Computer Networks Chapter 1

• Telecommunication: communication over a distance by cable, telegraph, telephone, or broadcasting
• Data communications send and receive data between devices via a transmission medium such as wire cable or wireless.

  1. Delivery: Correct destination
  2. Accuracy: Accurate data
  3. Timelines: Real-time transmission
  4. Jitter: Uneven delay
• Data representation: How data is stored in a computer system.

  1. Text
  2. Numbers
  3. Images
  4. Audio
  5. Video
• Data Flow:

  1. Simplex
  2. Half-duplex
  3. Full-duplex
• Networks: A network is a group of computers connected to share data and resources. (Computer, printer, or any other device capable of sending/ receiving data generated by other nodes of the network)
• Types of connections:

  1. Point to point: A dedicated link is provided between two devices.
  2. Multipoint: More than two specific devices share a single link.
• Physical Topology(A layout of nodes/computers):

  1. Mesh
  2. Star
  3. Bus
  4. Ring
  5. Tree
• Categories of networks:

  1. Local Area Network (LAN)
  2. Wireless Local Area Network (WLAN)
  3. Metropolitan Area Network (MAN)
  4. Wide Area Network (WAN)