UDP

Today, I learned about the TCP/UDP model. 

First, I would like talk about the UDP.

 

Before talking about the UDP, I want to reviewed the daily network strucutre!

This is how our network form using TCP model. In the chat room project, I learned that most interactive software program use the TCP!

 

Then, what is UDP?

UDP: User Datagram Protocol

• "Best effort" service, UDP segments may be:
  • Lost
  • Delivered out-of-order to app
• Connectionless:
  • No connection establishment
  • No handshaking between UDP sender, receiver
  • Each UDP segment handled independently of others

 

Here is the question: Which applications use UDP?

1. DNS
2. DHCP
3. SNMP
4. Streaming multimedia apps (loss tolerant, rate sensitive)

This picture explains about the segment header of UDP