Discussion
Which mechanism in transport layer supplies multiple network connections along with the distribution of traffic over them in a round-robin basis/fashion ?
Answer: B
The mechanism is Downward Multiplexing.
In downward (inverse) multiplexing a single transport connection is spread over several network connections, with traffic distributed among them in round-robin fashion. It is used to get more bandwidth than one network connection can provide.
Upward multiplexing is the reverse: several transport connections share one network connection. Buffering and flow control match the sender's rate to the receiver's capacity, and crash recovery deals with host or router failures, so neither distributes traffic over multiple connections.
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