Network basics

Basics

• IP Addresss(Unique Identifier on Internet)

  • IPV4(32-bit) which owns 4.5 billion unique IP address
  • IPV6(128-bit) became popular since internet growth

• IP and Data Packets

  • data packet
    • header
      • source
      • destination
    • data(payload)
    • trailer
  • data is sent by dividing into multiple data packets

• TCP(Transmission Control Protocol)

  • Since data is divided into multiple data packets, TCP is used to ensure data packets are arrived in right sequence and reassembled correctly
  • IP ensures data is sent to right destination

• Application Data

  • HTTP request(POST,GET)

• Network Layer

  • IP - Network layer (Physical)
  • TCP - Transport layer
  • HTTP operates - Application layer

• Public and Private IP

  • Public IP is able to be accessed globally
  • Private IP is only reachable within LAN(Local Area Network)

• Static and Dynamic IP

  • Static IP is used by server side (Imagine your local file server),manually configured
  • Dynamic IP is often used by client side which is auto-configured

• Port

  • Port is used to distinguish multiple application or service that running on single device(Like database port, backend port, React.js port)