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What layer in the TCP/IP stack is equivalent to the Transport layer of the OSI model?
Correct Answer: B
In the TCP/IP model (also known as the DoD model), the Host-to-Host layer is responsible for reliable end-to- end communication, which aligns directly with the Transport Layer (Layer 4) of the OSI model. This layer is where TCP and UDP protocols reside. MTCNA Course Material - Protocol Layers Mapping: "The Host-to-Host layer in TCP/IP model corresponds to the Transport layer in OSI. It handles reliable delivery through TCP and connectionless communication via UDP." Rene Meneses MTCNA Study Guide - TCP/IP vs OSI: "Host-to-Host layer = OSI Layer 4. Protocols: TCP, UDP." Other layers: * Application # OSI Layers 5-7 * Internet # OSI Layer 3 * Network Access # OSI Layers 1-2