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Power over Ethernet - Understanding PoE Technolog…
Power over Ethernet (PoE) was invented by PowerDsine back in 1997 and the first power injector (Midspan) was installed in 1998! Many manufacturespartnered with PowerDsine to make useof this innovatio…
Introduction to Cisco VIRL – Virtual Internet Rou…
One of the most difficult things for people who are starting out in a networking career is getting their hands on the equipment. Whether you are studying for Cisco certification or just wanting to te…
Free Cisco IP Phone & ATA Firmware (SCCP & SIP)…
Firewall.cx readers can now download free Cisco firmware files for all Cisco IP Phones & Cisco ATA devices. Our new Cisco IP Phone & ATA Firmware Download section contains the latest SCCP (Sk…
100Base-(T) TX/T4/FX - Ethernet
The 100Base-TX (sometimes referred to 100Base-T) cable was until 2010 perhaps the most popular cable around since it has actually replaced the older 10Base-T and 10Base-2 (Coaxial). The 100Base-TX ca…
Network Management Systems Help Businesses Accura…
Accurately monitoring your organization’s business application performance, service provider SLA breaches, network infrastructure traffic, bandwidth availability, Wi-Fi capacity, packet loss, delay…
Creating Windows Users and Groups with Windows 20…
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…
Cisco CallManager Express Basic Concepts - Part 2
Our previous article, Cisco CallManager Express Basic Concepts - Part 1 covered the very basic concepts of CCME and its operation. This article continues with the Cisco CallManager Express basic conc…
802.3 Fast Ethernet (100 Mbit/Sec) Model
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…
CallManager Express Setup for IP Phone Firmware U…
This article will show how to configure CallManager Express (CME) for the IP phone firmware upgrade process. Upgrading your Cisco IP phones is generally a good practice, especially when upgrading you…
Achieving Modern Compliance: Navigate PCI DSS v4…
In an era where cyber threats are growing in both volume and sophistication, failing to meet security compliance standards is no longer just a legal issue—it’s a business risk with potentially catast…
Understanding VPN IPSec Tunnel Mode and IPSec Tra…
IPSec’s protocol objective is to provide security services for IP packets such as encrypting sensitive data, authentication, protection against replay and data confidentiality.
As outlined in our IP…
Palo Alto Firewall Configuration Options. Tap Mod…
Our previous article explained how Palo Alto Firewalls make use of Security Zones to process and enforce security policies. This article will explain the different configuration options for physical…
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