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Cisco Routers

Installing Security Device Manager (SDM) on a Cis…

For years now, Cisco has been developing its Security Device Manager (SDM) software. This web-based software is designed to help the less experienced users and administrators to work and configure va…

Network Cabling

1Gigabit 802.3ab -10GBase (10Gigabit) 802.3an Eth…

The 1000Base Ethernet standard, also referred to as Gigabit Ethernet (GbE or 1GigE) is defined by the IEEE 802.3-2008 standard and provides 10 times faster transfer speeds of 100Base Ethernet. Gigabi…

Windows Servers

Windows 2012 Server Foundation, Essential, Standa…

FREE Hyper-V & VMware Virtualization Backup: FREE for Firewall.cx readers for a Limited Time! Download Now! Windows Server 2012 Editions On the 1st of August, 2012 Microsoft releas…

Subnetting

IP Subnetting - Part 1: The Basic Concepts

When we subnet a network, we basically split it into smaller networks. For example, when a set of IP Addresses is given to a company, e.g 254 they might want to "break" (the correct term is "partitio…

Cisco Services & Technologies

How to Fix Cisco VPN Client Error 51 – Unable to…

Apple Mac OS X users are frequently faced with the Cisco VPN Client Error 51 - Unable to Communicate with the VPN Subsystem as shown in the screenshot below: When this error is produced, users wil…

TCP - UDP Protocol Analysis

Transmission Control Protocol - Part 2: Quick Ove…

As previously mentioned on a number of occasions, TCP is one of the two protocols that lives at the Transport layer and is used to carry data from one host to another. What makes TCP so popular is th…

TCP - UDP Protocol Analysis

TCP Header Anaylsis - Section 4: TCP Flag Options

As we have seen in the previous pages, some TCP segments carry data while others are simple acknowledgements for previously received data. The popular 3-way handshake utilises the SYNs and ACKs avail…

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

How to Enable Master Control Panel or Enable God…

Around 2007, an undocumented feature of Windows, called the God Mode, was published outside of documentation provided by Microsoft. This is the Windows Master Control Panel shortcut. Bloggers named i…

Windows Servers

Windows Server Group Policy Link Enforcement, Inh…

Our previous article explained what Group Policy Objects (GPO) are and showed how group policies can be configured to help control computers and users within an Active Directory domain. This article…

Cisco Routers

How To Configure DHCP Server On A Cisco Router

DHCP (Dynamic Host Configuration Protocol) is the protocol used by network devices (such as PCs, network printers, etc) to automatically obtain correct network parameters so they can access network a…

Windows Servers

Windows Server 2016 VM Backup with Altaro's New V…

Altaro has released Altaro VM Backup, a faster and lighter upgrade to its flagship Hyper-V and VMware backup solution, which now supports all Windows Server editions and includes several highly-reque…

Routing

Hybrid Routing Protocols - Advantages and Disadva…

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…