Rekpro-20062-dws-02-intro To Networking

Rekayasa Protokol Kuliah 1 – Pengenalan Jaringan

Bayu Erfianto & Tri Brotoharsono Laboratorium Jaringan dan Sistem Komputer Teknik Informatika, STT Telkom

Rencana Pembelajaran • Topik: – – – –

Pengenalan Spesifikasi Layanan (Service) Spesifikasi Protokol Specification Tools: FSM,Petri Net, MSC, SDL, Lotos – Protocol Verification dengan SPIN/Promela – OSI Conformance Testing – Object-oriented Protocol Design

• Bobot Penilaian – 50% UTS – 50 % UAS

• Buku referensi: – Diktat Rekayasa Protokol – Referensi lainnya

Pokok Bahasan Kuliah 1 • Me-review komunikasi jaringan

Jaringan Komputer • Didesain untuk mengurangi kompleksitas • Menggunakan suatu set aturan (set of rule) untuk berkomunikasi  Protokol Jaringan • Protokol Jaringan: pengaturan suatu seri level atau stack (kelompok tingkatan)

Arsitektur Dasar Jaringan Komputer: Proses • Model client-server melibatkan request dan reply.

Aplikasi Jaringan • • • •

Akses secara remote (remote information) Komunikasi person-to-person Interactive entertainment Electronic commerce

Contoh Aplikasi Jaringan

Paradigma Baru: Mobile Network Users • Kombinasi jaringan tanpa kabel dan mobile computing.

Network Hardware: Topologi • • • • • •

Local Area Networks Metropolitan Area Networks Wide Area Networks Wireless Networks Home Networks Internetworks

Classification of interconnected processors by scale

Topologi Jaringan Broadcast • Bus

• Ring

Contoh: Cable Modems

Contoh: Wide Area Networks

Jaringan Wireless • Kategori jaringan wireless: – System interconnection – Wireless LANs – Wireless WANs

Apa itu Internet: • Jaringan dari jaringan: hubungan dari jutaan device komputer: host, end-system – PC, servers – PDA – Aplikasi jaringan

• Communication link – Fiber (FDDI), copper (UTP, cable model ethernet), radio (Wifl), satelit

• Router: mengirim paket (chunks) (dari data) melalui jaringan

Apa itu Internet: (lanjutan) • Protokol: control sending, receiving of messages – Cth: TCP, IP, HTTP, FTP, PPP

• Internet: "network of networks" – loosely hierarchical – public Internet versus private intranet

• Standarisasi Internet – RFC: Request for comments – IETF: Internet Engineering Task Force

Struktur Network: • network edge: applications and hosts • network core: – routers – network of networks

• access networks, physical media: communication links

The Network Edge: • end system (host): – run application program • e.g., WWW, email

– at "edge of network"

• client/server model – client host requests, receives service from server • e.g., WWW client (browser)/ server; email client/server

• peer-peer model: – host interaction symmetric • e.g.: Gnutella, KaZaA

Network Software • • • • •

Protocol Hierarchies Design Issues for the Layers Connection-Oriented and Connectionless Services Service Primitives The Relationship of Services to Protocols

Hirarki Protokol

Design Issues for the Layers • • • • •

Addressing Error Control Flow Control Multiplexing Routing

Arsitektur Internet

• Pertanyaan: Bagaimana mendeteksi tabrakan?

• Wireless networking with a base station.

• Ad hoc networking.

Wireless LAN (2)

• Area single radio tidak seluruhnya meraup area sistem

Wireless LAN (3)

Network Standardization • Telecommunications World • International Standards World • Internet Standards World

ITU • Main sectors – Radiocommunications – Telecommunications Standardization – Development

• Classes of Members – – – –

National governments Sector members Associate members Regulatory agencies

Protokol • Berisi suatu set penataan aturan pengartian dan format frame, packet, atau message yang saling bertukaran antara peer entities dalam suatu layer. • Protokol digunakan untuk berkomunikasi antara entity pada sistem. • Entity menggunakan protokol untuk mengimplementasikan service definition. • Kunci elemen protokol: – Syntax: Termasuk format data waktu dan level sinyal – Semantic: Termasuk informasi control and error handling.

Proses Rekayasa Protokol • Need for protocol engineering – Many protocols if not properly designed and implemented as per the requirements, leads to improper behavior of network and system may jam the networks. – Hence it is required to, engineer the protocols for their correctness reliability, optimized performance, reusability, and code optimization – Deals with application of formal techniques and software engineering methodologies to protocol design and implementation