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ICMP is primarily used for __________

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in Computer Network by (190k points)
ICMP is primarily used for __________

(a) error and diagnostic functions

(b) addressing

(c) forwarding

(d) routing

I have been asked this question in class test.

My enquiry is from Network Layer in chapter OSI Model of Computer Network

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Right choice is (a) error and diagnostic functions

To explain: ICMP abbreviation for Internet Control Message Protocol is used by networking devices to send error messages and operational information indicating a host or router cannot be reached. ICMP operates over the IP packet to provide error reporting functionality as IP by itself cannot report errors.

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