SSCP Network and Communications Security Practice Question
Which UDP port is used by the Domain Name System (DNS) for name resolution queries?
Answer choices
Why each option matters
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
UDP 53
DNS uses UDP port 53 for queries by default.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✗
UDP 161
Why it's wrong here
UDP 161 is used by SNMP.
- ✗
UDP 67
Why it's wrong here
UDP 67 is used by DHCP server.
- ✓
UDP 53
Why this is correct
DNS uses UDP 53.
- ✗
UDP 123
Why it's wrong here
UDP 123 is used by NTP.
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JA
Written by Johnson Ajibi, MSc IT Security
Senior Network & Security Engineer · founder of Courseiva
This SSCP practice question is part of Courseiva's free ISC2 certification practice question bank. Courseiva provides original exam-style practice questions with explanations, topic-based practice, mock exams, readiness tracking, and study analytics to help learners prepare for the SSCP exam.