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Wireless Mobile Communications
Network Protocols
Q
In IPv4, service type of service in header field, first 3 bits are called ______
AA. Type of service
BB. Code bits
CC. Sync bits
DD. Precedence bits
Correct Answer:
D. D. Precedence bits
Explanation:
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.