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At which layer in the Open Systems Interconnection (OSI) model does flow control generally operate?

A. the Network layer

B. the Transport layer

C. the Physical layer

D. the Session layer

Explanation:
Flow control generally operates at the Transport layer of the OSI model. The Transport layer is responsible for the error-free and sequential delivery of data. This
layer is used to manage data transmission between devices, a process known as flow control. The Transport layer protocols are Transmission Control Protocol
(TCP) and User Datagram Protocol (UDP).
Flow control does not operate at the Network layer in the OSI model. The Network layer defines the network address or the Internet Protocol (IP) address, which is
then used by the routers to forward the packets.

Flow control does not operate at the Physical layer in the OSI model. The Physical layer describes the physical medium (i.e. Ethernet, fiber optic, or wireless) used
for sending and receiving data on a carrier.
Flow control does not operate at the Session layer in the OSI model. The Session layer provides the mechanism for opening, closing and managing a session
between end-user application processes.
Objective:
Network Fundamentals
Sub-Objective:
Compare and contrast OSI and TCP/IP models
References:
http://docwiki.cisco.com/wiki/Internet_Protocols#Figure:_Twelve_fields_comprise_a_TCP_packet

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