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Cisco Services & Technologies

Cisco VPN Client & Windows 8 (32bit & 64bit) - Re…

The Cisco VPN client is one of the most popular Cisco tools used by administrators, engineers and end-users to connect to their remote networks and access resources. This article shows how to fix the…

Cisco Data Center (Nexus/UCS)

NEXUS NX-OS: Useful Commands, CLI Scripting, Hint…

Whether you’re new to Cisco Nexus switches or have been working with them for years this article will show how to get around the Nexus NX-OS using smart CLI commands and parameters, create your…

VPN Services & Guides

VPN For Torrenting, P2P and File Sharing. Test An…

The word torrenting is often viewed as synonymous with pirating. It’s seen as a shady and illegal practice, used to con hard working artists out of their money. As a result, internet service provider…

Routing

Link State Routing Protocols

Link State routing protocols do not view networks in terms of adjacent routers and hop counts, but they build a comprehensive view of the overall network which fully describes the all possible routes…

Network Protocols

IPv6 Subnetting - How and Why to Subnet IPv6

In the previous tutorials, I went through the need for IPv6, and followed it up by drawing out the salient features which overcomes issues with IPv4. We took the journey of looking inside the headers…

Cisco Routers

Cisco Router Basic ISDN Configuration

Configuration of ISDN interfaces on Cisco routers are usually considered a straight-forward process, however there are some details which can cause your ISDN dialer interface to fail. This article w…

Cisco CallManager-CCME

Cisco Small Business SPA500 IP Phone Series Admin…

Firewall.cx readers can now access and freely download the Cisco Small Business Administration Guide for Cisco SPA500 series IP phones. The Administration Guide for Cisco SPA500 series IP phon…

Cisco Routers

How To Configure DHCP Server On A Cisco Router

DHCP (Dynamic Host Configuration Protocol) is the protocol used by network devices (such as PCs, network printers, etc) to automatically obtain correct network parameters so they can access network a…

VLAN Networks

Comparing Traditional Flat & VLAN Networks

Designing and building a network is not a simple job. VLANs are no exception to this rule, in fact they require a more sophisticated approach because of the variety of protocols used to maintain and…

The OSI Model

The OSI Model: Layer 1 - Physical Layer

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…

Ethernet Protocol, CSMA/CD, Collisions

Troubleshooting techniques for Fast Ethernet

This page will primarily discuss problems unique to Fast Ethernet. The Collision Domain Incompatible Ethernet Jabber Auto-negotiation Priorities And Alternatives Incompatible Cabling Specificat…

Web Application Vulnerability Scanners

Differences between Network & Web Application Sec…

According to Wikipedia, security is defined as the degree of resistance to, or protection from, harm. It applies to any vulnerable and valuable asset which in almost all cases, will include an organi…