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Subnetting
Routing and Communication between subnets is the main topic here. This article analyses communications between subnets. We provide examples on different methods that can be used to enable subnet comm…
Cisco Routers
This article serves as an extension to our popular Cisco VPN topics covered here on Firewall.cx. While we’ve covered Site to Site IPSec VPN Tunnel Between Cisco Routers (using static public IP addres…
OpManager - Network Monitoring & Management
The hybrid work culture has resulted in workforces increasingly using their mobile devices for work, further adding to the complexity of ensuring security across all endpoints within organizations…
Web Application Vulnerability Scanners
In this article, we’re going to talk about automating your web security in the safest and most effective way. We’ll also touch on a few Web Application Security automation tools worth considering…
Routing
We all understand that TCP/IP, IPX-SPX are protocols which are used in a Local Area Network (LAN) so computers can communicate between with each other and with other computers on the Internet. Chanc…
Linux - Unix
Since this document merely scratches the surface when it comes to Linux, you will probably find you have lots of questions and possibly problems. Whether these are problems with the operating system…
Cisco Data Center (Nexus/UCS)
Cisco virtual Port Channel (vPC) is a virtualization technology, launched in 2009, which allows links that are physically connected to two different Cisco Nexus Series devices to appear as a single p…
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…
Palo Alto Networks
This article provides comprehensive guidance on the manual processes involved in downloading, uploading, and installing (import) any PAN-OS version on a Palo Alto Firewall. It details the steps for s…
Windows Servers
In a Windows server environment, it is very important that only authenticated users are allowed to log in for security reasons. To fulfill this requirement the creation of User accounts and Groups is…
SASE & SD-WAN Networks
Enterprises have been successfully running WAN optimization appliances at their many distributed sites for years. The devices have done a good job of helping businesses squeeze as much capacity as po…
The OSI Model
The Physical layer has two responsibilities: it sends bits and receives bits. Bits come only in values of 1 or 0. The Physical layer communicates directly with the various types of actual communicati…

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