Topologi LAN (Local Area Network)

Topologi LAN(Local Area Network)
LAN (local area network) adalah sejumlah komputer yang dihubungkan bersama di dalam suatu areal tertentu yang tidak begitu luas, seperti di dalam suatu kantor atau gedung.LAN tersusun dari beberapa element yang meliputi hardware dan software,yaitu:

1.Komponen fisik
Komponen LAN yang terdiri dari Personal computer(pc),network interface card(INC),kabel,dan topologi jaringan

2.Komponen Software
Komponen LAN yang terdiri dari sistem operasi jaringan,Network Adapter Driver dan protocol jaringan.

Tipe LAN(Local Area Network) Ada 2 yaitu:
1.Jaringan Client-Server
2.Jaringan Peer to Peer

Slow Computer Fix - The Fast Solution for a Slow and virus Infected PC

Author: Brad Armstrong

Have you ever been annoyed by the "virus scan" pop up when viewing a website? This aggravating and dangerous program makes it difficult or even impossible to leave the page or exit your current program without completely shutting down the system and if you click on many of these you get a virus, or worse on your computer and need a slow computer fix.

There's a way, though to resolve this issue without having to shut down the computer on many cases.

1. Right click the taskbar and click "Task Manager". From there select the "Applications" tab. Find your browser in the list and stop it. by clicking on "end task" button on the bottom of the screen. This will shut down that application and allow you to continue working and you can open a new browser window again.

2. From the task manager windows, selecting the "Performance" tab will show you a graphical representation of whats going on with your system. There is also a small bar graph that shows you your current CPU usage. This shows you how hard the computer is working. The higher your CPU usage the slower it will run. Navigating to a web page, opening a program, anything you attempt to do will take longer. If the CPU usage is too high it may cause your computer to freeze.

If your computer usage is running abnormally high you may be infected by spyware and need a slow computer fix and to be able to stop this infection too.

It is possible stop spyware problem using task manager as well. Select the "Processes" tab. Here you can see all the running programs on your system. You may notice that the numbers in the CPU column are high. This indicates that here may still be a problem.

Select "iexplore.exe" from the list. This is the web browser. Click the end task button to close your browser. This should stop whenever spyware was attempting to attack your computer through your browser. Select "Performance" tab and check your CPU Usage again. It should have decreased improving the speed of your system.

3. Another problem that could slow your computer down is lack of memory. In task manager select the "Performance" tab and look for the "Physical Memory" section. Locate the number labeled "Total" and subtract 70 percent. Look at the "Available" figure and if this number is lower than the first you may not have enough memory. Of your "available" memory drops too low your computer will run very slow. Closing running programs or installing more ram memory are the only ways to correct this issue.

4. Optimize your computer and fix system and registry errors.

Once you have carried out the above steps you may still find your computer running slow. This may mean the following.

1. You have spyware on your computer.
2. Your computer needs to be optimized.
3. There are too many programs in it consuming too much memory.
4. There is registry corruption.

If your computer has any of these problems you can fix them by running a system and registry scanner. This will detect errors and fix them quickly and stop spyware too as well as optimize your computer for you.
If you find your computer running slow scan it now for a slow computer fix.

Article Source: http://www.articlesbase.com/operating-systems-articles/slow-computer-fix-the-fast-solution-for-a-slow-and-virus-infected-pc-4245818.html

About the Author

Here is the #1 solution for a slow computer fix just click here now.

Linux Recovery Software to Safely Deal With Any Linux Data Loss Problem

Author: Maria Peter

Linux is an advanced operating system and over the years, it has given more ease of usage. Since its development, with every passing year, more and more users have opted for Linux. For it's useful and quality features, many industries, entrepreneurs and individual users have shown faith on this comparatively new operating system. As this is the most frequently updated operating system among its class, many users even consider Linux as absolutely flawless. However, as we all know, no application is completely free from problems and Linux also has its share as well. But, the good thing is that with Linux data recovery utilities, you have ample chance of recovering your data back after any occurrence of data loss or inaccessibility problem.

