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Which OSI layer is concerned with reliable end-to-end delivery of data?
A. Application
B. Transport
C. Network
D. Data Link
Solution
B is correct. The Transport layer is responsible for segmentation, flow control, and reliable end-
to-end data delivery.
A, C, and D are incorrect. A is incorrect because the Application layer allows programs to access
a network. C is incorrect because the Network layer is responsible for logical addressing and
routing. D is incorrect because the Data Link layer is responsible for encapsulation, framing,
media access, and physical addressing.

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