UDP

AVP-2TRTS

AVP-2

TRTS

AVP-2TRTS

Abdullah Salem Hadadi

Abdullah Dafer Alshehry

Christian Stueer

Mr.

ICT-N

E-6

UDP

In 2 minutes, imagine this picture.Tell me what is talking about?

Introduction of UDP

User Datagram

Example for UDP application: Consideration of using UDP

Usage of UDP

TCP vs. UDP

Group Work

Characteristics of UDP

What is UDP?UDP is a connectionless and unreliable transport protocol. The two ports serve to identify the end points within the source and destination machines. User Datagram Protocol is used, in place of TCP, when a reliable delivery is not required. However, UDP is never used to send important data such as web-pages, database information, etc. Streaming media such as video,audio and others use UDP because it offers speed.

Position of UDP in the TCP/IP protocol suite

Characteristics of UDP

• Unreliable, connectionless delivery .• UDP uses a connectionless

communication setup. In this UDP does not need to establish a connection before sending data. Communication consists only of the data segments themselves.• Same best effort semantics as IP• No ack, no sequence, no flow control• Subject to loss, duplication, delay, out-of-order, or loss of connection.• Fast, low overhead

UDP packets, called user datagrams, have a fixed-size header of 8 bytes. Figure in the next slide shows the format of a user datagram.

User Datagram

User datagram format

A client-server application such as DNS uses the services of UDP because a client needs to send a short request to a server and to receive a quick response from it. The request and response can each fit in one user datagram. Since only one message is exchanged in each direction, the connectionless feature is not an issue;

Example for UDP application:

the client or server does not worry that messages are delivered out of order.

The consideration of using UDP• Reduce the requirement of

computer resources• The checking scheme has

provided completely by the application program

• When using the Multicast or Broadcast to transfer

• The transmission of Real-time packets

The usage of UDP

• Trivial File Transfer Protocol， TFTP

• Simple Network Management Protocol， SNMP

• Dynamic Host Configuration Protocol， DHCP

• Domain Name System， DNS• Routing Information Protocol，

RIP• Real-Time Transport Protocol，

RTP

Encapsulation and decapsulation

TCP vs. UDP

UDP TCP

connectionless connection-oriented

unconfirmed service confirmed service

(request, indication) (request, indication, response,

confirm)

low overhead high overhead

(header 8 octets) (header 20 octets)

no flow control flow control

Group Work

(Competition)

7 minutes

Quiz

5 min

utes