Another option is to use a higher-level protocol to ensure that the same format is used for encoding and decoding.
另一选择是使用较高级别的协议以确保使用同一格式进行编码和解码。
ICMP USES the basic support of IP as if it were a higher level protocol.
ICMP使用IP的基本支持，就好象是更高级别的协议。
This service is used by the next higher level protocol: the Internet protocol (IP).
高一级别的协议—网际协议(IP)使用这一服务。
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