There can be a number of situations, in which you may lose your valuable data from your so called robust Linux system. Below mentioned are some of the mostly encountered ones:

* Accidental or intentional deletion of data from the Linux system.
* File system corruption.
* Operating system malfunction.
* Virus/malware infection.
* Any application contradiction resulting in the crash or corruption of the Linux OS etc.

The list can be very long and the most threatening point of all these situations is the loss or inaccessibility of your valuable data from the Linux system. But, the good thing that may sooth your nerves a little is that after any occurrence of data loss, the data from the Linux drive does not get lost permanently. If the lost data is not overwritten, you can always have a chance of recovering the data back from the troubled drive or volume.

Therefore, once, you encounter any data loss situation and if you do not have a valid backup of your data, ensure that there won't be any activity on the troubled drive. Then, without any further experimentation, run any good Linux file recovery utility.

These undelete Linux applications have immense potential to dig into the troubled Linux hard drive or volume and locate the lost data. These utilities are completely read-only in their operations and do not make any modification to the original data or its format.

Article Source: http://www.articlesbase.com/data-recovery-articles/linux-recovery-software-to-safely-deal-with-any-linux-data-loss-problem-4243238.html

About the Author

Maria Peter a student of Mass Communication doing research on Data recovery Linux, Linux Data Recovery software And Ext3 Recovery.she is also a freelancer for http://www.stellarlinuxdatarecovery.com/

What to look for in a wireless router

Author: Pandora Devine

Shopping for a new wireless router can be an intimidating experience for many and can often end with spending far more money than is necessary. With the incomprehensible alphabet soup of router specifications, numerous numbers big and small, and pushy salesmen itching for money, buying a new piece of hardware for a wireless broadband setup can be a frightening experience. But it doesn't need to be, with just these few basic pieces of information anyone can confidently walk into the electronics section and make a purchase that is right for them.

A need for speed?

While a faster internet connection is always an ambitious goal and should be on the top of anyone's list, actually increasing that speed comes with many strings attached. Simply buying the most expensive router will not guarantee a faster web browsing experience. So put the £100 router down, walk away from the ledge, and do some homework.

Many internet providers and countries have restrictions on how many MB per second (MBPS) you can use, that means that even if you buy the fastest router ever made your browsing speeds could be no faster than your next door neighbour's. Find out just how many MBPS you are allowed by your provider and apply that to the kind of router you want.

Decide what you are primarily using your broadband for. Are you simply checking emails and doing a bit of web browsing? Or are you streaming videos and downloading large files? Does anyone in your house play online videogames that require a superfast connection? There is no need to get a super high speed router if you will only be using a fraction of its capabilities. Speaking of super high speed routers, just how are they classified?

The most general term for routers has evolved with three different letters accompanying each generation (technically there are four generations, but you almost never see the first generation anymore). From oldest and slowest to newest and fastest, the letters you are going to see associated with speed on a router are b, g, and n. These generations match up with the same labels for modems, so if you have a modem from the b generation, getting a router from the g or n generations will not boost your speed in any way. However, having a modem from the n generation and using a g router will slow your home broadband down, so be sure your hardware matches.

The next important label you will see is the GHz, which will be either 2.4 GHz or 5GHz. While they have slight differences, both generally work the same way and neither is outright better than the other. Many other electronic devices such as your phone, garage door opener, etc. might run on 2.4 GHz, which could cause interference with your 2.4GHz router. However, outside of this inconvenience, the two technologies work basically the same, and the 2.4GHz routers tend to be quite a bit cheaper.

Finally, before you go into the store you are also going to want to evaluate the specifications of all of your existing hardware, including your modem and your computer. Does your laptop only have one internal antenna in it? There is no need to buy a router with three or four antennas if you will only be using half of them. However, getting a router with 2 antennas when your computer has four could leave you using only half of your signal capabilities.

While it may be daunting to commit yourself to a new router for the next few years, trust that you are making the right decision after you have evaluated all of the above. If you need further assistance, don't panic into an irrational purchase, kindly let your salesman know that you are still in the research phase and just want a little information. They should also let you know about the different mobile broadband providers and packages. After you have made your purchase you can sleep soundly knowing that your broadband is up and running to its fullest potential.

