Introduction
1-1
EEE 459 Communication
Networks
Spring 2007
Prof. M. Reisslein
Chapter 1
Introduction
Textbook:
Computer Networking: A Top
Down Approach Featuring the
Internet,
3
rd
edition.
Jim Kurose, Keith Ross
Addison-Wesley.

Introduction
1-2
Chapter 1: Introduction
Our goal:
get “feel” and terminology
moredepth, detail later in
course
approach:
❍
useInternet as example
Overview:
what’s theInternet
what’s a protocol?
network edge
network core
access net, physical media
Internet/ISP structure
performance: loss, delay
protocol layers, servicemodels
network modeling

Introduction
1-3
Chapter 1: roadmap
1.1 What is theInternet?
1.2
Network edge
1.3
Network core
1.4
Network access and physical media
1.5
Internet structureand ISPs
1.6
Delay & loss in packet-switched networks
1.7
Protocol layers, servicemodels
1.8
History

Introduction
1-4
What’s the Internet: “nuts and bolts” view
millions of connected computing
devices:
hosts = end systems
running
network apps
communication links
❍
fiber, copper, radio, satellite
❍
transmission rate =
bandwidth
routers:
forward packets (chunks
of data)
local ISP
company
network
regional ISP
router
workstation
server
mobile

Introduction
1-5
What’s the Internet: “nuts and bolts” view
protocols
control sending, receiving
of msgs
❍
e.g., TCP, IP, HTTP, FTP,
PPP
Internet: “network of networks”
❍
loosely hierarchical
❍
public Internet versus private intranet
Internet standards
❍
RFC: Request for comments
❍
IETF: Internet Engineering Task
Force
local ISP
company
network
regional ISP
router
workstation
server
mobile

Introduction
1-6
What’s the Internet: a service view
communication infrastructure
enables distributed applications:
❍
Web, email, games, e-commerce, file
sharing
communication services provided
to apps:
❍
Connectionless unreliable
❍
connection-oriented reliable

Introduction
1-7
What’s a protocol?
human protocols:
“what’s thetime?”
“I havea question”
introductions
… specific msgs sent
… specific actions taken when
msgs received, or other
events
network protocols:
machines rather than humans
all communication activity in
Internet governed by protocols
protocols define format, order of msgs
sent and received among network
entities, and actions taken on msg
transmission, receipt

Introduction
1-8
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
req
TCP connection
response
Get
<file>
time

Introduction
1-9
Chapter 1: roadmap
1.1
What is theInternet?
1.2 Network edge
1.3
Network core
1.4
Network access and physical media
1.5
Internet structureand ISPs
1.6
Delay & loss in packet-switched networks
1.7
Protocol layers, servicemodels
1.8
History

Introduction
1-10
A closer look at network structure:
network edge:
applications and hosts
network core:
❍
routers
❍
network of networks
access networks, physical
media:
communication
links


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