of Review Networking Basics
Yao Wang Polytechnic University, Brooklyn, NY11201 [e-mail]
These slides are extracted from the slides made by authors of the book (J. F. Kurose and K. Ross), available from the publisher site for instructors. We would like to thank the authors for the excellent book and the slides.
Slides based on Computer Networking: A Top Down Approach Featuring the Internet,
2nd edition. Jim Kurose, Keith Ross Addison-Wesley, July 2002. Chapters 1-2
From [Kurose/Ross]
Networking Basics
2
Overview of Telecommunication Networks and Internet
Based on Chapter I -- Computer Networks and the Internet
From [Kurose/Ross]
Networking Basics
3
Roadmap
What is the Internet? Network edge Network core Internet structure and ISPs Protocol layers, service models
From [Kurose/Ross]
Networking Basics
4
Whats the Internet: nuts and bolts view
millions of connected computing devices: hosts,
router server local ISP workstation mobile
end-systems
communication links
running network apps
fiber, copper, radio, satellite transmission rate =
PCs workstations, servers PDAs phones, toasters
regional ISP
routers: forward packets
(chunks of data)
From [Kurose/Ross]
bandwidth
company network
5
Networking Basics
Whats the Internet: nuts and bolts view
protocols control sending,
receiving of msgs
router server local ISP
workstation mobile
Internet: network of
networks
e.g., TCP, IP, HTTP, FTP, PPP
loosely hierarchical public Internet versus private intranet RFC: Request for comments IETF: Internet Engineering Task Force
regional ISP
Internet standards
company network
6
From [Kurose/Ross]
Networking Basics
A closer look at network structure:
network edge: applications and hosts network core:
routers network of networks
access networks, physical media: communication links
From [Kurose/Ross] Networking Basics 7
Network edge: connection-oriented service
Goal: data transfer
between end systems handshaking: setup (prepare for) data transfer ahead of time
TCP service [RFC 793]
stream data transfer
reliable, in-order byteloss: acknowledgements and retransmissions sender wont overwhelm receiver senders slow down sending rate when network congested
8
Hello, hello back human protocol set up state in two communicating hosts
flow control:
TCP - Transmission Control Protocol
congestion control:
Internets connectionoriented service
From [Kurose/Ross]
Networking Basics
Network edge: connectionless service
Goal: data transfer
between end systems
same as before!
Apps using TCP:
HTTP (Web), FTP (file transfer), Telnet (remote login), SMTP (email)
UDP - User Datagram Protocol [RFC 768]: Internets connectionless service unreliable data transfer...
network_overview_kurose