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TCP/IP Network Basics 7

Agilent Connectivity Guide 169

Internet Control Message Protocol (ICMP) Internet Control

Message Protocol (ICMP) is primarily used to send error messages,

perform diagnostics, and control data flow. You can also use ICMP with

the Packet InterNet Groper (

Ping) utility. To ping another host from a

Command Prompt, type

ping <ip_address>.

Example: Using ping for Echo Request

For example, you could use the Ping utility to send ICMP echo request

packets to the destination host and request the destination host return

these packets. If the packets are returned, you can assume the

connection is good. If the packets are not returned, a connectivity

problem exists. This figure shows an example return from pinging a

computer at IP address 156.140.72.1.

The Transport Layer

The Transport Layer of the TCP/IP model contains the protocols

responsible for addressing and routing of packets. The Transport Layer

determines if the sender and receiver will establish a connection before

communicating and how often acknowledgements of the connection are

sent. The protocols at the Transport Layer deliver data to and receive

Figure 58 Example Using Ping Utility

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Agilent Technologies E2094S Manual de Serviço Página 169