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In IPv4, service type of service in header field, first 3 bits are called ______

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In IPv4, service type of service in header field, first 3 bits are called ______

(a) Type of service

(b) Code bits

(c) Sync bits

(d) Precedence bits

The question was asked in final exam.

I'm obligated to ask this question of Network Protocols topic in division Network Protocol of Wireless/Mobile

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The correct answer is (d) Precedence bits

For explanation I would say: The 8-bit ToS (type of service) in IPv4 uses 3 bits for IP Precedence, 4 bits for ToS with the last bit not being used. The 4-bit ToS field, although defined, has never been used.

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