Tugas Jaringan Komputer Lanjut

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Tugas Jaringan Komputer lanjut

- Dari 4 teknologi Area jejaring yang luas yang paling banyak digunakan untuk pengolahan data.  

- Jelaskan satu persatu dan berikan contohnya.

Jawaban :

Area Jejaring Yang Luas



-          Mencakup areal geografis yang luas
-          Sebagai teknologi alternative
a.       Circuit Switching
b.      Packet Switching
c.       Frame Relay
d.      Asynchronous Transfer Mode ( ATM )
  




A.         PACKET SWITCHING
Packet switching adalah metode komunikasi jaringan digital yang ditransmisikan kelompok semua data - terlepas dari konten, tipe struktur, atau - menjadi blok-blok berukuran yang sesuai, yang disebut paket . Fitur-fitur switching paket pengiriman variabel-bit-rate data stream (urutan paket) melalui jaringan bersama. Ketika melintasi adapter jaringan, switch, router dan lainnya node jaringan , paket buffer dan antri, mengakibatkan keterlambatan variabel dan throughput yang tergantung pada beban lalu lintas dalam jaringan.
Kontras packet switching dengan yang lain paradigma jaringan utama, sirkuit switching , sebuah metode yang menyiapkan sejumlah koneksi dedicated dari bit rate konstan dan keterlambatan konstan antara node untuk penggunaan eksklusif selama sesi komunikasi. Dalam hal biaya lalu lintas, misalnya dalam komunikasi selular layanan, sirkuit switching ditandai dengan biaya per unit waktu waktu koneksi, bahkan ketika ada data yang ditransfer, sedangkan packet switching dicirikan dengan biaya per unit informasi.
Dua mode paket utama beralih ada; (1) connectionless packet switching, juga dikenal sebagai datagram switching, dan (2) berorientasi koneksi packet switching, juga dikenal sebagai virtual circuit switching. Dalam kasus pertama setiap paket informasi yang lengkap mencakup pengalamatan atau routing. Paket yang diarahkan secara individual, kadang-kadang menghasilkan jalan yang berbeda dan out-of-order pengiriman. Dalam kasus kedua koneksi didefinisikan dan preallocated di setiap node yang terlibat selama fase koneksi sebelum semua paket ditransfer. Paket termasuk connection identifier daripada informasi alamat, dan disampaikan dalam rangka. Lihat di bawah ini .
Paket modus komunikasi dapat digunakan dengan atau tanpa node forwarding menengah (paket switch atau router ). Dalam semua modus komunikasi paket, sumber daya jaringan yang dikelola oleh statistik multiplexing atau alokasi bandwidth dinamis di mana saluran komunikasi secara efektif dibagi ke dalam jumlah yang sewenang-wenang logis variabel-bit-rate saluran atau data stream. Multiplexing statistik, packet switching dan lainnya toko-dan-maju penyangga memperkenalkan latency bervariasi dan throughput yang dalam transmisi. Setiap aliran logis terdiri dari urutan paket, yang biasanya diteruskan oleh multiplexer dan intermediate node jaringan asynchronous menggunakan first in first-out buffering. Atau, paket-paket dapat diteruskan sesuai dengan penjadwalan untuk beberapa disiplin antrian yang adil , lalu lintas membentuk atau untuk dibedakan atau dijamin kualitas layanan , seperti antrian wajar tertimbang atau ember bocor . Dalam kasus medium fisik bersama, paket-paket dapat disampaikan menurut beberapa modus-paket multiple access skema.
Contoh : Jaringan Telephone

