N10-005 Question #635: Real Exam Question with Answer & Explanation

The correct answer is D: DNS. DNS (Domain Name System) uses port 53 by default, over both UDP (for standard queries) and TCP (for zone transfers or responses exceeding 512 bytes). RDP uses port 3389, QoS is a traffic prioritization mechanism not tied to a specific port, and DHCP uses ports 67 and 68.

Question

Which of the following uses port 53 by default?

Options

ARDP
BQoS
CDHCP
DDNS

Explanation

DNS (Domain Name System) uses port 53 by default, over both UDP (for standard queries) and TCP (for zone transfers or responses exceeding 512 bytes). RDP uses port 3389, QoS is a traffic prioritization mechanism not tied to a specific port, and DHCP uses ports 67 and 68.

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