Data Communication and Networking

Subdecks (7)

Cards (130)

  • Hosts or end systems are devices that are being hooked up to the internet
  • End systems are connected together by a network of communication links and packet switches.
  • What is a transmission rate?

    The rate at which data is transmitted over a network.
  • What is transmission rate measured in?
    Bits per second (bps)
  • What are packets?

    Units of data that are transmitted over a network.
  • The two most prominent packet switches in today's Internet are routers and link-layer switches.
  • The sequence of communication links and packet switches traversed by a packet from the sending end system to the receiving end system is known as a route or path through the network.
  • Packets can be compared to trucks.
    Communication links can be compared to highways and roads.
    Packet switches can be compared to intersections.
    End systems can be compared to buildings.
  • End systems access the Internet through Internet Service Providers (ISPs)
  • End systems, packet switches, and other pieces of the Internet run protocols that control the sending and receiving of information within the Internet.
  • The Transmission Control Protocol (TCP) and the Internet Protocol(IP) are two of the most important protocols in the internet.
  • The IP protocol specifies the format of the packets that are sent and received among routers and end systems.
  • The Internet's principal protocols are collectively known as TCP/IP.
  • Internet standards are developed by the IETF.
  • The IETF documents are called RFCs (Request for Comments)
  • Internet applications are known as distributed applications, since they involve multiple end systems that exchange data with each other.
  • Internet applications run on end systems - they do not run in the packet switches in the network core.
  • Packet switches facilitate the exchange of data among end systems, they are not concerned with the application that is the source or sink of the data.