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Cisco Routers
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 t…
Cisco Services & Technologies
Dynamic Multipoint VPN (DMVPN) is Cisco’s answer to the increasing demands of enterprise companies to be able to connect branch offices with head offices and between each other while keeping costs lo…
Palo Alto Networks
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…
Web Application Vulnerability Scanners
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), SQ…
Cisco CallManager-CCME
This article will show how to configure CallManager Express (CME) for the IP phone firmware upgrade process. Upgrading your Cisco IP phones is generally a good practice, especially when upgrading you…
Cisco Services & Technologies
Fifteen years ago Virtual Private Networks (VPN) access was a fairly new concept to most businesses. While large corporations already had a good head-start with VPN technologies, the rest were starti…
Network Address Translation - NAT
The previous page (Static NAT - Part 1) helped us understand what exactly happens with Static NAT and how it works, and we saw a few examples of how to use it in various network configurations. This…
Cisco Routers
One of the greatest perhaps features of Cisco routers is that most commands used in the IOS software they run on, are identical across multiple platforms. For example, commands for configuring a giga…
Network Fundamentals
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…
IP Protocol
This article examines the Internet Protocol (IP) and its position within the OSI Model. We take a look at the IP Header and all fields contained within an Ethernet frame. Further examination of the I…
Windows Servers
Tombstone is a container object that contains the deleted objects from Active Directory. Actually when an object is deleted from Active Directory, it is not physically removed from the Active Directo…
Routing
This is the third article of our OSPF series which analyzes the different OSPF States routers go through during the OSPF discovery and neighbor forming process. We analyze OSPF states (Init state, 2-…

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