Article Source: http://www.articlesbase.com/networks-articles/what-to-look-for-in-a-wireless-router-4245005.html

About the Author

Pandora Devine is a freelance journalist and is raising her profile in the field of mobile technology. She wrote this article originally for Orange UK.

Alat Untuk Membuat Jaringan

Membuat jaringan di perlukan keahlian kusus , perlu trik dan tips untuk menjalankan berbagai program secara berkualitas:
1.Tang Crimping
2.Conector RJ-45
3.Kabel UTP
4.Land Card/Modem
5.Tester
6.Switch/HUB
7.Sambungan Ke Internet

Jaringan Komputer

Jaringan komputer adalah sebuah kumpulan komputer,printer dan peralatan lainnya yang terhubung dalam satu kesatuan.informasi dan data bergerak melalui kabel-kabel atau tanpa kabel sehingga memungkinkan pengguna jaringan komputer dapat saling bertukar dokument dan data,mencetak pada printer yang sama dan bersama-sama menggunakan hardware/software yang terhubung dengan jaringan. setiap komputer,perinter atau periferal yang terhubung dengan jaringan di sebut node.Sebuah jaringan komputer dapat memiliki dua,puluhan,ribuan atau bahkan jutaan node.

Jenis Jaringan Komputer
1.Local Area Network (LAN)
2.Metropoloitan Area Network (MAN)
3.Wde Area Network (WAN)
4.Internet
5.Jaringan Tanpa kabel

Alat Input Dan Output

sebagai tambahan,perangkat keras dapat memasukan komponen luar lainnya. Dibawah ini merupakan komponen standar atau yang umum di gunakan.

-Input
-Keyboard
-Alat penunjuk
-Mouse
-Trackball
-Joystick
-Gamepad
-Scanner gambar
-Webcam
-Tablet grafis

-Output
-Printer
-Speaker
-Monitor
-Jaringan/Networking
-Modem
-Kartu network

Hardware

Hardware atau perangkat keras adalah semua bagian fisik komputer dan dibedakan dengan data yang berada di dalamnya atau yang berpropesi di dalamnya, dan di bedakan dengan perangkat lunak (software) yang menyediakan intruksi untuk perangkat keras dalam menyelesaikan tugasnya.
Batasan antara perangkat keras dan perangkat lunak akan sedikit buram kalau kita berbicara firmware karena firmware ini adalah perangkat lunak yang dibuat ke dalam perangkat keras. firmware ini merupakan wilayah dari bidang ilmu komputer dan teknik komputer,yang jarang di kenal oleh pengguna umum.
Komputer pada umumnya adalah dalam bentuk dekstop atau menara kotak yang terdiri dari bagian berikut:
-Papan sistem/atau papan induk yang merupakan tempat CPU,memory dan bagian lainnya,dan memiliki slot untuk kartu tambahan
-Ram adalah tempat penyimpanan jangka pendek,sehingga komputer tidak selalu mengakses harddisk untuk mencari data.Jumlah RAM yang lebih besar akan membantu kecepatan PC.
-Busses:
-Bus PCI
-Bus ISA
-USB
-AGP
-CPU(Central processing unit)sebagai otak dan bagian utama komputer
-power supply adalah sebuah kotak yang merupakan tempat transpormer ,control voltase dan kipas.
-Pengontrol penyimpanan,dari jenis IDE,SCSI atau lainnya,yang mengontrol harddisk,flopy disk,CD-ROM dan drive lainnya;kontroler ini terletak di papan induk atas papan atau di kartu tambahan.
-Pengontrol penyimpanan video yang memproduksi output untuk komputer display.
-pengontrol komputer bus (pararel,serial USB,firewire) untuk menyambung komputer dengan alat tambahan luar lainnya seperti seperti printer dan scaner
-beberapa jenis penyimpanan komputer:
-CD
-CD-ROM
-CD-RW
-CD-R
-DVD
-DVD-ROM
-DVD-RW
-DVD-R
Harddisk adalah madia penyimpanan jangka panjang
-Jaringan komputer adalah untuk menghubungkan komputer ke internet dan/atau komputer lainnya
- Modem adalah media penyambung ke koneksi internet

How to add a routing interface to your Windows 2003 server

Author: Mohamed AhmedOuamer

By default, IP routing is not enabled on all interfaces attached to Windows server 2003 based computer. This means even if you have enabled the routing service before, the server cannot perform routing function until you define the interfaces and choose a routing method (static or dynamic). Therefore, you should enable IP routing on wanted interfaces before starting configuring static IP routing or a dynamic IP routing protocol such as RIP (Routing Information Protocol) or OSPF (Open Shortest Path First) on Windows Server 2003 operating system.