B.         CIRCUIT SWITCHING 
Dalam dunia telekomunikasi, jaringan circuit switching adalah jaringan yang mengalokasikan sebuah sirkuit (atau kanal) yang dedicated di antara nodes dan terminal untuk digunakan pengguna untuk berkomunikasi. Sirkuit yang dedicated tidak dapat digunakan oleh penelepon lain sampai sirkuit itu dilepaskan, dan koneksi baru bisa disusun. Bahkan jika tidak ada komunikasi berlangsung pada sebuah sirkuit yang dedicated, kanal tersebut tetap tidak dapat digunakan oleh pengguna lain. Kanal yang dapat dipakai untuk hubungan telepon baru disebut sebagai kanal yang idle.
Untuk call setup dan pengendalian (dan keperluan administratif lainnya) dapat digunakan sebuah kanal pensinyalan yang dedicated dari node terakhir ke jaringan. ISDN adalah salah satu layanan yang menggunakan sebuah kanal pensinyalan terpisah. Plain Old Telephone Service (POTS) tidak memakai pendekatan ini.
Sebuah metoda untuk membangun, memonitor perkembangan, dan menutup sebuah koneksi adalah dengan memanfaatkan sebuah kanal terpisah untuk keperluan pengontrolan, misalnya untuk links antar telephone exchanges yang menggunakan CCS7 untuk komunikasi call setup dan informasi kontrol dan menggunakan TDM untuk transportasi data di sirkuit tersebut.
Sistem telepon zaman dahulu merupakan contoh penggunaan circuit switching. Pelanggan meminta operator untuk menghubungkan mereka dengan pelanggan lain, yang mungkin berada pada yang sama, atau melalui sebuah inter-exchange link dan operator lain. Dimanapun posisi para pelanggan ini, tetap terbentuk sebuah koneksi antar telepon kedua pelanggan selama hubungan telepon berlangsung. Kawat tembaga yang sedang digunakan untuk koneksi ini tidak dapat digunakan untuk hubungan telepon lain, walaupun para pelanggan ini tidak sedang berbicara dan jalur ini dalam kondisi tidak digunakan (silent).
Akhir-akhir ini sudah dapat dilakukan multiplexing terhadap berbagai koneksi yang terdapat pada sebuah konduktor, namun demikian tetap saja setiap kanal pada link yang mengalami multiplexing selalu berada pada salah satu dari dua kondisi ini : dedicated pada sebuah koneksi telepon, atau dalam keadaan idle. Circuit switching mungkin relatif tidak efisien karena kapasitas jaringan bisa dihabiskan pada koneksi yang sudah dibuat tapi tidak terus digunakan (walaupun hanya sebentar). Di sisi lain, keuntungannya adalah cepatnya membuat koneksi baru, dan koneksi ini bisa digunakan dengan leluasa selama dibutuhkan.
Pendekatan lain adalah packet switching yang membagi data yang akan dikirimkan (misalnya, suara digital atau data komputer) menjadi kepingan-kepingan yang disebut paket, yang lalu dikirimkan melewati sebuah shared network. Jaringan packet switching tidak membutuhkan sebuah sirkuit khusus untuk melakukan koneksi. Dengan pendekatan ini banyak pasangan node dapat melakukan komunikasi yang hampir simultan pada kanal yang sama. Dengan tiadanya koneksi yang dedicated, masing-masing paket yang diberikan dilengkapi dengan alamat tujuan sehingga jaringan dapat mengirimkan paket tersebut ke tujuan yang diinginkan.
Contoh : TCP/IP protokol

C.         FRAME RELAY
Frame Relay merupakan standar area jaringan yang luas teknologi yang menentukan link layer fisik dan logis dari saluran telekomunikasi digital menggunakan paket switching metodologi. Awalnya dirancang untuk transportasi di seluruh Integrated Services Digital Network (ISDN) infrastruktur, dapat digunakan saat ini dalam konteks banyak antarmuka jaringan lainnya.
Penyedia jaringan Frame Relay umumnya menerapkan untuk suara ( VoFR ) dan data sebagai enkapsulasi teknik, digunakan antara jaringan area lokal (LAN) melalui wide area network (WAN). Setiap pengguna akhir mendapatkan jalur pribadi (atau leased line ) ke Frame Relay simpul . Jaringan Frame Relay menangani transmisi melalui jalur yang sering berubah transparan untuk semua pengguna-akhir.
Frame Relay telah menjadi salah satu protokol WAN yang paling luas digunakan. Its murahnya (dibandingkan dengan leased line) yang disediakan salah satu alasan untuk popularitas. Kesederhanaan ekstrim mengkonfigurasi peralatan pengguna dalam jaringan Frame Relay menawarkan alasan lain untuk popularitas Frame Relay itu.
Dengan munculnya Ethernet lebih dari serat optik, MPLS , VPN dan berdedikasi broadband layanan seperti modem kabel dan DSL , akhirnya mungkin alat tenun untuk protokol Frame Relay dan enkapsulasi. [ kutipan diperlukan ] Namun banyak daerah pedesaan masih kurang DSL dan kabel modem layanan . Dalam kasus seperti jenis paling murah non-koneksi dial-up tetap menjadi 64-kbit / s frame-relay line. Jadi sebuah rantai ritel, misalnya, dapat menggunakan Frame Relay untuk menghubungkan toko pedesaan ke mereka WAN perusahaan.
Contoh : Transmisi digital/Fiber Optic

