CH1

CH1：Internet、Network Edge、The Network Core、Protocol Layers and Their Service Models、Networks Under Attack……

CH1

• Internet
  • The Internet is a computer network that interconnects billions of computing devices throughout the world.
    • communication links
    • packet switches
    • transmission rate
    • packets
    • End systems access the Internet through Internet Service Providers
  • Protocols
    • Transmission Control Protocol (TCP)
    • Internet Protocol (IP)
  • distributed applications
• Network Edge
  • Access Networks
    • Home Access: DSL, Cable, FTTH, Dial-Up, and Satellite
    • Access in the Enterprise (and the Home): Ethernet and WiFi
    • Wide-Area Wireless Access: 3G and LTE
  • Physical Media
    • Twisted-Pair Copper Wire
    • Coaxial Cable
    • Fiber Optics
    • Terrestrial Radio Channels
    • Satellite Radio Channels
• The Network Core
  • Packet Switching
    • In a network application, end systems exchange messages with each other.
    • Store-and-Forward Transmission
      • Most packet switches use store-and-forward transmission at the inputs to the links.
      • Queuing Delays and Packet Loss
        • store-and-forward delays
        • queuing delays
      • Forwarding Tables and Routing Protocols
  • Circuit Switching
    • circuit switching
    • packet switching
  • A Network of Networks
• Delay, Loss, and Throughput in Packet-Switched Networks
  • Overview of Delay in Packet-Switched Networks
    • nodal processing delay
    • queuing delay
    • transmission delay
    • propagation delay
    • Comparing Transmission and Propagation Delay
  • Queuing Delay and Packet Loss
    • Packet Loss
  • End-to-End Delay
    • dend-end = N(dproc + dtrans + dprop)
    • End System, Application, and Other Delays
  • Throughput in Computer Networks
• Protocol Layers and Their Service Models
  • Layered Architecture
    • Protocol Layering
    • Application Layer
    • Transport Layer
    • Network Layer
    • Link Layer
    • Physical Layer
    • The OSI Model
  • Encapsulation
• Networks Under Attack
  • The Bad Guys Can Put Malware into Your Host Via the Internet
    • self-replicating
    • Viruses
    • Worms
  • The Bad Guys Can Attack Servers and Network Infrastructure
    • denial-of-service (DoS) attacks
    • distributed DoS (DDoS)
  • The Bad Guys Can Sniff Packets
  • The Bad Guys Can Masquerade as Someone You Trust
    • IP spoofing
• History of Computer Networking and the Internet
  • 1961–1972
    • The Development of Packet Switching
  • 1972–1980
    • Proprietary Networks and Internetworking
  • 1980–1990
    • A Proliferation of Networks
  • The 1990s
    • The Internet Explosion
  • The New Millennium