Komputer Virtual

Mungkin banyak dari kita yang masih belum mengenal software-software komputer virtual. Komputer virtual adalah sebuah software yang memiliki kemampuan untuk memvirtualisasikan satu atau lebih komputer dalam satu komputer. Dalam arti kata bahwa dengan komputer virtual ini, kita dapat mencoba melakukan installasi berbagai macam sistem operasi dalam satu komputer dengan aman tanpa takut terjadi kesalahan dalam melakukan instalasi yang bisa menyebabkan kehilangan data. Virtual Komputer berbeda dengan dual boot.

Dual Boot tidak memungkinkan kita untuk menjalankan semua Sistem Operasi secara bersamaan dalam satu waktu, sedangkan Virtual Komputer bisa 2 atau lebih jalan sekaligus. Selain itu manfaat komputer virtual dapat kita jadikan sebagai wahana belajar komputer percobaan untuk menguji aplikasi ataupun untuk mempelajari OS yang baru bagi kita. Nah cocok sekalikan dengan kita yang baru belajar, khususnya siswa atau mahasiswa.

Virtual komputer ini sering juga disebut sebagai virtual machine/CPU emulator/computer virtualizer/computer emulator/virtual PC, dll. Inti dari Virtual Komputer ini, mampu menghadirkan satu atau lebih komputer virtual lengkap dengan hard disk virtual dan perangkat hardware lainnya sehingga kita juga dapat membangun jaringan virtual antara semua komputer virtual dan komputer fisikal yang kita miliki. Sebagai gambaran, silahkan dilihat gambar diatas. Pada 1 komputer yang kita miliki bisa sekaligus menjalankan OS Windows 7dan XP dengan waktu yang bersamaan.

Langkah-langkah membuat Virtual PC adalah sebagai berikut :
1. Download Microsoft Virtual PC 2007 http://www.microsoft.com/windows/downloads/virtualpc/default.mspx

2. Download dan install!

3. Kemudian buka Microsoft Virtual PC,  Start>All Program>Microsoft Virtual PC

4. Maka tampilannya akan seperti dibawah ini.

 

5. Pilihlah create a virtual machine kemudian klik next!!!

 

6. Pilihlah Operating Sistem yang ingin anda install. Namanya bebas pada tutorial ini namanya 

“Windows XP Virtual”

7. Disini akan menginstall windows xp, pilih windows xp pada tampilan sbb;

8. untuk mengatur RAM yang digunakan pilih "Adjusting the RAM" kemudian atur RAMnya dengan cara menggesernya(disini RAM 512)

9. Selanjutnya untuk membuat Harddisk. klik A new Virtual Harddisk lalu dinext. Atur berapa kapasitas yang ingin anda jadikan harddisk pada komputer virtual (bebas). Sebesar 50 gb digunakan disini.

10. Klik Finish. Berikutnya adalah memasukkan Windows XP CD kedalam CD Rom drive dan start virtual machine.

11. Pastikan CD windows XP anda berada pada cdrom drive, dan start virtual machine.

Ada 2 cara menjalankan virtual machine. Pertama dengan mengklik virtual machine file (*.vmc) atau Klik start pada Virtual PC Console.
Note: beberapa setting pada virtual machine masih grayed out karena Guest OS belum terinstall dan belum memiliki software “Virtual Machine addition”.



12. Lakukan instalasi seperti biasa (bagaimana cara menginstalasi windows XP diluar dari tutorial ini).

13. Setelah OS terinstall dan anda dapat boot kedalam, waktunya menambahkan sebuah Virtual Machine Additions. Klik pada menu Action dan pilih “Install or Update Virtual Machine Additions”. anda akan mendapatkan warning, klik saja continue dan lakukan install. Setelah install selesai, restart system.
Note: Bila anda merasa cursor mouse terjebak dalam OS Guest (tidak bisa move ke OS Host) tekan saja tombol ALT yang disebelah kanan keyboard (jangan yang kiri!).

