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Cisco Switches

Cisco 4507R+E Layer 3 Installation: Redundant WS-…

It's no news that we here at Firewall.cx enjoy writing about our installations of Cisco equipment and especially devices that we don’t get to see and play with every day. Today we cover the installat…

Cisco Wireless

Understanding, Configuring & Tweaking Web-based C…

Cisco Aironet Access Points, just like most Cisco devices, provide a web interface from which we are able to configure the device. It is often we are presented with a number of options and settings…

Routing

OSPF - Part 3: OSPF Adjacency & Neighbor Forming…

This is the thrid article of our 6-part OSPF series (see below) that describes how OSPF routers perform neighbor relationship and adjacency. We’ll examine how OSPF discovers neighbors by sending Hell…

Palo Alto Networks

The Benefits of Palo Alto Networks Firewall Singl…

What makes Palo Alto Networks Next-Generation Firewall (NGFW) so different from its competitors is its Platform, Process and Architecture. Palo Alto Networks delivers all the next generation firewall…

Cisco CallManager-CCME

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…

VLAN Networks

VLANs - IEEE 802.1q Trunk Link Protocol Analysis

While the VLAN Tagging article briefly covered the IEEE 802.1q protocol this article will continue building upon it by further analyzing the IEEE 802.1q Trunk Link Protocol. The IEEE 802.1q tagging m…

Cisco Switches

DHCP Option 82 Message Format, Analysis. DHCP Sno…

This article provides in-depth analysis of DHCP Option 82 (DHCP Relay Agent) which is one of the +180 DHCP Options available to the DHCP protocol and used by the Bootstrap Protocol (BOOTP) used for a…

Web Application Vulnerability Scanners

How to Test for SQL Injection Attacks & Vulnerabi…

SQL injection vulnerabilities have held the first spot on the OWASP Top 10 list for quite some time. This is due to the fact that they are both still widespread and can lead to very serious consequen…

The OSI Model

Data Encapsulation & Decapsulation in the OSI Mod…

Here we are going to explain in detail how data travels through the OSI model. You must keep in mind that the OSI model is a guideline. It tells the computer what it's supposed to do when data needs…

Network Cabling

Unshielded Twisted Pair (UTP) - CAT 1 to CAT5, 5e…

Unshielded Twisted Pair (UTP) cable is most certainly by far the most popular cable around the world. UTP cable is used not only for networking but also for the traditional telephone (UTP-Cat 1). The…

TCP - UDP Protocol Analysis

TCP Header Anaylsis - Section 3: TCP Header Lengt…

The third field under close examination is the TCP Header length. There really isn't that much to say about the Header length other than to explain what it represents and how to interpret its values…

Cisco CallManager-CCME

Cisco SPA525G / SPA525G2 User Guide Free Download

Available as a free download in our Cisco Small Business Series Product Datasheet section is the Cisco SPA525G / SPA525G2 User Guide. This 68 page user guide contains all the necessary information on…