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OpManager - Network Monitoring & Management
Defending your client's network from faulty configuration changes, poor compliance, and bringing the network back quickly from downtime can be challenging. It requires a lot of effort and time, a fai…
Cisco Firewalls
In late 2014, Cisco announced the new licensing model for the latest AnyConnect Secure Mobility client v4.x. With this new version, Cisco introduced a number of new features, but also simplified the…
Ethernet Protocol, CSMA/CD, Collisions
Here we see a logical drawing of the Fast Ethernet Data Link Layer sublayers. Data is passed down from the upper layers (such as TCP/IP or Novell Netware) to the LLC sublayer. From there it is passed…
Network Fundamentals
Network Analyzers, also known as Packet Sniffers, are amongst the most popular network tools found inside any Network Engineer’s toolkit. A Network Analyzer allows users to capture network packets as…
Linux - Unix
Vsftpd is a popular FTP server for Unix/Linux systems. For thoes unaware of the vsftpd ftp server, note that this is not just another ftp server, but a mature product that has been around for over 12…
Routing
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 you needed was the IP Address of the machine you…
Windows Workstations (XP, 7, 8, 10, 11)
This article explains how the Windows operating system makes use of the popular Host file, where it is located for various operating systems, how it can be used to manipulate DNS lookups and redirect…
Cisco CallManager-CCME
This article explains how to reset your Cisco 7940, 7941, 7942, 7960, 7961, 7962 & 7920 IP phone to factory defaults, and how to upgrade its firmware to the latest available version. When initia…
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…
Cisco Routers
What is Policy-Based Routing? Policy-Based Routing (PBR) is a very popular feature in Cisco routers, it allows the creation of policies that can selectively alter the path  that packets take wi…
OpManager - Network Monitoring & Management
In the rapidly evolving landscape of cyber threats, network security has never been more crucial. With the frequency and sophistication of cyberattacks escalating, organizations are under constant pr…
SASE & SD-WAN Networks
The Wide Area Network (WAN) is the backbone of the business. It ties together the remote locations, headquarters and data centers into an integrated network. Yet, the role of the WAN has evolved in r…

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