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Cisco Routers

Configuring Site to Site IPSec VPN Tunnel Betwe...

Site-to-Site IPSec VPN Tunnels are used to allow the secure transmission of data, voice and video between two sites (e.g offices or branches). The VPN tunnel is created over the Internet public net...

Cisco Routers

Configuring PPTP (VPDN) Server On A Cisco Router

The Point to Point Tunneling Protocol (PPTP) is a network protocol used to create VPN tunnels between public networks. These VPN tunnels are encrypted from one end to the other and allow the secure...

Windows Servers

Free Webinar: Scripting & Automation in Hyper-V...

System Center Virtual Machine Manager (SCVMM) provides some great automation benefits for those organizations that can afford the hefty price tag. However, if SCVMM isn’t a cost effective solution ...

Routing

OSPF - Part 5: Analysis of OSPF Link State Upda...

This article explains how OSPF uses Link State Advertisement (LSA) to exchange information about the network topology between routers. When a router receives an LSA, it is stored in the Link-State ...

Cisco Routers

Cisco Router 'User Exec' Mode

Introduction Let's see what it looks like to be in User-Exec mode on a Cisco router. Below, we have telneted into our lab router and are in User Exec Mode: The easiest way to keep track of the ...

Palo Alto Networks

Complete Guide: Configuring IPSec VPN between P...

This article will show you how to configure an IPSec VPN tunnel between a Palo Alto firewall (all PANOS versions) and Meraki MX security appliance. Our comprehensive guide includes IPSec VPN setup ...

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...

Cisco Routers

How To Configure ISDN Internet Dialup On A Cisc...

Some time ago, when broadband and ADSL wasn't available, analog and digital (ISDN) modems were the only way to connect to the Internet. Even though today ISDN isn't used much for Internet connectiv...

Web Application Vulnerability Scanners

Acunetix Enterprise: Find Website - Web Applica...

Security researchers disagree about the percentage of vulnerable websites, but most concur that it’s way too high. Despite their long history, attackers continue to use cross-site scripting (XSS), ...

Cisco Data Center (Nexus/UCS)

Nexus 7000/7700 Software Upgrade via ISSU. Comp...

This article shows how to perform an ISSU (In-Service Software Upgrade) on a Nexus Data Center switch (7000 and 7700 models) and avoid service and network disruption. We explain the importance of k...

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 ...

Network Cabling

Serial Direct Cable Connection, DB9, DB25, COM ...

This article covers the popular serial ports on workstations, servers and laptop computers. We cover serial data transfer, port pinouts, port speeds, serial interface types (DB9 & DB25), null m...