lect11a_networks_Ross

lect11a_networks_Ross - Communication Networks and the...

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1 Communication Networks and the Internet Lecture 11a what’s the Internet? • network core: packet/circuit switching • what’s a protocol? • protocol layers, service models *The slides are adapted from ppt slides (in substantially unaltered form) available from “Computer Networking: A Top-Down Approach,” 4 th edition, by Jim Kurose and Keith Ross, Addison-Wesley, July 2007. Part of the materials are also adapted from MIT 6.02 course notes.
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2 From Links to Networks Your Networks Here! Your Networks Here! So far, we’ve learned about tools to help us communicate over a point-to-point link Digital modulation Channel-coded bits
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3 The bigger picture of the complete communication network and the Internet • millions of connected computing devices: hosts = end systems • running network apps Home network Institutional network Mobile network Global ISP Regional ISP router PC server wireless laptop cellular handheld wired links access points communication links • fiber, copper, radio, satellite • transmission rate = bandwidth routers: forward packets (chunks of data) ISP: internet service provider
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4 What’s the Internet: “nuts and bolts” view The individual connecting links: Utilizing Digital Modulation, Coding etc Protocols control sending, receiving of msgs • e.g., TCP, IP, HTTP, Skype, Ethernet Internet: “network of networks” • loosely hierarchical • public Internet versus private intranet Home network Institutional network Mobile network Global ISP Regional ISP
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5 What’s a protocol? human protocols: • “what’s the time?” • “I have a question” • introductions … specific msgs sent … specific actions taken when msgs received, or other events network protocols: • machines rather than humans • all communication activity in the Internet are governed by protocols protocols define format, order of msgs sent and received among network entities, and actions taken on msg transmission, receipt
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6 What’s a Protocol? A human protocol and a computer network protocol: Q: Other human protocols? Hi Hi Got the time? 2:00 TCP connection request TCP connection response Get http://www.awl.com/kurose-ross <file> time
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7 The Network Core • Mesh of interconnected routers the fundamental question: how is data transferred through net? • circuit switching: dedicated circuit per call: telephone net • packet-switching: data sent thru net in discrete “chunks” (Phone networks also now moving to this model)
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8 Network Core: Circuit Switching End-end resources reserved for “call” • link bandwidth, switch capacity • dedicated resources: no sharing • circuit-like (guaranteed) performance • call setup required
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This note was uploaded on 01/28/2011 for the course ELEC 300U taught by Professor Rossmurchandaminebermak during the Fall '08 term at HKUST.

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lect11a_networks_Ross - Communication Networks and the...

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