14. Selamat anda sudah membuat sebuah Virtual PC

*) Postingan Tambahan....
 Selanjutnya adalah dasar-dasar manipulasi file


1. Untuk mengcopy sebuah file dari host ke guest, klik dan drag sebuah file dari desktop/folder ke dalam virtual pc seperti pada gambar dibawah ini. Hal yang sama juga berlaku bila anda ingin mengcopy dari guest ke host.


16. Kelemahan dari cara diatas adalah bila anda ingin mengupdate file pada guest kemudian perubahan ini ingin juga diimplementasikan pada host maka anda akan sering click and drag. Cara lain yang lebih baik adalah membuat sebuah shared folder. Langkahnya adalah sebagai berikut:
1. Klik edit -> settings

3. lalu untuk mengakses shared folder, gunakanlah windows explorer pada guest operating system dan browse ke dari Y (atau drive letter lainnya bergantung dari mapping).


17. Menu setting juga dapat digunakan untuk mengedit nilai-nilai lain seperti besar memory etc.
Note:
1. USB Drive tidak didukung oleh virtual PC!
2. Ukuran file virtual PC cukup besar, bahkan sudah mencapai 1,4 gb padahal baru windows yang diinstall

Virtual CD/DVD

Virtual CD/DVD adalah semacam drive CD/DVD maya, yang mana komputer akan membacanya sebagai CD/DVD ROM, padahal drive CD/DVD tersebut tidak ada, Lalu apa kegunaan dari Virtual CD/DVD ?

Pernahkah anda memainkan sebuah game, dimana setiap kali anda bermain game (contohnya Need For Speed), anda diminta untuk memasukkan CD/DVDnya ? kalo blom pernah,, Silahkan dicoba memainkan Game seperti Need For Speed,, kalo udah pernah,, silahkan lanjut bacanya..

Untuk ngakalinnya biasanya kita mendownload cracknya dari internet, tapi kadangkala kita kesulitan untuk mencari cracknya di internet, juga beberapa game membaca image cd sebagai validasi untuk menggunakannya.. Nah,, untuk itulan kita membuat Virtual CD/DVD ini,,

Cara membuatnya cukup mudah,,

1. Disini menggunakan Alcohol 52%
   

 2. Masukan CD/DVD yang akan diburning.

3. Tentukan Destination folder untuk penyimpanan CD/DVD virtual

4. Setelah terbaca oleh alcohol 52%, klik start untuk memburn ke cd virtual

6. setelah itu tampilannya akan seperti ini, CD/DVD yang tadi diburn telah disimpan dan berekstensi file .iso

6. untuk membuka file iso tadi kita bisa menggunakan software ultraiso atau yang lainnya, bila ultra iso sudah terinstall langkahnya cuma klik kanan difile open with ultra iso dan "mount"

COMPUTER NETWORKS

A computer network is a collection of computers, printers and other equipment that is connected in unity. Information and data moving through wires or wireless computer network allowing users can exchange documents and data, print on the same printer and together using hardware / software that is connected to the network. Each computer, printer or peripherals connected to the network called a node. A computer network can have two tens, thousands or even millions of nodes.

TYPE COMPUTER NETWORKS
Generally, a computer network is divided into five types, namely;1. Local Area Network (LAN)Local Area Network (LAN), a private network inside a building or campus-sized to several kilometers. LANs are often used to connect personal computers and workstations in a corporate office or factories to use shared resources (eg printers) and exchange information.
2. Metropolitan Area Network (MAN)Metropolitan Area Network (MAN), is basically a LAN version of the larger and usually use the same technology with a LAN. MAN could include corporate offices are situated near or also a town and can be used for private purposes (private) or public. MAN capable of supporting voice and data, it can even connect with a cable television network.
3. Wide Area Network (WAN)Wide Area Network (WAN), its scope covers a wide geographical area, often covering a country or even continent. WAN consists of a collection of machines that aims to implement programs (applications) user.
4. InternetActually there are many in this world networks, often using hardware and software are different. People who connect to networks often wish to communicate with other people connected to other networks. This desire requires the relationship between networks that are often not kampatibel and different. Usually to do this requires a machine called a gateway in order to establish relations and carry out the necessary translation, both hardware and software. This is a collection of interconnected networks called the Internet.
5. Wireless NetworkingWireless network is a solution to the communication can not be done by using a cable network. For example people who want to get information or to communicate despite being located above the car or plane, then the wireless network is absolutely necessary because it is impossible to make cable connections in the car or plane. Currently the network without wires already rife used by utilizing satellite services and provide faster access speeds than networks using cable.


