Proxy Server

Proxy server is a computer server or computer programs that can act as another computer to make requests to the content from the Internet or an intranet.

Proxy Server acts as a gateway to the Internet world for each client computer. Proxy servers are not visible to the client computer: a user who interacts with the Internet via a proxy server will not know that a proxy server is handling requests are done. Web server that receives requests from the proxy server will interpret these requests as if the request came directly from the client computer, instead of the proxy server.

Proxy servers can also be used to secure private network that is connected to a public network (like internet). Proxy servers have more functions than a router that features packet filtering because it is a proxy server is operating at a higher level and have a more thorough control of the access network. Proxy server that serves as a "security agency" for a private network, commonly known as a firewall.

How a Proxy?

Web Server

Web server is software that provides data services that functions accept HTTP or HTTPS requests from clients, known as a web browser and sends the results back in the form of pages - web pages that usually form an HTML documentKind - kind of Web Server diantanya:Apache Web Server - The HTTP Web Servers1.Apache Tomcat2.Microsoft Windows Server 2003 Internet Information Services (IIS)3.Lighttpd4.Sun Java System Web Server5.Xitami Web ServersWeb Server web 6.Zeus But the famous and frequently used are Apache and Microsoft Internet Information Services (IIS).The workings of the web server:1. The workings of the Web Server Web server is the machine where the application or distribute the software operates in a web page to the user, of course, in accordance with user demand.

Advantages and Disadvantages of DHCP in Windows

If you plug in (certain) protocol tcp / ip on your network. You may also need to use DHCP (Dynamic Host Connection Protocol) to set the IP address on your network client computers are. By using the DHCP server configuration issue at least be lighter. For the owner of the cafe will also have easy if you want to expand business by increasing the number of existing computers. Because it will not bother to set the IP address on a new computer installed in an existing network.
What is the DHCP server? DHCP stands for Dynamic Host Connection Protocol. Is an extension of the BOOTP protocol that makes the client computer can be connected in a network and automatically obtain an IP address (so we do not need to manually setting the IP address). DHCP also has the ability to provide every client in a network IP address, subnet mask, default gateway, the IP addresses for WINS servers and IP addresses for DNS servers.* Note: Although we are using DHCP to provide IP addresses automatically. Computer running DHCP, WINS and DNS server itself must use a static IP address. Also in its primary domain controller.
Many of the convenience offered by the DHCP server in particular on providing a dynamic IP address. We can freely move the computer in a network to other networks that also use a DHCP server without having to reset the IP address. For the cafe that will expand also freely add computers.

File Transfer Protokol

FTP stands for File Transfer Protocol. FTP consists of a client and a server which is an application that provides access / exchange of data transfer between two computers (client and server). Transfer the file / data can be shaped teradi between mainframe computers and a computer on a local network. Or data transfer can occur from our computer to an FTP server via the internet. FTP is an application that is very useful (powerful) because this application provides access to the visitor or user to access data stored on those servers, and can be accessed by a large number of computers simultaneously
The process that occurs in the FTP
Broadly speaking, the process of transfer of data or files on the FTP has two grooves.
The first path is the process of transferring data from local computer (your computer) to a computer server (remote computer) that provides access to ftp, this process is known as the UPLOAD, while the data transfer process from the server computer (remote to local computer (your computer) prosess called DOWNLOAD.
Below is its plot:
Forms FTP

Dynamic Host Configuration Protocol

DHCP (Dynamic Configuration Protocol) is a service that automatically assigns IP numbers to computers that request it. The computer that gives the IP number is referred to as a DHCP server, while the computer that requested the IP number is referred to as a DHCP Client. Thus, administrators no longer need to provide the IP numbers manually at the configuration of TCP / IP, but simply pass a reference to the DHCP Server. At both the DHCP client is enabled, then the computer do the request to the DHCP-Server to get the IP number. DHCP answer by giving the IP number in the DHCP database. DHCP Server after giving the IP number, then the server lend (lease) the number of existing IP to DHCP-Client and cross out the IP number from the pool list. IP numbers are given along with the subnet mask and default gateway. If nothing else the IP number can be given, then the client can not initialize TCP / IP, by itself can not connect to the network. After a certain period of time, then use the DHCP Client is declared selesaidan client does not renew the request again, then the IP number is returned to the DHCP Server, and the server can provide a number IP to the client in need. This long period can be determined within minutes, hours, months or forever. Period called the leased period. DHCP How it Works: DHCP uses 4 stages of the process to provide configuration of the IP numbers. (If Clietn have more than one NIC card and need no more than 1 IP the DHCP process is run for each adapter individually):  
1. Least IP Request Client requests to the server IP number (Broadcast find DHCP server).

How Domain Name Servers Work

If you spend any time on the Internet sending e-mail or browsing the Web, then you use domain name servers without even realizing it. Domain name servers, or DNS, are an incredibly important but completely hidden part of the Internet, and they are fascinating. The DNS system forms one of the largest and most active distributed databases on the planet. Without DNS, the Internet would shut down very quickly.
When you use the Web or send an e-mail message, you use a domain name to do it. For example, the URL "http://www.howstuffworks.com" contains the domain name domain.com. So does the e-mail address "iknow@domain.com."

