Firewall technology has been around to protect networks for quite some time. Over the generations this technology has evolved into several distinct types. Knowing the different type of firewall technology will give you confidence in deciding which type of firewall to purchase. Common types of firewalls are as follows:

• Static packet filtering

• Circuit level

• Application layer

• Dynamic packet filtering

Static Packet Filter

A static packet filter firewall examines each packet against a set of rules. If the firewall rules allow this type of packet, it will then allow the packet to pass through. If the rule does not allow the packet then the packet is dropped or rejected depending on how the firewalls rules are set.

Circuit Level

This type of firewall validates the fact that a packet is either a connection request or a data packet belonging to a connection or a virtual circuit. Circuit level firewalls work on the transport level of the protocol stack. They are fast and transparent, but do not check the data in the packet.

Application Layer

A application Layer Firewall evaluates network packets for valid data at the application layer before allowing a connection. These types of firewalls determine if a connection to a requested specific application is permitted such as, email or internet access. Application Layer Firewalls can also validate other security items that appear only within the application layer data, like user password and service requests.

Dynamic Packet Filtering

Dynamic Packet Filtering Firewalls also known as stateful firewalls keep track of the actual communication process through the use of a state table. This type of firewall operations at layers 3, 4, and 5. Dynamic Packet Filtering firewalls can inspect and track each connection passing through the firewall on all interfaces. This technology allows the firewall to confirm they are valid packets.

It has become increasingly import for growing business and home users to implement a firewall solution to protect computers and user data. Over the years the firewall technology has evolved. It’s important to understand the different type of firewall technology that is out today. Having this knowledge will help your purchase the right firewall solution for your company or personal use.

Matt has been a Network Administrator for over 5 years now. You can check out his latest website Active Directory Tools which provides a list of useful tools for Network Administrators.

What are Pop Up or Under Window Ads?

It is a form of advertising on the World Wide Web or the Internet. It is basically used by webmasters (website owners) to attract visitors to special offers or to capture personal information of visitors like their name and email ID. There are two types, namely Pop Up or Under. As the name itself indicates they are self explanatory. Pop Up Windows are those that appear as a separate window from the top when you visit a website and alternatively, Pop Under are those which appear from under the present webpage. A visitor would not know that a separate window has been opened in the case of a Pop Under until he or she has closed the original one.

How is it done?

Normally, Pop Up or Under are written as a Javascript even though there are other means by which you could create Pop Up or Pop Under Windows. As you know, present day browsers are equipped to block (discussed separately below) these windows. All the major browsers namely, IE, Mozilla Firefox, Opera and now Chrome have built in options to block Pop Up or Under Windows.

Pop Up or Under Blocking -

Apples’ Opera browser was the first to incorporate Pop Up blocking tool in their browser. Then, Mozilla followed suite and incorporated Pop Up blockers in their now famous Firefox browsers. Today, all major browsers have built in Pop Up blockers which the users can either enable or disable as to their liking.

Solutions to come around this Pop Up Window Blockers -

Today due to the advance in technology, people have started to build Flash based Pop Up Ads which can’t be blocked because all the Pop Up Window Blockers which are incorporated in the present day browsers can block only Pop Up Windows written as a Javascript. They are incapable of blocking Pop Up Windows generated in Flash.

These Pop Up or Pop Under Windows are separate windows totally independent of the original window through which they were opened. Now, there is a little piece of software which creates a Float In Window which is totally different from these Pop Ups or Pop Under Windows. This Float In Window just as the name suggests, floats into the main webpage which is clearly visible to the visitor and is not annoying. The code for this Float in Window is part of the original webpage code. None of the present day Pop Up Windows can ever block this Float In Window.

Float In Window Generator is an application which creates Float In Windows which cannot be blocked by any Pop Up or Pop Under Blockers.

You buy your new computer and enjoy its speed, graphics and usability, but then for reasons unknown, it begins to slow down, freeze up sometimes and take a long time to boot. Why? Don’t you wish you knew how to make your computer run faster?

Deal with the registry to make your computer run faster.

One of the first things to check is the registry, a data base that all computers have, that keeps track of all of the software and hardware settings. As your computer goes about its business it is constantly accessing the registry. As time goes by the registry becomes corrupted, full of entries that are no longer valid this slows down the computer and causes windows to misbehave and the hardware to malfunction. You need to clean and fix the registry to make your computer run faster and keep windows from freezing.

Run the software the repair shop uses to fix your registry

Why take your computer to a repair shop where they will charge you $60 – $100 just to bring it in the door when your can download the same software to fix your registry and make your computer run faster right in the comfort of your own home. Not only is this cheaper, but it will save you money because it will keep your registry tuned.

If your computer has always run slowly you should check the amount of memory you have, because boosting your system’s memory can also make your computer run faster. Also make sure that your computer is spy ware and virus free. These are the three main areas to maintain on your PC in order to keep your computer running fast. So owning good registry software is never a bad idea, especially if you buy and download software that comes with life-time updates. That way when you upgrade your computer or get a new one your registry software will keep up. Clean your registry today and make your computer run faster.

Scan Your Registry
Now Free! Paul is a teacher, lecturer, and former IT guy. He writes about education issues, and computer and technology issues. What can a good piece of registry software do for your PC? Find out here!