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Cisco Routers
Generic Routing Encapsulation (GRE) is a tunneling protocol developed by Cisco that allows the encapsulation of a wide variety of network layer protocols inside point-to-point links. A GRE tunnel is…
Network Fundamentals
Network data transmission refers to the process of sending and receiving information between two or more devices connected to a network. It is a critical aspect of modern-day networking, and it enabl…
Web Application Vulnerability Scanners
Since 2011 Web Application Vulnerability scanners scanned 396 open source web applications. The scanners identified 269 vulnerabilities and a popular web vulnerability scanner published 114 advisorie…
Linux - Unix
For a cable modem or a DSL connection, the service provider dynamically assigns the IP address to your PC. When you install a DSL or a home cable router between your home network and your modem, your…
Cisco Firewalls
This article will show how to download and upload the newer AnyConnect 4.x VPN clients to your Cisco ASA Firewall appliance (5500 & 5500-X Series) and configure WebVPN so that the newer AnyConnec…
Ethernet Protocol, CSMA/CD, Collisions
You may know that the minimum frame size in an Ethernet network is 64 bytes or 512 bits, including the 32 bit CRC. You may also know that the maximum length of an Ethernet cable segment is 500 meters…
ICMP Protocol
The ICMP - Redirect Message is always sent from a gateway to the host and the example below will illustrate when this is used. Putting it simply (before we have a look at the example) the ICMP - Red…
TCP - UDP Protocol Analysis
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 Routers
Our Web SSL VPN article written back in 2011 introduced this new wave of VPN services.  This article extends the topic by covering the installation and configuration of Cisco’s SSL AnyConnect VP…
OpManager - Network Monitoring & Management
Accurately monitoring your organization’s business application performance, service provider SLA breaches, network infrastructure traffic, bandwidth availability, Wi-Fi capacity, packet loss, delay…
Windows Servers
A Windows Active Directory Certification Authority server (AD CA), also known as a Certificate Authority, is an essential service to every organization’s Active Directory as it can manage, issue, rev…
Routing
Hybrid routing protocols are a combination of distance-vector and link-state routing protocols, and are used to provide a more efficient and scalable routing solution in larger networks. These…

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