Which of the following are controlled-access protocols? A. Reservation B. P...

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Question Id : 14530 | Context : UGC NET Computer Science 26 June 2025 (Paper II)

Which of the following are controlled-access protocols? A. Reservation
B. Polling
C. TDMA
D. Token Passing
E. CSMA/CA Choose the correct answer from the options given below:

Protocol	Type	Explanation
A. Reservation	Controlled Access	Stations reserve the channel for transmission before sending data.
B. Polling	Controlled Access	A central controller polls each station to determine if it has data to send.
C. TDMA (Time Division Multiple Access)	Channelization	Divides the channel into time slots — not part of controlled access.
D. Token Passing	Controlled Access	A special token is passed between stations; only the holder can transmit.
E. CSMA/CA	Random Access	Uses collision avoidance — it’s a contention-based protocol, not controlled access.

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