Networking background

Security in Computing (3rd Edition)

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1 Background & Review of Communication Fundamentals CS 161/194-1 Anthony D. Joseph September 9, 2005 September 9, 2005 CS161 Fal 2005 Joseph/Tygar/Vazirani/Wagner 2 Outline • Communications Network Taxonomy – Packet Networks • The Internet • Transport Layer: UDP/IP, TCP/IP • Network Service Examples • P2P applications Many slides courtesy of EE 122 (Stoica/Katz) September 9, 2005 CS161 Fal 2005 Joseph/Tygar/Vazirani/Wagner 3 What is a Communication Network? (End-system Centric View) Network offers one basic service: move information – Bird, fire, messenger, truck, telegraph, telephone, Internet … What distinguish different types of networks? – The services they provide, security, … What distinguish the services? – Latency – Bandwidth – Loss rate – Number of end systems – Service interface (how to invoke the service?) – Others • Reliability, unicast vs. multicast, real-time. .. What are the security issues? – Authentication, privacy, anonymity, integrity, … September 9, 2005 CS161 Fal 2005 Joseph/Tygar/Vazirani/Wagner 4 What is a Communication Network? (Infrastructure Centric View) Communication medium: electron, photon Network components: – Links – carry bits from 1 place to 1 or more: fiber, copper, wireless,… – Interfaces – attach devices to links – Switches/routers – interconnect links: electronic/optic, crossbar/Banyan – Hosts – communication endpoints: PCs, PDAs, cell phones, toasters Protocols – rules governing communication between nodes TCP/IP, ATM, MPLS, SONET, Ethernet, X.25 Applications: Web browser, X Windows, FTP, . .. Low-level security issues: – Authentication, privacy, integrity, … September 9, 2005 CS161 Fal 2005 Joseph/Tygar/Vazirani/Wagner 5 Network Components (Examples) Fibers Coaxial Cable Links Interfaces Switches/routers Ethernet card Wireless card Large router Telephone switch September 9, 2005 CS161 Fal 2005 Joseph/Tygar/Vazirani/Wagner 6 Communication networks can be classified based on the way in which the nodes exchange information: Taxonomy of Communication Networks Communication Network Switched Communication Network Broadcast Communication Network Circuit-Switched Communication Network Packet-Switched Communication Network Datagram Network Virtual Circuit Network
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2 September 9, 2005 CS161 Fal 2005 Joseph/Tygar/Vazirani/Wagner 7 • Broadcast Communication Networks – Information transmitted by any node is received by every other node in the network • Examples: usually in LANs (non-switched Ethernet, WiFi) • Switched Communication Networks – Information transmitted to a sub-set of designated nodes • Examples: WANs (Telephony Network, Internet), switched Ethernet – Problem: how to forward information to intended node(s)? • Done by special nodes (e.g., routers, switches) executing routing protocols • Can the routing process be subverted?
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This note was uploaded on 01/29/2008 for the course CS 194 taught by Professor Joseph during the Fall '05 term at Berkeley.

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Networking background - Outline Communications Network...

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