# UDP

It's a layer 4 protocol of OSI. It's much lighter than TCP.

# Pros

  • Smaller Packets - less bandwidth
  • Fast - due to less features and smaller packets
  • Stateless - no connection needed, sender just sends data. If the server restarts, it will continue receiving the data.

# Cons

  • No Acknowledgment - the sender does not know if the receiver received the bytes. Hence, there's no delivery guarantee
  • Connectionless
  • No Congestion Control - UDP will send packets no matter what the traffic is
  • No Ordering - packets may be received out of order
  • Low Security - due to connectionless nature, receiver does not know anything about the sender. Some firewalls disable UDP due to it.
Last Updated: 11/28/2022, 9:27:43 AM