In the coming paragraphs, you'll learn how to add a routing interface to your Windows 2003 server. This article is written for LAN administrators, Windows Administrators and students preparing Windows server 2003 certifications. It can be useful also for people studying for the CCNA (Cisco Certified Network Associate) certification exam.

Read these instructions in order to add an interface of routing:

Step 1: Open the Routing and Remote Access MMC.

Step 2: In the tree structure of the Routing and Remote Access MMC, click on Routing and Remote Access.

Step 3: Click on the name of your server.

Step 4: Click on IP Routing

Step 5: Click on General

Step 6: Click with the right button of your mouse on General, and then click on New interface

Step 7: In Interfaces, click on the interface to add, and then click on OK

Step 8: If necessary, fill the configuration dialog boxes for the interface.

Take into account that you should be a member of the Administrators group in order to execute this procedure. It is suggested to right-click the Routing and Remote Access icon and then click on Run As option rather than to open a Windows session using the credentials of a member of the Administrators group.

If you opened a session with identification information of a member of the Administrators security group, you can also open the Routing and Remote Access MMC (Microsoft Management Console) by double-clicking on Routing and distant access located in the Administrative Tools folder, which you can it by clicking on Start and then click on Control panel.

On Cisco routers, IP routing is enabled by default on all interfaces having an IP address. However, on Cisco switches, IP routing is disabled by default.

Article Source: http://www.articlesbase.com/networks-articles/how-to-add-a-routing-interface-to-your-windows-2003-server-4150161.html

About the Author

The CCNA exam is not an easy exam, and I suggest you to purchase one CCNA study guide from the ones available on the market or get a video CCNA certification training to pass you exam and build up your routing and switching skills.

Types of Computer Hardware

Author: Isabel

Computer hardware is a physical part of a computer that executes within the hardware. It is unlike computer software or data that can be frequently changed, modified or erased on a computer. Computer hardware is not frequently changed and so is stored in hardware devices such as read only memory (ROM) where it is not readily changed.

Most computer hardware is embedded and so is not visible to normal users. Below are the different types of hardware's found in a computer.

Ø Motherboard: It is the central or primary circuit board making up a complex electronic system such as a computer. A motherboard is also known as a main board, logic board or system board.

Ø Central processing Unit: A CPU is the main component of a digital computer that interprets instructions and process data in computer programs.

Ø Random Access Memory: A RAM allows the stored data to be accessed in any order. RAM is considered as the main memory of the computer where the working area is used for displaying and manipulating data.

Ø Basic Input Output System: BIOS prepares the software programs to load, execute and control the computer.

Ø Power Supply: Power Supply supplies electrical energy to an output load or group of loads.

Ø Video Display Controller: It converts the logical representation of visual information into a signal that can be used as input for a display medium.

Ø Computer Bus: It is used to transfer data or power between computer components inside a computer or between computers.

Ø CD-ROM drive: It contains data accessible by a computer

Ø Floppy disk: It is a data storage device

Ø Zip Drive: It is a medium capacity removable disk storage system.

Ø Hard Disk: It is a non-volatile data storage system that stores data on a magnetic surface layered unto hard disk platters.

Isabella Rodrigues writes for compatibleinkjetcartridge.info,

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Article Source: http://www.articlesbase.com/computers-articles/types-of-computer-hardware-33669.html

About the Author

Isabella Rodrigues writes for compatibleinkjetcartridge.info,

offering the latest information on cartridges, visit them today for more best

buy printer cartridges.

Visit today: http://www.compatibleinkjetcartridge.info