IN-KOM-EVU, III forsamling
Tarik Čičić
University of Oslo
6-7 desember 2001
Welcome!
• What we are going to
do
• Course overview
Internet Multimedia
Mobility
Internet Multimedia
Mobility
2
Recent Developments in the IP World
• IP technology today experiences a
tremendous development:
– “exponential” growth
– boom of new services
– media convergence and integration
3
1
After IN-KOM-EVU …
… we will know:
– technological background for the modern IP
developments (and be surprised by how simple
the basic principles are!)
– gain an idea of what is realistic to expect in
coming 3-5 years
– have a working level of knowledge about the
cutting edge new technologies
(and be dissapointed by their simplicity)
4
Important!
5
The Internet
• Global data communication network
• focus of our course
• transports the “simplest” media type (which
was the last to get its network)
• tremendous growth
• predecessor of the future unified
communication network
6
2
History and size
• In 1969 the US department of defense
connects first four hosts in an internetwork
• first 20 years with mostly scientific research
• commercial explosion in 1990s
• today some 13 million hosts, 150 countries,
25-40 million users
>60 million users, all counties, everywhere
7
Attributes of the success (1)
• The Internet is based on TCP/IP
(Transmission Control Protocol / Internet
Protocol)
• IP is
– robust
– implemented on most platforms and network types
– makes a wide range of applications possible (file
transfers, e-mail, distributed calculation etc.)
8
Attributes of the success (2)
• Real explosion of the Internet happened
when the World Wide Web was introduced
• intuitive graphic user interface and
simplicity of operation was added to the
well known clientClients
server paradigm
Server
• global information
retrieval system
9
3
The Internet today
• Transmission of all “digitalable” media
• mobility
– users
– computers
• ubiquitous computing
• absorbing and enhancing the traditional
communication services
10
Data network and phone network
• Mail exchange and surfing: the Internet
• verbal conversation: telephony
• data is
– collected and encoded by a terminal device (keyboard,
microphone + microprocessor and memory)
– sent over electrical and optical links
– routed through switches
– decoded and reproduced in a remote terminal
• not so big difference?
11
Basics: OSI architecture
“Open System Interconnection”
Host
Host
HTTP
Application
Application
Presentation
Presentation
Session
Session
Transport
Transport
Network
IP
Router
Network
IP
Network
Data Link
Data Link
Data Link
Physical
Physical
12
Physical
4
Basics: Internet architecture
• Practical approach to layering (which we adopt
in this course)
Host
Host
Application
Transport
Application
Transport
Router
Network
Network
Network
Data Link
Data Link
Data Link
Physical
Physical
13
Physical
Basics: Data Packets
Header Payload
• Information packed in
the payload
• control information in
the header
• each layer adds its
header
HTTP
HTTP
TCP HTTP
IP
TCP HTTP
HTTP
HTTP
14
Basics: Internet properties
End-to-end packet
forwarding
Connectionless
Best effort
Packets have enough information to
reach the destination
Network core keeps no per-flow
state
No transmission guarantees
15
5
Network properties comparison
The Internet
End-to-end packet
forwarding
Connectionless
Line switching
Best effort
QoS Support
Timeless data (text,
pictures)
Real-time data (audio)
Connection oriented
Public
telephone network
16
Course Plan: Day 1
1.
2.
3.
4.
5.
6.
This introduction + exercise solution
IPv6
Multimedia services in the Internet
Real-time protocols
Wireless LAN (IEEE 802.11)
Mobile IP + VPNs
17
Course Plan: Day 2
1.
2.
3.
4.
5.
High performance routing
Multi-Protocol Label Switching
Integrated services and RSVP
Differentiated services
Multicast data transmission
18
6
Do not forget to …
19
7