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NWC201 - Introduction (Overview (Performance: loss, delay, throughput,…

- - - - Rourter drop packet
  - - - Queuing Delay
      - Transmission Delay
      - Processing delay
      - Propagation delay
- - - - Circuit Switching
      - Packet Switching
        
        Allow more user to use network
- - - - The Internet is a network that interconnects hundreads of milions of computing divices throught the world.
      - Network of networks
    - - The Internet is an infrastructure that provides services to applications.
  - - - A protocol defines the format and the order of messages exchanged between two or more communicating entities, as well as the actions taken on the transmission and/or receipt of a message or other event.
- - - - Cable
      - FTTH
      - DSL - Digital Subcriber Line
      - Dial-up
      - Satellite
    - - Ethernet
      - WIFI
        Wireless LAN
        IEEE 802.11 technology
    - - 3G
        third-generation (3G) wireless
      - LTE
        a fourth-generation (4G)
  - - - Coaxial cable
      - Fiber optics
      - Twisted-Pair Copper Wire
        
        Unshielded twisted pair (UTP)
        
        Shielded twisted pair (STP)
    - - Satellite Radio Channels
      - Terrestrial Radio Channels
- - - - Network
        
        Datagrams
        
        Move network packet from one host to another host
        
        Protocol
        
        IP
        
        transport data
        
        Routing protocol
      - Link
        
        Move one packet from one node to the next node in the route
        
        Frame
        
        a datagram may be handled by different link-layer protocols at different links along its route
      - Transport
        
        Transport application-layer
        messages between two application
        
        Protocol
        
        UDP
        
        TCP
        
        Segment
      - Physical
      - Application
        
        Network Applications
        
        Protocol
        
        SMTP
        
        FTP
        
        HTTP
        
        DNS
        
        message
    - - Presentation
      - Session
      - Application
      - Transport
      - Network
      - Link
      - Physical
- - - - denial-of-service (DoS) attacks
        
        Categories
        
        Bandwidth flooding
        
        Vulnerability attack
        
        Connection flooding
      - distributed DoS (DDoS)
    - - packet sniffer
    - - malware
        
        Viruses
        
        Botnet
        
        Worm
        
        malwarre is self-replicating
    - - IPspoofing