Suppose users share a 25 Mbps link. Also suppose each user transmits continuously at 5 Mbps when transmitting, and each user transmits only 20 percent of the time. When circuit switching is used, how many users can be supported

Two users have been supported as each user has half of the link bandwidth.

Explanation:

Two users require 1Mbps when transmitting, and fewer users transfer a maximum of 2 Mbps, and the available bandwidth of the shared link is 2 Mbps; there will be no queuing delay before connection. If three users, transmit, then bandwidth will be 3Mbps, and there will be queuing delay before the link. Link size = 2Mpbs, i.e. two users ,transmit, then a maximum of 2Mbps will require and does not exceed 2Mbps of bandwidth.

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