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Questions and Answers
True or false: UDP is used for reliable data transfers.
True or false: UDP is used for reliable data transfers.
False (B)
True or false: TCP is used for unordered data transfers.
True or false: TCP is used for unordered data transfers.
False (B)
True or false: The application layer is an abstraction layer that sits on top of the transport layer.
True or false: The application layer is an abstraction layer that sits on top of the transport layer.
True (A)
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Study Notes
- The application layer is an abstraction layer that sits on top of the transport layer.
- Application layer protocols use the underlying transport layer protocols to establish host-to-host connections.
- For example, World-Wide-Web servers operate on port 80, and email relay servers usually listen on port 25.
- TCP is used for reliable, ordered data transfers, while UDP is used for less reliable, unordered data transfers.
- UDP lacks built-in network congestion avoidance, and so must be carefully designed to prevent network collapse.
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