Which field in Domain Name System message format specifies the class of query?

A. Type

B. Class

C. Rdlength

D. Rdata

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  3. In the IP address, what does 129.2 specify?
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  21. 80 is the well-known port number for the HTTP service.
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  28. _____________ command is used by the client to transfer the job across to the server.
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