University:
York University
Course:
AP/ITEC 1610 | Introduction to Computer Programming
Academic year:

2023
Views:

278

Pages:

2
Author:

Nick T.

Networks What is the Internet •Infrastructure that provides services to applications and programming interface to distributed applications Protocol Layers Protocol: Rules for messages sent, an specific actions taken when message's are received or other events Layer: each layer implements a service, relying on services provided by the layer below Why use layered protocol? -Structured and organized in design and implementation -modularity, interoperability, abstraction, ease of trouble- shooting, flexibility, standardization Internet Protocol Stack Application: supports network applications (HTTP) Transport: process-process data transfer (TCP, UDP) Network: routing of datagrams from source to dest (IP, routing) Link: data transfer between neighbouring network elements (ethemet) Physical: bits "on the wire" → doesn't include presentation/session layers of ISO Nut Bolts of the Intermet •hosts: end systems • internet: intet connected ISPs •networks: collection of devices/routers/links, managed by an organization ·communication links: fiber, copper, radio, satellite •infrastructure: underlying framework and components -physical hardware, software, protocols, communication tech Connect end systems to edge routers •residential access • institutional access networks • mobile access networles (wifi, 46/56)