Articles That Might Interest:

Cisco Routers

How to Restrict Cisco IOS Router VPN Client to La…

In our article Cisco VPN Client Configuration - Setup for IOS Router we explained how to setup up a Cisco IOS router to support Cisco IPSec VPN clients, allowing remote users to securely connec…

Cisco Routers

Disabling Cisco Router Password Recovery Service

Most Cisco engineers are aware of the classic Password-Recovery service Cisco equipment have. If the device's credentials are lost, then performing the Password-Recovery procedure will effectively pr…

Palo Alto Networks

How to Manually Download, Import & Install PAN-OS…

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…

Ethernet Protocol, CSMA/CD, Collisions

Integrating Fast Ethernet into 10MB Ethernet Netw…

Now that Fast Ethernet is here, the question becomes, "How do I start using it ?" Integrating Fast Ethernet into existing networks need not be done all at once. Here are some aspects of 100Mbps impl…

Network Fundamentals

The Importance of a Network Analyzer – Packet Sni…

Network Analyzers, also known as Packet Sniffers, are amongst the most popular network tools found inside any Network Engineer’s toolkit. A Network Analyzer allows users to capture network packets as…

TCP - UDP Protocol Analysis

TCP Header Anaylsis - Section 5: TCP Window Size…

Our fifth section contains some very interesting fields that are used by the TCP transport protocol. We see how TCP helps control how much data is transferred per segment, make sure there are no erro…

Cisco Switches

Resolving Cisco Switch & Router ‘DHCP Server Pool…

In previous articles, we showed how it is possible to configure a Cisco router or Catalyst switch to provide DHCP server services to network clients. Everything usually works without a problem, howev…

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…

Web Application Vulnerability Scanners

Protecting Your Cookies from Cross Site Scripting…

Understanding XSS Vulnerability Attacks This article aims to help you understand how Cross Site Scripting (XSS) attacks work. Cross Site Scripting or XSS can happen in many ways. For example, a…

Ethernet Protocol, CSMA/CD, Collisions

The IEEE 802.3 SNAP Frame Format

While the original 802.3 specification worked well, the IEEE realized that some upper layer protocols required an Ethertype to work properly. For example, TCP/IP uses the Ethertype to differentiate b…

Cisco CallManager-CCME

Cisco Unity Express Installation/Setup - Service…

Mentioned in Part-1 of our Cisco Unity Express installation article, the Cisco Unity Express setup procedure is identical for ISM-SRE-300-K9 and SM-SRE-700-K9 modules. We will be using the smaller IS…

Windows Workstations (XP, 7, 8, 10, 11)

Installing The ‘Unsupported’ Profilic USB-to-Seri…

Thanks to the absence of dedicated serial ports on today’s laptops and ultrabooks, USB-to-Serial adapters are very popular amongst Cisco engineers as they are used to perform the initial configuratio…