Tag: introduction

Introduction to VLANs

I’m always amazed how people get themselves all tied in a knot when the topic of VLANs comes up. At the most basic level, a VLAN is nothing more than a broadcast domain. The only difference between a traditional broadcast domain and one defined by a VLAN is that traditionally a broadcast domain has been seen as a distinct physical entity whose boundaries consist of a router. In fact, VLANs are very similar – their boundaries are also defined by a routing device, just like any broadcast domain. However, a VLAN is a logical construct, meaning that hosts are not necessarily groups within the physical confines of a traditional broadcast domain.

An Introduction to Network Firewalls and Microsoft Internet Security and Acceleration Server

Everyone needs a firewall. If you run a web site, have a dial-up connection or control a corporate backbone you have to install a firewall. This will allow the control of what internal information from your network or computer is allowed to go out, and what information is allowed to come in. Taking advantage of a simple firewall installation can help you preserve your data and report all attempts of unauthorized access.

Introduction to Relational Database Systems

If you collect and use any kind of data you probably have some kind of organizing system. Whether you use index cards, a filing cabinet, Excel spreadsheets, or some kind of database program, your system should let you add and change data, delete data, and retrieve data, and it should work faster and more efficiently than if you had to do it by hand.

Introduction To Network Attacks

As a network administrator, it is important that you understand the nature of potential attacks on computer security. We’ll briefly describe the most important types of attacks so that you can better understand precisely what the Linux IP firewall will protect you against. You should do some additional reading to ensure that you are able to protect your network against other types of attacks. Here are some of the more important methods of attack and ways of protecting yourself against them: Unauthorized access

Introduction to Cryptography

Secret messaging has been in vogue since the times of Julius Caesar. But later, this art of communicating messages in a secret or encoded form has come to be known as cryptography. The word cryptography is derived from Greek and means ‘secret writing’. This article is intended to introduce you to the basics of cryptography and lead you to do some encryption stuff yourselves.

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