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Rabu, 19 Januari 2011

WAN ( eng and idn)

desain pilihan WAN

WANs are used to connect LANs and other types of networks together, so that users and computers in one location can communicate with users and computers in other locations. WAN digunakan untuk menghubungkan LAN dan jenis lain dari jaringan bersama-sama, sehingga pengguna dan komputer di satu lokasi dapat berkomunikasi dengan pengguna dan komputer di lokasi lain. Many WANs are built for one particular organization and are private. Banyak WAN dibangun untuk satu organisasi tertentu dan swasta. Others, built by Internet service providers , provide connections from an organization's LAN to the Internet. Lainnya, dibangun oleh penyedia layanan Internet , menyediakan koneksi dari organisasi sebuah LAN ke Internet. WANs are often built using leased lines . WAN sering dibangun menggunakan leased line . At each end of the leased line, a router connects to the LAN on one side and a hub within the WAN on the other. Pada setiap akhir leased line, sebuah router terhubung ke LAN di satu sisi dan sebuah hub dalam WAN di sisi lainnya. Leased lines can be very expensive. Leased line bisa sangat mahal. Instead of using leased lines, WANs can also be built using less costly circuit switching or packet switching methods. Alih-alih menggunakan leased line, WAN juga dapat dibuat dengan menggunakan lebih murah switching sirkuit atau paket switching metode. Network protocols including TCP/IP deliver transport and addressing functions. Jaringan protokol termasuk TCP / IP memberikan transportasi dan fungsi pengalamatan. Protocols including Packet over SONET/SDH , MPLS , ATM and Frame relay are often used by service providers to deliver the links that are used in WANs. X.25 was an important early WAN protocol, and is often considered to be the "grandfather" of Frame Relay as many of the underlying protocols and functions of X.25 are still in use today (with upgrades) by Frame Relay. Protokol termasuk paket di atas SONET / SDH , MPLS , ATM dan Frame relay sering digunakan oleh penyedia layanan untuk memberikan link yang digunakan dalam WAN. X.25 merupakan protokol WAN awal yang penting, dan sering dianggap sebagai "kakek" Frame Relay karena banyak protokol yang mendasari dan fungsi X.25 yang masih digunakan sampai sekarang (dengan upgrade) dengan Frame Relay.

Academic research into wide area networks can be broken down into three areas: Mathematical models , network emulation and network simulation . Akademik penelitian jaringan luas lahan bisa dipecah menjadi tiga bidang: model Matematika , persaingan jaringan dan simulasi jaringan .

Performance improvements are sometimes delivered via WAFS or WAN optimization . perbaikan kinerja kadang-kadang disampaikan melalui WAFS atau optimasi WAN .
[ edit ] WAN connection technology options [ sunting ] opsi koneksi teknologi WAN

There are also several ways to connect NonStop S-series servers to WANs, including via the ServerNet Wide Area Network (SWAN) or SWAN 2, 3, 4, 5, 6, 7, 8, 9, 10 concentrators, which provides WAN client connectivity to servers that have Ethernet ports and appropriate communications software. Ada juga beberapa cara untuk terhubung NonStop server S-series untuk WAN, termasuk melalui ServerNet Wide Area Network (SWAN) atau SWAN 2, 3, 4, 5, 6, 7, 8, 9, 10 konsentrator, yang menyediakan klien WAN konektivitas ke server yang memiliki port Ethernet dan tepat perangkat lunak komunikasi. You can also use the Asynchronous Wide Area Network (AWAN) access server, which offers economical asynchronous-only WAN access. Anda juga dapat menggunakan Asynchronous Wide Area Network (Awan) akses server, yang menawarkan akses ekonomis hanya asynchronous-WAN. Several options are available for WAN connectivity: [ 2 ] Beberapa pilihan tersedia untuk konektivitas WAN: [2]
Option: Opsi: Description Deskripsi Advantages Keuntungan Disadvantages Kekurangan Bandwidth range Kisaran bandwidth Sample protocols used Contoh protokol yang digunakan
Leased line Leased line Point-to-Point connection between two computers or Local Area Networks (LANs) Point-to-Point koneksi antara dua komputer atau Local Area Network (LAN) Most secure Paling aman Expensive Mahal PPP , HDLC , SDLC , HNAS PPP , HDLC , SDLC , HNAS
Circuit switching Circuit switching A dedicated circuit path is created between end points. Jalur sirkuit khusus diciptakan antara titik berakhir. Best example is dialup connections contoh terbaik adalah dialup koneksi Less Expensive Kurang Mahal Call Setup Call Setup 28 - 144 kbit/s 28-144 kbit / s PPP , ISDN PPP , ISDN
Packet switching Packet switching Devices transport packets via a shared single point-to-point or point-to-multipoint link across a carrier internetwork. Perangkat transportasi paket melalui tunggal bersama-point to-point atau link point-to-multipoint melintasi internetwork carrier. Variable length packets are transmitted over Permanent Virtual Circuits ( PVC ) or Switched Virtual Circuits ( SVC ) Variabel panjang paket dikirim melalui Tetap Virtual Circuits ( PVC ) atau Switched Virtual Circuits ( SVC ) Shared media across link Media bersama di link X.25 Frame-Relay X.25 Frame-Relay
Cell relay Cell relay Similar to packet switching, but uses fixed length cells instead of variable length packets. Serupa dengan packet switching, tetapi menggunakan panjang tetap sel bukan paket panjang variabel. Data is divided into fixed-length cells and then transported across virtual circuits Data dibagi ke dalam sel tetap-panjang dan kemudian diangkut melintasi sirkuit virtual Best for simultaneous use of voice and data Terbaik untuk penggunaan simultan suara dan data Overhead can be considerable Overhead bisa banyak ATM ATM

Transmission rates usually range from 1200 bit/s to 24 Mbit/s, although some connections such as ATM and Leased lines can reach speeds greater than 156 Mbit/s. Tingkat Transmisi biasanya berkisar dari 1200 bit / s ke 24 Mbit / s, meskipun beberapa koneksi seperti ATM dan Leased line dapat mencapai kecepatan lebih dari 156 Mbit / s. Typical communication links used in WANs are telephone lines, microwave links & satellite channels. hubungan komunikasi yang khas yang digunakan dalam WAN saluran telepon, saluran microwave link & satelit.

Recently with the proliferation of low cost of Internet connectivity many companies and organizations have turned to VPN to interconnect their networks, creating a WAN in that way. Baru-baru ini dengan proliferasi biaya rendah internet konektivitas banyak perusahaan dan organisasi telah berpaling ke VPN untuk menghubungkan jaringan mereka, menciptakan sebuah WAN dengan cara itu. Companies such as Cisco , New Edge Networks and Check Point offer solutions to create VPN networks. Perusahaan seperti Cisco , New Edge Networks dan Check Point menawarkan solusi untuk membuat jaringan VPN.

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