Agilent Technologies Agilent E5810A Guia do Utilizador descarregar pdf (Página 149)

149

TCP/IP Network Basics

TCP/IP Protocols

As each packet is sent from the source host, an acknowledgement of

receipt is sent by the destination host within a specified time. If the

acknowledgement is not sent within this time, the sender re-sends the

packet.

If the receiver gets the packet in a damaged condition, the packet is

discarded and the receiver sends no acknowledgement. In this case, since

an acknowledgement was not received in the specified time, the sender re-

sends the packet. This figure shows a network in which the source and

destination are using TCP and summarizes the steps to use TCP for

communication between hosts.

User Datagram

Protocol (UDP)

User Datagram Protocol (UDP) is used for connectionless, non-guaranteed

communication. Unlike TDP, UDP does not set up a connection and does

not use acknowledgements. Instead, UDP sends out packets without waiting

for acknowledgement from the destination.

Router

Source Destination

Steps

1. Source sends a packet to destination to set up communication.

2. Destination sends acknowledgement to establish communication.

3. Source sends another packet that confirms connection.

4. Source sends a data packet and waits for destination acknowledgement.

5. If acknowledgement is not received, source re-sends the packet.

If acknowledgement is received, source sends the next packet.

TCP Communication

1 2 ... 144 145 146 147 148 149 150 151 152 153 154 ... 191 192

Sem comentários

Agilent Technologies Agilent E5810A Guia do Utilizador Página 149