DNS query uses which protocol

The correct answer is B. UDP. DNS (Domain Name System) queries primarily use UDP on port 53. UDP is chosen because it is connectionless and fast, which is ideal for the small, simple request-response nature of most DNS lookups. If a DNS response is too large to fit in a single UDP packet (over 512 bytes…

Cybersecurity Fundamentals

Question

Options

ATCP
BUDP
CHTTP
DICMP

How the community answered

(31 responses)

B
90% (28)
C
6% (2)
D
3% (1)

Explanation

DNS (Domain Name System) queries primarily use UDP on port 53. UDP is chosen because it is connectionless and fast, which is ideal for the small, simple request-response nature of most DNS lookups. If a DNS response is too large to fit in a single UDP packet (over 512 bytes traditionally, or when DNSSEC is involved), DNS will fall back to TCP on port 53 for that specific transaction. However, the default and standard protocol for DNS queries is UDP. HTTP (C) is an application-layer protocol for web traffic, and ICMP (D) is used for diagnostic tools like ping and traceroute - neither is used for DNS queries.

Topics

#DNS#UDP#network protocols

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