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Cisco CallManager-CCME
Most engineers are aware that to download and install the latest Cisco CallManager Express (CCME) Graphical User Interface (GUI) files, Cisco requires a registered CCO account with the necessary priv…
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…
Network Cabling
This article covers the popular serial ports on workstations, servers and laptop computers. We cover serial data transfer, port pinouts, port speeds, serial interface types (DB9 & DB25), null mod…
Linux - Unix
What is Server Virtualization? Server virtualization is the process of apportioning a physical server into several smaller virtual servers. During server virtualization, the resources of the ser…
Cisco Firewalls
This article examines the concept of NAT Reflection, also known as NAT Loopback or Hairpinning, and shows how to configure a Cisco ASA Firewall running ASA version 8.2 and earlier plus ASA version 8…
Network Fundamentals
Network hubs were once the primary method of interconnecting network devices to create a local area network (LAN). Hubs were inexpensive, easy to install, and provided a simple means of connecting mu…
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 Network (LAN) we once knew starts to take a diffe…
Routing
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 interfaces in order to communicate with their neigh…
Domain Name System (DNS)
This section will help you understand how the DNS queries work on the Internet and your home network. There are two ways to use the domain name system in order to resolve a host or domain name to an…
Web Application Vulnerability Scanners
This article examines the differences between logical and technical web application vulnerabilities which tends to be a very confusing topic especially for web application developers and security – p…
Cisco Switches
This article covers popular Layer 2 & Layer 3 network attacks with a focus on DHCP Starvation Attacks, Man-in-the-Middle attacks, unintentional rogue DHCP servers and explains how security featur…
Web Application Vulnerability Scanners
With nearly every business sector relying on the internet and digital tools to function, it is no surprise that cybersecurity is the second-fastest growing industry. Hackers don’t care how large or s…

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