文档介绍：Chapter 1 Introduction
Jim Kurose, Keith Ross
Introduction 1-1
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Introduction
CHAPTER 1: INTRODUCTION
Our goal:
get “feel” and terminology
more depth, detail later in course
approach:
use as example
Overview:
what’s the ?
what’s a protocol?
network edge; hosts, , physical work core: packet/circuit switching, structure
performance: loss, delay, throughput
security
protocol layers, service models
history
Introduction 1-2
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Introduction
CHAPTER 1: ROADMAP
What is the ?
edge
end systems, works, links
core
circuit switching, packet switching, network structure
Delay, loss and throughput in packet-works
Protocol layers, service models
under attack: security
History
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Introduction
WHAT’S THE : “NUTS AND BOLTS”
millions of puting devices: hosts = end systems
work apps
work
work
work
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)
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Introduction
“FUN” APPLIANCES
IP picture frame
/
Web-enabled toaster +
weather forecaster
phones
refrigerator
Slingbox: watch,
control cable TV remotely
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6
WORK
Introduction
THE OF THINGS
MOBILE + SMART PHONE
8
WHAT’S THE : “NUTS AND BOLTS” VIEW
protocols control sending, receiving of msgs
., TCP, IP, HTTP, Skype,
: “network works”
loosely hierarchical
public versus private
standards
RFC: Request ments
IETF: Engineering Task Force
work
work
work
Global ISP
Regional ISP
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Introduction
WHAT’S THE : A SERVICE VIEW
communication infrastructure enables distributed applications:
Web, VoIP, email, games, merce, file munication services provided to apps:
reliable data delivery from source to destination
“best effort”(unreliable) data delivery
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