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The IEEE 802.3 Frame Format
The following is a description of the Ethernet Frame Format described in the IEEE 802.3 Specification. The 802.3 Specification defines a 14 byte Data Link Header followed by a Logical Link Control He…
How to Join a Windows 8, 8.1 Client to Windows Do…
In this article, we will show how to add a Windows 8 or Windows 8.1 client to a Windows Domain / Active Directory. The article can be considered an extention to our Windows 2012 Server article coveri…
IP Subnet Calculator
This free online Subnet Calculator provides a fast and easy way to calculate all aspects of any IP Address and Subnet Mask. Simply enter your desired IP Address and Subnet Mask below and press Calc…
Firewall Topologies
In this section we are going to talk about the different ways a firewall can be set up. Depending on your needs, you can have a very simple firewall setup which will provide enough protection for you…
Propagation Delay
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…
Linux File & Folder Permissions
File & folder security is a big part of any operating system and Linux is no exception!
These permissions allow you to choose exactly who can access your files and folders, providing an overall…
How to Enable ‘Web Server’ Certificate Template O…
In this article we will show you how to enable the ‘Web Server’ certificate template option on a Windows Certification Authority (Windows CA) Server. The Web Server option is usually not presen…
Linux BIND DNS - Part 2: Configuring db.domain Z…
It's time to start creating our zone files. We'll follow the standard format, which is given in the DNS RFCs, in order to keep everything neat and less confusing.
First step is to decide on the doma…
VLANs - IEEE 802.1q Trunk Link Protocol Analysis
While the VLAN Tagging article briefly covered the IEEE 802.1q protocol this article will continue building upon it by further analyzing the IEEE 802.1q Trunk Link Protocol. The IEEE 802.1q tagging m…
What is Supernetting (Route Summarization) & How…
Supernetting is the opposite of of subnetting, and is also known as route aggregation or CIDR (Classless Inter-Domain Routing). Supernetting is a technique that allows multiple smaller network blocks…
Check Point Software and Cato Networks Co-Founder…
By: Shlomo Kramer, Check Point Software & Cato Networks Co-Founder
As one of the founders of Check Point Software and more recently Cato Networks, I’m often asked for my opinion on the future of…
The OSI Model: Layer 1 - Physical Layer
The Physical layer has two responsibilities: it sends bits and receives bits. Bits come only in values of 1 or 0. The Physical layer communicates directly with the various types of actual communicati…
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