OBIETTIVI FORMATIVI

Architetture di rete, Livelli, Protocolli, Interfacce, Commutazione, Modello ISO-OSI, Livello Fisico, Analisi dei segnali, Topologie, Linee, Baud e bit rate, Sincronizzazione, Codici di linea, Livello Data Link, Framing, Controllo di errore e di flusso, Livello MAC, Ethernet, PPP. Livello Network, Routing, TCP/IP, IP, ARP, DHCP, TCP, UDP, protocolli di livello applicativo

OBIETTIVI FORMATIVI (DETTAGLIO) E RISULTATI DI APPRENDIMENTO

Al termine dl corso gli studenti:

1. Conosceranno le architetture di rete
2. Conosceranno i protocolli di rete
3. Saranno in grado di analizzare le Protocol Data Unit di reti basate su TCP/IP
4. Saranno in grado di scrivere semplici applicazioni in C in grado di scambiare dati sulla rete
5. Saranno in grado di progettare reti.

PREREQUISITI

1. Elementi di programmazione
2. Elementi di matematica e statistica 

MODALITA' DIDATTICHE

Lezioni frontali

PROGRAMMA/CONTENUTO

1. Il programma di dettaglio è il seguente:

2. Introduction & Terminology:
   • Standard Bodies
   • Circuit/Packet Switching,
   • LAN/WAN, Network Topolgies
   • Layering and Network Architecture (Layers, Entities, Protocol, Interface, PDU, Payload, Header, ….)
3. Modello ISO - OSI (7 layers)
4. Physical Layer:
   • Propagation Speed (from Maxwell Eq.)
   • Rate,  Fourier Analysis of a Bit Sequence, test on Excel
   • Digital Modulation (ASK, FSK, PSK, QAM)
   • Bit level Synchronization
   • Asynchronous, free running clocks,  Start/Stop bit, clock precision analysis .
   • Synhronous (Manchester, AMI (HDB3, B8ZS)), code examples.
   • Timed Division Multiplexing (TDM)
   • Frames and Frame Level Synchronization (time slots, Mux/Demux, T1)
   • Digital Telephony through PCM and DTM.
5. Data Link Layer:
   • Data Link Layer entities as Operating System Processes
   • Inter Process Communication
   • Positive Acknowledgement and Retransmission
   • Layer 2 Rate Analysis without/with errors (size, rate, distance, speed, error rate)
   • Window Flow Control (principle and pseudo-code)
   • Error Management
   • Error Detection (Parity and CRC)
   • Error Correction (basic limitations for single/double error correction)
   • Hamming Code for Single Error Correction
   • Point to Point Protocol, RFC and Finite State Machine Analysis
6. Medium Access Control (MAC Sublayer)
   • The Original Ethernet: CSMA/CD, principle of working, Collision Analysis
   • From Ethernet requirements to frame structure, padding to avoid undetected collisions 
   • Probabilistic analysis of Collisions and Ethernet Performance
   • From Shared Medium Ethernet to Switched Ethernet
   • Ethernet Switch Architecture
   • Ethernet Switch Controller, pseudo code analysis
   • Forwarding Tables
   • Data Plane (Frame Forwarding)
   • Control Plane (Learning)
   • Spanning Tree
7. Network Layer:
   • Routing and Routing Tables
   • Connection Oriented model (CO): Virtual Circuit, Routing Tables in the CO model
   • Connectionless model (CL): Datagram, Routing Tables in the CL model
   • Control Plane
   • Distance Vector (Bellman Ford Algorithm)
   • Shortest Path (Dijkstra Algorithm)
8. The Internet Protocol suite:
   • The TCP/IP – UDP/IP Reference Model, comparison with the OSI Reference Model
   • Applicable RFCs
9. Internet Protocol (IP):
   • IP Header analysis and relationships between header fields and functionalities.
   • IP Addresses, from the original Addressing Scheme to Subnetting and CIDR
   • IP Routing
   • Network/Port Address Translation (NAT/PAT)
10. Transmission Control Protocol (TCP):
    •  Header analysis and relationships between header fields and functionalities.
    • TCP Segment Structure and TCP Ports
    • Connection Establishment, 3-way Handshaking, Finite State Machine
11. User Datagram Protocol (UDP): Header analysis and relationships between header fields and functionalities.
    • Header analysis and relationships between header fields and functionalities.
    • UDP Segment Structure and UDP Ports
12. Additional Protocols in the TCP/IP Suite
    • ICMP
    • DHCP
    • ARP
    • DNS
13. The Application Layer in Internet
    • The Standard Application Layer (Web, Mail, Remote Login, File Transfer)
    • Programming Interface (Socket in C Language)
14. Laboratory
    • Wireshark base traffic analysis
    • Command Line based Network Configuration in Windows and Linux (ipconfig/ifconfig)
    • Linux emulation on MS Windows through Cygwin
    • Socket Programming in C language on client/server applications
    • putty (remote login) to access a remote server
    • scp to move files between local/remote servers

TESTI/BIBLIOGRAFIA

A. Tanenbaum, Computer Networks