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Cisco CallManager-CCME
Cisco's CallManager Express GUI interface is an important part of the CallManager Express product as it provides the ability to administer CME via a web browser. Generally, the CME GUI interface is e…
SASE & SD-WAN Networks
With so much enterprise network traffic now destined for the cloud, backhauling traffic across an expensive MPLS connection to a data center to apply security policy no longer makes sense. Software-d…
Network Fundamentals
The first step in controlling broadcast and multicast traffic is to identify which devices are involved in a broadcast or multicast storm. The following protocols can send broadcast or multicast pack…
Windows Servers
NIC Teaming, also known as Windows Load Balancing or Failover (LBFO), is an extremely useful feature supported by Windows Server 2012 that allows the aggregation of multiple network interface cards t…
Cisco Routers
In today’s complex network environments securing your network routers can be a daunting task, especially when there are so many CLI commands and parameters with different security implications for yo…
TCP - UDP Protocol Analysis
This article is an introduction to the 7-page TCP Header analysis section that follows. We briefly view each section of the TCP Header and then move on to its analysis using detailed colourful diagra…
Cisco Routers
Our Web SSL VPN article written back in 2011 introduced this new wave of VPN services.  This article extends the topic by covering the installation and configuration of Cisco’s SSL AnyConnect VP…
Cisco Switches
This article explains the procedure that should be followed to correctly shutdown/powerdown a Cisco Nexus 7000 series module and remove it from the chassis. We also include important tips that will h…
Network Fundamentals
A long-long time ago (not long ago in earth time) 100 Mbps was THE technology. 100 Mbps uplinks bundled with ether-channel was the ultimate uplink technology. This was the prevailing technology durin…
Network Fundamentals
A Denial of Service (DoS) attack is a malicious attempt to disrupt the normal functioning of a website, server or network by flooding it with traffic or overloading its resources. The aim of such an…
Subnetting
So we have covered to some depth the subnetting topic, but there is still much to learn ! We are going to explain here the available subnet masks and analyse a Class C network, using a specific subne…
Linux - Unix
Setting up a Secondary (or Slave) DNS sever is much easier than you might think. All the hard work is done when you setup the Master DNS server by creating your database zone files and configuring th…

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