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Congestion control is BEST handled by which OSI layer?
A. Data link
B. Session layer
C. Transport layer
D. Network layer
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Answer: C
The transport layer is responsible for reliable data
delivery. This layer implements a flow control mechanism
that can detect congestion, reduce data transmission rates
and increase transmission rates when the network appears to
no longer be congested (e.g., TCP flow controls). The
network layer is not correct because congestion control
occurs based on router implementations of flow control at
the subnet level (i.e., source quench messages sent out when
router memory or the buffer reaches capacity), however, no
message exists to cancel or discard messages, which actually
may increase congestion problems. Session layer and data
link do not have any functionality for network management.
| Is This Answer Correct ? | 34 Yes | 22 No |
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