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Cisco Routers
GRE Tunnels are very common amongst VPN implementations thanks to their simplicity and ease of configuration. With broadcasting and multicasting support, as opposed to pure IPSec VPNs, they tend to b…
Netflow
This article will cover the basics of Netflow, including its use cases, Netflow supported devices, Netflow history, and variants. We’ll also dive into the technical details of how the Netflow protoco…
Cisco CallManager-CCME
This article introduces basic CallManager Express (CCME) concepts by covering how a CCME router operates, how calls are setup between Cisco IP phones but also the role of a CCME router in this proces…
Cisco Wireless
Our previous article introduced Cisco’s popular Wireless ControllerCisco’s popular Wireless Controller (WLC) devices and examined their benefits to enterprise networks, different models offered and f…
Cisco Switches
Many companies are seeking for Cisco SFP alternatives to help cut down the costs on these expensive modules. A frequent customer problem with Cisco's new line of Catalyst switches is that they do no…
Linux - Unix
What exactly is a firewall? As in the non-computer world, a firewall acts as a physical barrier to prevent fires from spreading. In the computer world too, the firewall acts in a similar manner, only…
Windows Servers
System Center Virtual Machine Manager (SCVMM) provides some great automation benefits for those organizations that can afford the hefty price tag. However, if SCVMM isn’t a cost effective solution fo…
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 OSI model is recommended, plus understanding of h…
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 having multiple separate physical networks wit…
Windows Servers
When you shadow copy a disk volume, you are actually generating a snapshot of the changes made to the folders and files within the disk volume at a certain point in time. Windows 2012 R2 shadow copy…
Cisco Routers
Introduction Let's see what it looks like to be in User-Exec mode on a Cisco router. Below, we have telneted into our lab router and are in User Exec Mode: The easiest way to keep track of the mo…
Cisco Routers
The DNS protocol is used to resolve FQDN (Fully Qualified Domain Names) to IP addresses around the world. This allows us to successfully find and connect to Internet websites and services no matter w…

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