mcgraw-hill©the mcgraw-hill companies, inc., 2000 chapter 11 user datagram protocol (udp)

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Chapter 11

User DatagramProtocol(UDP)

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Figure 11-1

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Process-to-Process Communication

• Host-to-Host

• Process-to-Process

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Ports

• To define a process a port is needed.

• Tipos:– Ephemeral: random port number defined by the

client.– Well-known port number: defined port number

defined by the server.

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Figure 11-3

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Figure 11-4

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Figure 11-5

(Ephemeral)

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Socket Address

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UDP

• Conectionless, Unreliable.

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Format del Frame

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Checksum

• Incluye: Pseudoheader, UDP Header, Data Comming form the application layer.

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Example

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Operación

• Servicio Sin Conexión.

• NO tiene Control de Flujo.

• No tiene Control de Error

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Encapsulation

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Queues

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Multiplexing-Demultiplexing

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UDP Design

(keeptrack of the open ports)

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Chapter 12

Transmission Control Protocol

(TCP)

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Figure 12-1

McGraw-Hill ©The McGraw-Hill Companies, Inc., 2000

Process-to-Process Communication

• Host-to-Host

• Process-to-Process

McGraw-Hill ©The McGraw-Hill Companies, Inc., 2000

Ports

• To define a process a port is needed.

• Tipos:– Ephemeral: random port number defined by the

client.– Well-known port number: defined port number

defined by the server.

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Figure 12-3

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Well-known ports in TCP

Port Protocol

7 Echo

20 FTP, Data

21 FTP, Control

23 TELNET

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Figure 12-4

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Figure 12-25

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Figure 12-29

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Figure 12-30