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One of the main resposibilities of ICMP

题库2022-08-02  7
问题 One of the main resposibilities of ICMP is to report （  ）. Although technology has produced increasingly reliable transmission media, errors still exist and must be handled. IP is an （  ）protocol. This means that error checking and error control are not a concem ofIP.ICMP was designed, in part, to compensate for this shortcoming. Howerver, ICMP does not （  ）errors, it simply reports them. Error correction is left to the higher-level potocols. Error messages are always sent to the original（  ）because the only information available in the datagram about the route is the source and destination lP addresses. ICMP uses the source IP address to send the error massage to the source ofthe （  ）.A.datagramB.frameC.serviceD.protocol
选项 A.datagram
B.frame
C.service
D.protocol
答案 A
解析 ICMP其中一个主要的职责就是进行错误报告。 虽然现在技术发展已经有了日益可靠的传输媒体，但错误仍然存在，必须进行相应的处理。IP是一个不可靠的协议，这意味着错误检测和错误控制并不是IP所关注的。ICMP被设计成在某称程度上来弥补这个缺点，但是ICMP不更正错误，它只是简单的报告错误，误差修正留给高层次协议。错误消息总是送到原始出处，因为关于路由数据段中的仅有无效信息是在源和目的IP包中。ICMP发送错误消息给数据源时会使用到源IP地址。
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软件水平考试初中高级

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