1
play

1 Course Course objectives objectives & limits & limits - PDF document

2004/2005


  1. ������������ ������������ ��������������� ��������������������� 2004/2005 ������� ���������������������������� ���������������� ��������������������������������������� ������������� �������������������������� ������ ����������������������� ������ �� ������� ���������!��� �� G. Bianchi, G. Neglia ����������� ����������� �������� �������� �� �� ��������� ����������������� �������� 1. transmission technologies � physical carriers, modulation, etc 2. data link protocols � reliable transfer of bits from point to point 3. Packet switching � Historical perspective, then technologies, routing, protocols, finally IP 4. Packet forwarding � Glue IP routing with layer 2, ARP,... 5. Transport protocols, application protocols � In a rush!! (just a bit of TCP, HTTP, …) G. Bianchi, G. Neglia �������� ������� �������� ������� ��� ������� ���� ������ ������ � (almost) Top-Down � Applications are indeed important � What you see is what you learn first � Start focusing on internet application programming � Notion and usage of sockets (JAVA examples) � Transport layer as application developement platform � Web as driving application � Limited details on other apps G. Bianchi, G. Neglia 1

  2. Course Course objectives objectives & limits & limits � ������� �!" � "��������������������������������#�����$������������������ � "������������ ��� ����� ��� ���� ���� �������� �� ���� ��� � � ������� ��������� �� ������� �� ������ %�������� ���� ��&�'�������� � #������ ���� �� ����(����� �� � �������� ����� � #�$��!" � � ����������� �� )*���+�������������#���,����������#��� %��� ������� �� ����-������� ������������������ �� . ����������� ���������� ������&� � /�������������� � ����� �� $��������%���������� �� �� ��� �������������& G. Bianchi, G. Neglia Teaching Material Material Teaching � Book and notes � Nicola Blefari Melazzi, dispense, versione 4.2 (in italian), 2003 � Available online � In progress (310 pages at the moment) � James F. Kurose, Keith W. Ross, 2000 � Italian version: Internet e reti di calcolatori, McGraw-Hill, approx 40 � � top-down approach � Additional reference books & material � Stevens (vol. 1), 1994 � to dip into technical issues � a VALUABLE book (though a bit too old) � RFCs: the real stuff… � Sites: � www.ietf.org � Internet standardization � www.w3.org � Web standardization G. Bianchi, G. Neglia Course contents Course contents � PART A: Applications � Internet architecture, internet standardization, switching basics � Application addressing, Internet applications development (JAVA-based) � World wide web; HTTPv1.0 details � Domain Name System � PART B: Transport � User Datagram Protocol � Introduction to TCP, pipelining, performance issues � TCP algorithms: (a) window flow control; (b) TCP error control; (c) TCP congestion control. � PART C: Network � IP addressing � IP packet forwarding (ARP), IP address assignment (RARP, DHCP) � Advanced IP addressing: subnetting & supernetting (CIDR) � IP and ICMP details � IP routing � extra Time? Never happened… G. Bianchi, G. Neglia 2

  3. Internet Internet traffic traffic growth growth (USA - - recent recent measurements measurements) ) (USA G. Bianchi, G. Neglia Traffic share share - - projections projections Traffic IP TRAFFIC MIX - P2P SCENARIO 100% SHARE OF TOTAL TRAFFIC 90% 80% 70% WEB PAGES 60% RICH MEDIA 50% P2P 40% S2S 30% 20% 10% 0% 2001 2002 2003 2004 2005 2006 2007 2008 source: Cohen Communications Group G. Bianchi, G. Neglia Why Why “ “All All” over IP? ” over IP? Packet 15 Times 1200 Greater Than Circuit PetaBytes per Month 1000 800 Telephony 600 Internet 400 200 0 97 98 99 00 01 02 Year End Source: M. Decina, 2000 G. Bianchi, G. Neglia 3

  4. Voice over IP Voice over IP – – deployment deployment (source: F. Carlini, november 2003) (source: F. Carlini, november 2003) � ITA: Fastweb � All-IP Voice service � ITA: Telecom Italia � 100% (!!) Telephone traffic, MI-RM-NA backbone is IP � Did you know? � International traffic � 12% of whole international traffic is IP � Ongoing direction: � User VoIP awareness (e.g. Fastweb) G. Bianchi, G. Neglia What was was the Internet the Internet What ( for ) ( ago ) for the mass the mass- -media, a few media, a few years years ago � Internet synonimous of WWW ( W orld W ide W eb) sites & pages: � millions of documents � Spreaded worldwide � mostly written in HTML language ( HyperText Markup Language ) � mostly accessible via the HTTP protocol ( HyperText Transfer Protocol ) G. Bianchi, G. Neglia What was was the Internet the Internet What ( for ( in the 80s ) ) for the the scientist scientist in the 80s � Internet synonimous of FTP ( F ile T ransfer P rotocol) and e-mail: � Scientists were the only ones having a presence on the Internet (unix logins) » contacts via email, talk program � Research documents archived in FTP sites » accessible via FTP, gopher � Scientific (and cultural) forums: Usenet news G. Bianchi, G. Neglia 4

  5. What What is is the internet the internet ( for ) ( for the mass media, the mass media, today today ) � Huge marketplace for e-business � B2B and B2C portals with full-fledged transaction capabilities � Virtual communities � Chat & messaging � Peer to peer applications � Communication network � IP Telephony / Multimedia commun. G. Bianchi, G. Neglia What will will be be the Internet the Internet What (in 2010?) (in 2010?) � High speed unique integrated telecommunication network and business services platform � High Speed = Broadband � Unique = integrated services network � Services = from communication to distributed systems � ??? � Worldwide operating system? � Content delivery network? p2p? ??? � Internet Appliances, the real revolution? ??? G. Bianchi, G. Neglia What What is is the Internet the Internet (For For networking networking engineers engineers: : We We!) !) ( 1. A worldwide computer network � Connecting end-systems (host, servers) � Each uniquely identified by a numeric address (IP address) 2. the world wide group of networks combined with TCP/IP � TCP/IP synonimous of the entire suite of networking protocols. � The name comes from the two most important: » TCP = Transmission Control Protocol » IP = Internet Protocol 3. A packet switching network G. Bianchi, G. Neglia 5

  6. TCP/IP characteristics TCP/IP characteristics � TCP/IP provides services necessary to create the Internet, by: � interconnecting computers & � interconnecting networks � Independence from underlying network topology, physical network hardware, Operating Systems, etc � Universal connectivity throughout the network � Standardize High Level protocols G. Bianchi, G. Neglia What Internet What Internet is is: a network of : a network of heterogeneous networks networks heterogeneous Internet and host Private Nets Token router %�&�� ����� router Power- &��'&��� Ring line central !�������� ���' Power Ethernet line Host = 1 interface Router = 2+ interfaces G. Bianchi, G. Neglia What Internet What Internet attempts attempts to to be be ( (but but only only loosely loosely is is): ): a hierarchical hierarchical network... network... a G. Bianchi, G. Neglia 6

Download Presentation
Download Policy: The content available on the website is offered to you 'AS IS' for your personal information and use only. It cannot be commercialized, licensed, or distributed on other websites without prior consent from the author. To download a presentation, simply click this link. If you encounter any difficulties during the download process, it's possible that the publisher has removed the file from their server.

Recommend


More recommend