COMPUTER NETWORK topology
   
 Topology is a way to connect computers to each other so as to form a computer network. Way that is currently widely used is the bus, token-ring, star and peer-to-peer network. Each has a characteristic topology, with the advantages and disadvantages. 
1. BUS Topology
There are advantages and disadvantages of this type are:
Advantages:- Save cables- Layout simple cable- Easy to develop
Losses:- Detection and isolation of very small errors- Traffic density- If one client is damaged, then the network could not function.- Required repeater for long distance

2 Topology TokenRING
TokenRING topology shown in the scheme above. Token-ring method (often called ring only) is a way of connecting computers so shaped ring (circle). Each node has the same level. Network will be called as a loop, data is sent kesetiap node and eachinformation received by the node address is checked whether the data were for him or not. There are advantages and disadvantages of this type are:
Advantages:- Save cables
Losses:- Touchy error- Developing a network of more rigid

3 STAR Topology

Control is centralized, all links must pass through the center of all these nodes distribute such data or the client chooses. Central node is called primary or server stations and other stations are called secondary or client server. After a network connection initiated by the server, each client server at any time can use the network connection without waiting for commands from the server. There are advantages and disadvantages of this type are:Advantages:- Most flexible- Fitting / changing station is very easy and does not interfere with the other networks- Centralized control- Ease of detection and isolation of errors / defects- Kemudahaan network managementLosses:- Wasteful cable- Need special handling- Control center (HUB) to be a critical element

Simak

Baca secara fonetik

 
  4. Topology Peer-to-peer Network

    Peers meaning co-worker. Peer-to-peer network is a computer network comprising several computers (usually no more than 10 computers with printers 1-2). Within this network system is the preferred usage of the program, data and printer together. Named Dona computer users can use programs installed on your computer Dino, and they both can print to a printer at the same same.
    This network system can also be used at home. Computer users who have a computer 'old', such as AT, a new computer and want memberli, say Pentium II, no need to dispose of old computers. He simply put netword card in both computers then connected with special cables used for network systems. Compared with the third way, a network system is more simple so it is easier to learn and use.

UNDERSTANDING THE INTERNET

UNDERSTANDING INTERNET Internet (inter-network) may imply extensive computer network that connects computer users a single computer with other computers and can connect with a computer from country to country around the world, in which there are many kinds of information service facilities or surfing the Internet Browsing Namely activities of "surfing" on the internet. analogikan this activity can be like a walk in the mall, looking at the shop-tokotanpa buy anything. Electronic mail (E-mail) facility is used to send letters / with other orajng, without knowing the limits, time, space activities and even bureaucratic Namely Searching for specific information or data on the internet Catting this facility is used to communicate directly with other people on the internet . in general, these facilities are often used to talk or chat in the internet world wide web (WWW) with the world wide web (WWW) is you can take, formatting, and display information (including text, audio, graphics and video) using Mailing list links hypertekxt facility is used to discuss electronically by using E-mail.mailing This list is used to exchange information, opinions and so forth. Newsgroups are used to berkoferensi Fasilitad distance, so you dapatmenyampaikan opinions and responses on the internet. Download is the process of taking files from other computers via the Internet to our computer. Upload is the process of putting the files from our computer to other computers via the internet file transfer protocol (FTP) facility is used to perform retrieval elektroniok archives or files or transfer files from one computer to another computer on the Internet. Some on the internet has been available files or dokumentyang ready [to diduplikat by others for free. This facility is used to telnet into a specific computer systems and work on other computer systems. Ghoper facility was used to locate information stored on Internet servers using a hierarchy and you can take that information