Security in Computing (3rd Edition)

Info icon This preview shows pages 1–3. Sign up to view the full content.

View Full Document Right Arrow Icon
1 Background & Review of Communication Fundamentals CS 161/194-1 Anthony D. Joseph September 9, 2005 September 9, 2005 CS161 Fall 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 Fall 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 Fall 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 Fall 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 Fall 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
Image of page 1

Info icon This preview has intentionally blurred sections. Sign up to view the full version.

View Full Document Right Arrow Icon