco Routers

How To Configure Dynamic DNS Server On A Cisco Router

Hosting your own webserver or email server would normaly require a static IP address from your ISP. This ensures that your services are always reachable...
Cisco Routers

Cisco Router Basics

This article will focus on Cisco's routers which can be found in almost any organization due to their popularity and market penetration. Cisco has a num...