200-301 Question #863: Real Exam Question with Answer & Explanation

Question

Under which condition is TCP preferred over UDP?

Options

• AUDP is used when low latency is optimal, and TCP is used when latency is tolerable.
• BTCP is used when dropped data is more acceptable, and UDP is used when data is accepted out-
• CTCP is used when data reliability is critical, and UDP is used when missing packets are
• DUDP is used when data is highly interactive, and TCP is used when data is time-sensitive.

Explanation

TCP is preferred over UDP when the application demands guaranteed data delivery and reliability, even at the cost of potential latency.

Common mistakes.

• A. This statement is generally correct about the use cases but doesn't explain why TCP is preferred; it just states when.
• B. This statement is incorrect; TCP is used when dropped data is not acceptable (it retransmits), and UDP is often used when out-of-order data might be handled by the application or is less critical, but TCP ensures in-order delivery.
• D. This statement incorrectly assigns characteristics; UDP is often used for highly interactive or time-sensitive data where some loss is acceptable for low latency (e.g., VoIP), while TCP, due to its overhead, might introduce more latency and is used when reliability is key, regardless of some latency.

Concept tested. TCP vs. UDP characteristics

Reference. https://learn.microsoft.com/en-us/windows-server/networking/technologies/network-subsystem/tcp-udp-feature-overview

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