200-301 Question #869: Real Exam Question with Answer & Explanation

Question

Why is UDP more suitable than TCP for applications that require low latency such as VoIP?

Options

• AUDP reliably guarantees delivery of all packets: TCP drops packets under heavy load
• BUDP uses sequencing data for packets to arrive in order TCP offers the capability to receive
• CTCP uses congestion control for efficient packet delivery: UDP uses flow control mechanisms for
• DTCP sends an acknowledgement for every packet received: UDP operates without

Explanation

UDP is more suitable for low-latency applications like VoIP because it operates without the overhead of acknowledgments and retransmissions, unlike TCP, which prioritizes guaranteed delivery.

Common mistakes.

• A. This statement is incorrect; UDP does not reliably guarantee delivery of all packets, and while TCP can drop packets, its primary goal is reliable delivery through retransmission.
• B. This statement is incorrect; TCP uses sequencing to ensure in-order delivery, whereas UDP does not inherently provide sequencing.
• C. This statement is incorrect; TCP uses both congestion control and flow control, while UDP generally lacks these sophisticated mechanisms, contributing to its lower overhead and suitability for real-time traffic.

Concept tested. UDP advantages for low-latency applications

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

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