回送流程将包括两个基本任务—通过receive活动接收一条消息以及通过reply活动向发送方作出应答。
The echo process will consist of two primitive tasks — receiving a message via the receive activity and replying to the sender via a reply activity.
包因特网查询工具用于通过发送一个Internet控制消息协议回送请求并等待应答来测试一个特定网络目的地是否联机的一种程序。
Packet Internet Groper a program used to test whether a particular network destination is online, by sending an Internet control message protocol echo request and waiting for a response.
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