­Human-readable names like "howstuffworks.com" are easy for people to remember, but they don't do machines any good. All of the machines use names called IP addresses to refer to one another. For example, the machine that humans refer to as "www.howstuffworks.com" has the IP address 70.42.251.42. Every time you use a domain name, you use the Internet's domain name servers (DNS) to translate the human-readable domain name into the machine-readable IP address. During a day of browsing and e-mailing, you might access the domain name servers hundreds of times!
In this article, we'll take a look at the DNS system so you can understand how it works and appreciate its amazing capabilities.

Internet Protocol

In order to apply proper intrenet network there should be a standard set of rules because it required an internet protocol.History of TCP / IP
 Internet Protocol was first developed by the Defense Advanced Research Projects Agency (DARPA) in 1970 as the beginning of an effort to develop a protocol that can interconnect a variety of separate computer networks, each network uses different technology. The main protocol that generated this project is the Internet Protocol (IP). The same research also developed that is some high-level protocol designed to work with IP. The most important of these projects is the Transmission Control Protocol (TCP), and all the protocol groups is replaced with TCP / IP suite. First TCP / IP implemented in the ARPANET, and began to flourish after the University of California at Berkeley began to use TCP / IP with the UNIX operating system. Apart from the Defense Advanced Research Projects Agency (DARPA) is developing the Internet Protocol, which also developed the TCP / IP is the Department of defense (DOD).The terms in the Internet Protocol
       There are several terms that are often found in discussion of the TCP / IP, some of them:Host or end-system, a customer at the service communication network. Hosts are usually in the form of individual workstations or personal computers (PCs) where the duties of the host is usually a running application and

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5 Solid Tweaks to Optimize Your Computer For Gaming

Of course, there’s a good chance your computer isn’t even running at its optimum performance. A cluttered hard disk or outdated graphics card can go a long way to slowing down your gaming system.
Below are a number of tips to optimize your computer for gaming, and allow you to play more games with your current set up. Have a slightly outdated computer? There might still be some hope for you!

1. Regular (Preventive) Maintenance

Although this seems rather obvious, a lot of people still neglect to maintain their hardware. Like with a car, if you don’t take care of it, it’ll slowly start to deteriorate. There are a few things we need to optimize your computer and to take care of it keep it up and running.

Hard Drive Space

First and foremost, make sure you still have some space left on your hard drive. I know a lot of people who operate at, or even above 95% of maximum storage capacity. Not only does this give you little breathing room, your computer will also run slower because of it. Admit it, you don’t need half of what’s stored on your hard drive right now. So get rid of it.

Defragmenting

When using a hard drive, space is used wherever available. As such, some files are fragmented all over the disk. The defragment utility analyzes your hard drive, and attempts to consolidate those fragmented files, in an attempt to optimize your computer and speed up your system.

Optimize Your Computer For Speed and Efficiency

I’ve been into computers for many years now, too many to count at this point, but when someone in my family or any friends have a computer problem they call me to help them out. One of the biggest complaints I run across is speed, and why is their computer running slow. There are of course a plethora of reasons their computer is running slow, usually it’s a virus or they’ve just got too much stuff going on at the same time and their computer just can’t handle it. Another thing I’ve run across is that people think a five year old computer should be able to do everything that a one year old computer can do, they think if it’s not broke, don’t fix it. Generally that’s a good rule, but not for computers really, the technology evolves so fast that in about six months your brand new computer is now a generation or two behind what’s on the market today. There are several things that one can do to make their computer faster and more responsive and I’ve compiled a list of many of them, it’s by no means every single thing you can do, but a lot of them are ones that the average user can do themselves with little or no technical knowledge. These tips are not limited to desktops, but for netbooks and laptops as well, but they can be limited by the operating system you’re using…
We’ll start off with the hardware stuff first..
The CPU or Processor:

6 Security To pPrevent Virus

Maybe this is something that is often discussed in various articles about computers in the entire blog on the internet. I myself since my computer is connected to the internet has not even faced a serious problem with the name of the virus. Although occasionally been made dizzy by it
Well at least until the computer security article was written!
I think there are 6 things that we ought to do so we do not computers affected or infected by a virus. Automatic computer security if we talk we talk about how to prevent computer viruses.
As for computer security affairs from the action the thief is beyond this article. Here only specialize weeks to Internet viruses.
Here's 6 Tips on Computer Security article :
 1. Use AntiVirus
Of course this is the most important. Would not want anti-virus as a guard that will prevent a variety of viruses. Oh yes! If  have not money ... please do not use pirated antivirus free antivirus use only. Not really a great lost in combating internet viruses.
2. UPDATE!
Do not forget to update anything for the sake of computer security. Not just any anti-virus definitions updated.