Cisco CCNA mock exam questions sample test – Question 376

.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

Correct Answer: B

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
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.
Network Fundamentals
Compare and contrast OSI and TCP/IP models
Cisco Documentation > Internetworking Technology Handbook > Routing Basics > Internet Protocols > TCP