Fundamentals of Communication Networks
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1 Politecnico di Milano Scuola di Ingegneria Industriale e dell Informazione Fundamentals of Communication Networks Prof. Antonio Capone
2 Teacher o Prof. Antonio Capone o Office: n Dip. di Elettronica, Informazione e Bioingegneria - DEIB n 3 piano n stanza 335 o Tel: ( ) 3449 o [email protected] o Web page: n o Office hours: n Martedì
3 Exams o Written and oral exam n 4 Numerical exercises n 1 Set of questions n Oral exam if written score >=15
4 Teaching material (1) o Reference books: n A. S. Tanenbaum, D. J. Wetherall, Computer Networks, Fifth Edition, Pearson n James F. Kurose, Keith W. Ross, Computer Networking: a top down approach, Editore: Pearson
5 Teaching material (2) o Other books n Saadawi Tarek N., Ammar Mostafa H., El Hakeem Ahmed, Fundamentals of telecommunication networks Wiley n Fred Halsall, Data Communications, Computer Networks, and Open Systems Addison-Wesley n Behrouz A. Forouzan, TCP/IP protocol suite, McGraw-Hill n Douglas E. Comer, Internetworking with TCP/IP, Addison-Wesley
6 Teaching material (3) o Lecture slides o Other material and links o Course web site
7 Course home page
8 Course objetive o Provide you the basics of computer networks o Present you the building blocks of the Internet This basic knowledge is fundamental for the advanced topics covered by most of the other courses of the MSc program
9 Background Software applications exchange information with remote applications For communicating they use: The INTERNET o We will deal with: n How to support communications n Protocols used at different layers n Network infrastructures Communications uses physical media and are subject to rules (protocols)
10 Probability Theory o In addition to Communication Networks, the course provides also the basics of probability theory o This is instrumental to some advanced course of networking like Traffic Theory, but also to other courses of the study program
11 Course program o Basics of probability theory n Probabilities o o o o o Definitions Uniform spaces Conditional spaces Bayes Formulas Statistical independence n Random Variables o o o o o o o Spaces with infinite outcomes Continuous Random Variables Discrete Random Variables Moments of a pdf Conditional distributions and densities Vectorial Random Variables Functions of Random Variables
12 Course program o Functional models n Protocols n Communication services n Stack models and main functions o Physical layer n Multiplexing n Multiple access n Transport networks o Link layer n Framing n Error control n Retransmission n Flow control n Link protocol example (HDLC)
13 Course program o Local Area Networks n Random access n Ethernet n Bridging o Internet architecture o Network layer: IP n Addressing n Forwarding and routing n Control protocols n Routing protocols
14 Course program o Transport layer n UDP n TCP o Application layer n Name management: DNS n File transfer: FTP n Web Browsing: HTTP n (SMTP) n Peer-To-Peer applications o Private networks n Private addressing n Tunnels n NAT o MPLS o IPv6
15 Politecnico di Milano Scuola di Ingegneria Industriale e dell Informazione Introduction Fundamentals of Communication Networks
16 A bit of history
17 The born of the Internet: 60s o 1961: Kleinrock shows the effectiveness of packet switching with queuing theory o 1967: Lawrence Roberts designs ARPAnet (Advanced Research Projects Agency) o 1969: first network node IMP (Interface Message Processor) di ARPAnet at UCLA
18 o 1972: n n n o 1970: n o 1974: n The born of the Internet: 70s NCP (Network Control Protocol) the first Internet protocol First application ARPAnet has 15 nodes ALOHAnet radio packet network at Univ. of Hawaii Cerf and Kahn design internetworking (network of networks) principles o 1976: n Ethernet is designed in the Xerox labs o 1979: n ARPAnet has 200 nodes
19 The born of the Internet: 80s o 1982: SMTP for is defined o 1983: TCP/IP suite replaces NCP o 1983: DNS is defined for mapping of names and addresses o 1985: FTP protocol o 1988: congestion control of TCP o New national networks: Csnet, BITnet, NSFnet, Minitel o hosts
20 First applications o Telnet o o FTP
21 The born of the Internet: 90s o 1990: ARPAnet is discontinued o 1991: NSF allows commercial use of NSFnet o First 90s: Tim Berners- Lee invents the web at Cern in Genève o 1994: First browser Mosaic, then Netscape o End of 90s: explosion of commercial use of the Web
22 The born of the Internet: 2000s 2000s: o New killer applications : instant messaging, P2P file sharing, IP Telephony, social networks o Network security o Billions of users o Link speeds up to few Gbps Shawn Fanning Zuckerberg Diffie-Hellman-Merkle
23 The born of the Internet: 10s 10s - today: o Mobile internet o iphone o Android o Application markets
24 24
25 World is small
26 Internet growth Jul ,230,757
27 Internet vs mobile networks Per 100 inhabitants o 96 mobile subscribers o 16 fixed lines o 39 internet users o 10 fixed-broadband o 29 mobile-broadband Source: ITU Data: 2012
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