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VLAN Networks
If you've read our previous article The VLAN Concept - Introduction to VLANs  then you should feel comfortable with terms such as 'VLAN', 'Static & Dynamic VLANs', however this is just…
Cisco Switches
The Supervisor Engine is the heart of the Cisco Catalyst 4500 and 6500 series switches. It is the equivalent of an engine in a car. Every packet that enters or exits your switch passes through the Su…
Linux - Unix
So far we have covered in great detail the main files required for the firewall.cx domain. These files, which we named db.firewall.cx and db.192.168.0, define all the resouce records and hosts availa…
VPN Services & Guides
Is Guest WiFi Safe? It’s hard to go to a pub, café, or hotel these days without running into public or guest WiFi. In many cases, an internet connection can feel like a necessity – keeping up with w…
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…
Palo Alto Networks
This article will show you how to configure an IPSec VPN tunnel between a Palo Alto firewall (all PANOS versions) and Meraki MX security appliance. Our comprehensive guide includes IPSec VPN setup fo…
Web Application Vulnerability Scanners
SQL Injection Attacks are one of the most popular attacks against web servers, websites and web applications. A fairly popular website can expect to receive anywhere between 80 and 250 SQL injection…
Network Protocols
Our previous article was an Introduction To The ISDN Protocol. This article dives a bit deeper by examining ISDN Layers, Protocols & Components. ISDN uses circuit-switching to establish a physic…
Windows Servers
The Domain Name System (DNS) is perhaps one of the most important services for Active Directory. DNS provides name resolution services for Active Directory, resolving hostnames, URLs and Fully Qualif…
Cisco Data Center (Nexus/UCS)
The Cisco NX-OS checkpoint feature provides the capability to capture at any time a snapshot (backup) of the Cisco Nexus configuration before making any changes. The captured configura…
Ethernet Protocol, CSMA/CD, Collisions
In this article we will analyze the following aspects of upgrading/migrating from 10Mbit Ethernet to 100Mbit Ethernet. Cabling Incompatible Implementations Repeaters In Fast Ethernet Replacemen…
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…

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