DHANS BLOGS COMPUTER AND NETWORKS

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Selasa, 08 Maret 2011

Topologi WAN (Wide Area Network)


WAN (Wide Area Network) adalah jaringan komputer yang mencakup area yang besar sebagai contoh yaitu jaringan komputer antar wilayah,kota,bahkan negara,atau dapat didefinisikan juga sebagai jaringan komputer yang membutuhkan router dan saluran komunikasi publik.
WAN di gunakan untuk menghubungkan jaringan local yang satu dengan jaringan local yang lain,sehingga pengguna atau komputer di lokasi yang satu dapat berkomunikasi dengan pengguna dan komputer di lokasi yang lain.

Senin, 07 Maret 2011

Topologi MAN (Metropolitan Area Network)


Metropolitan Area Network adalah versi LAN yang dengan area yang lebih luas dan biasannya menggunakan teknologi yang sama dengan LAN. MAN dapat mencakup kantor-kantor perusahaan yang letaknya berdekatan atau juga sebuah kota dan dapat di manfaaatkan untuk keperluan pribadi (swasta) atau umum.
Man mampu menunjang data dan suara,bahkan dapat berhubungan dengan jaringan televisi kabel.

Minggu, 20 Februari 2011

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

Kamis, 17 Februari 2011

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/