Firewall protection works by blocking certain types of traffic between a source and a destination. All network traffic has a source, a destination, and a protocol. This protocol is usually TCP, UDP, or ICMP. If this protocol is TCP or UDP, there is a source port and a destination port. Most often the source port is a random port and the destination port is a well-known port number. For example, the destination port for HTTP is 80 and the destination port for DNS is 53. If the protocol is ICMP, Read More

A decoupling capacitor (bypass capacitor) is a device that separates current and voltage levels from two separate sections of the same electronic device. Decoupling capacitors are useful in situations that require an electronic device to fluctuate current or voltage levels without straining the power supply. Decoupling capacitors can be used in electronic devices that have frequencies between several hundred KHz and several hundred MHz, but are not useful in devices that have frequencies above or below this range.   How a Decoupling Capacitor Works A decoupling capacitor serves as a Read More

In the early days of computers, technicians would engage in what is called “component level repair.” Plummeting equipment costs, explosive equipment complexity, and the rising costs of skilled labor has led to an almost complete decline of component level repair. Almost all computer repair is currently done by swapping out parts. Component Level Repair Each part of your computer consists of many smaller components. Your computers monitor, for example, will contain small components such as capacitors, resistors, transistors, and diodes. Most of the time these components will be stored inside Read More

Photosynthesis is the process that plants, some bacteria, and some animals use to convert light energy and other sources into sugar and other essential proteins that they need to survive. This article will go over how photosynthesis works and the many different aspects of this process. We will talk about photosynthetic membranes, light reactions, solar panels, and even address the types of animals that are capable of using photosynthesis. What is Photosynthesis Photosynthesis describes the process that plants use to convert light energy, water, and carbon dioxide into sugar and Read More

An Applet is generally a small application module that is developed to perform one specific task and it runs under the umbrella of another bigger application. In other words, an Applet often acts as a plug-in which can easily be integrated into a suitable application. Similarly, Java Applet is a small module written in the Java programming language which can be injected into any webpage to perform a specific task. The origin of the word “Applet” was first noticed in PC Magazine, 1990. Java Applet is run in a Java Read More

An Overview of Forests and Domains A domain is a collection of computers and resources that share a common security database, in this case, the Active Directory database. Computers in the domain also have a common namespace. A namespace is the hierarchical grouping of service and object names that are stored in Active Directory and DNS. Active Directory and DNS namespaces have to be the same. This is a Microsoft requirement. A domain can also be considered a security boundary because you can create and manage related resources within a Read More

A common word that is constantly uttered in our society, TiVo has revolutionized the way we watch TV. With its many features and functions that allow you to pause, record, and rewatch television, TiVo has quickly ushered in an age in which we no longer watch commercials and we don't worry about being home at 8 o' clock to watch our favorite sitcom. Many people, however, still do not know the wonders of TiVo and many more do not understand how it works. In this article, we will explain what Read More

Dynamic DNS is a technology that allows you to update the IP address of a domain in real time. In order to fully understand how Dynamic DNS works, it is important to first understand domain names and name servers. Essentially, all website domain names are held on computer servers known as name servers. These servers are used, with the help of a Domain Name System (DNS) server, to change the domain name into something more easily recognizable by a computer, a internet Protocol (IP) Address. Dynamic DNS works in roughly Read More

Java does not directly support constants. However, a static final variable is effectively a constant. The static modifier causes the variable to be available without loading an instance of the class where it is defined. The final modifier causes the variable to be unchangeable. Naming Standards for Java Constants Java constants are normally declared in ALL CAPS. Underscores normally separate Words in Java constants. Sample Java Constant Declaration public class MAX_UNITS { public static final int MAX_UNITS = 25; Vedios Related to Java Constant Declaration

A network is an interconnection of multiple computers, peripherals and network devices. Networks are commonly created at homes and offices to share resources (like printers, scanners, files, media, and Internet connection), communicate, or play multi-player games. A network is created with two or more computers, networking devices and some cabling. Before you begin to setup a network, answer the following as a prerequisite: Which type of network do I need to set up? Ethernet? Wireless? HPNA? Which are all of the networking devices I require? Hubs? Switches? Routers? How much Read More