D.         ASYNCHRONOUS TRANSFER MODE
Asynchronous Transfer Mode atau Mode Transfer Asinkron (disingkat ATM) adalah nama sebuah jaringan khusus. ATM merupakan sebuah teknologi lapisan 2, yang dapat digunakan oleh siapa saja, namun sekaligus merupakan sebuah jaringan publik sebagaimana halnya Internet, dengan sistem pengalamatan yang dikelola secara rapi, sehingga setiap perangkat di dalam jaringan dapat memiliki sebuah identitas yang unik. [1] Asynchronous Transfer Mode merupakan standar internasional untuk cell relay di mana multiple tipe layanan (semisal suara digital / voice, video, atau data) disampaikan dalam fixed length (53-byte) cells.[2] Fixed-length cells memungkinkan proses sel (cell) berlangsung dalam perangkat keras (hardware), dengan demikian akan mereduksi keterlambatan transmit.[2] ATM dirancang untuk transmisi media berkecepatan tinggi seperti E3, SONET, dan T3.[2]
Pada ATM seluruh informasi yang akan ditransfer akan dibagi menjadi slot-slot dengan ukuran tetap yang disebut sel. Ukuran sel pada ATM adalah 53 oktet (1 oktet =8 bits) yang terdiri dari :[3]
          48 oktet untuk field informasi, dan
          5 oktet untuk header.
Sebagai teknologi yang dipilih oleh International Telecommunication Union (ITU, sebelumnya CCITT) untuk ISDN jalur lebar (broadband), protokol komunikasi ini juga dispesifikasikan oleh ATM Forum untuk transmisi 155 Mbps pada layer data link menggunakan kabel twisted pair dan aplikasi dalam pengkabelan fiber optik dalam versi yang terakselerasi dari Asynchronous Time Division Multiplexing (ATDM) untuk membawa banyak aliran informasi melalui sebuah kanal komunikasi.[4]
ATM berbeda dalam beberapa hal dari teknologi data link lain yang lebih umum seperti Ethernet.[4] Sebagai contoh, ATM tidak melibatkan routing. Komponen perangkat keras yang disebut ATM Switch membentuk koneksi point to point antara kedua ujung transmisi, dan data mengalir langsung dari sumber ke tujuan.[4] ATM tidak menggunakan paket dengan panjang yang berubah-ubah, tetapi menggunakan sel berukuran tetap.[4]
Kinerja ATM diekspresikan dalam bentuk tingkatan OC (Optical Carrier), dan ditulis sebagai "OC-xxx".[4] Tingkatan kinerja setinggi 10 Gbps (OC-192) secara teknis bisa dicapai dalam ATM. OC-3 (155 Mbps) dan OC-12 (622 Mbps) adalah tingkatan kinerja yang lebih umum untuk ATM.[4] ATM dirancang untuk mendukung pengelolaan pita lebar (bandwidth) yang lebih mudah. Tanpa adanya routing dan dengan sel berukuran tetap, pengguna dapat dengan mudah memonitor dan mengendalikan pita lebar (bandwidth) ATM dibandingkan dengan Ethernet.[4]
Teknologi ATM menawarkan dua karakteristik yang memperbaiki tingkat kecepatan transfer data.[5] Pertama, besarnya paket yang dikomunikasikan menjadi lebih kecil jika dibandingkan dengan protokol-protokol untuk sistem telepon, sehingga memungkinkan paket-paket dari pengguna yang berbeda yang melewati jaringan pada waktu yang bersamaan dapat dikelompokkan secara merata.[5] Karakteristik ATM yang kedua adalah mengingkatnya kecepatan, dari 25 hingga 155 Mbps.[5] Bahkan, peralatan ATM dapat menggabungkan 16 saluran menajadi satu untuk menghasilkan kecepatan transfer hampir sebesar 2,5 juta bit per detik.[5]
Contoh : International Telecommunication Union (ITU)


Kesimpulan Dari ke-4 Teknologi yang paling sering digunakan untuk pengolahan data adalah Packet Switching.

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