School of Computer Science & Technology
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Computer Networking
A Top-Down Approach Featuring the Internet
计算机网络-自顶向下方法与Internet特色
Chapter1 Computer Networks and the Internet
Introduction
Chapter goal
get context, overview, and "feel" of computer networking
more depth, detail later in the course
approach:
descriptive
use Internet as example
roadmap
What is the Internet
The Network edge
The Network core
Access networks and physical media
ISPs and Internet backbones
Delay & loss in packet-switched networks
Protocol layers and their service models
History of networking and the Internet
1.1 What's the Internet
Nuts-and-bolts description
the basic hardware and software components that make up the Internet.
Computing devices, communication links, switches,……
A service description
describing the Internet in terms of a networking infrastructure that provides services to distributed applications.
Connection-oriented reliable service
Connectionless unreliable service
1 A Nuts-and-Bolts view
End systems
public Internet is a worldwide computer network that connects millions of computing devices
pc's workstations, servers, PDA's phones, even toasters.
hosts
The term computer network is being to sound a bit dated!
company
network
local ISP
regional ISP
router

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