ISC2 CC Network Security Practice Question
Which transport layer protocol is used by voice over IP (VoIP) applications that require low latency and can tolerate some packet loss?
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
UDP is connectionless and faster, making it suitable for real-time applications like VoIP where occasional packet loss is acceptable.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✗
ICMP
Why it's wrong here
ICMP is used for network diagnostics, not data transport.
- ✗
SCTP
Why it's wrong here
SCTP is used for signaling, but not commonly for VoIP media.
- ✗
TCP
Why it's wrong here
TCP is reliable but introduces latency due to retransmissions.
- ✓
UDP
Why this is correct
UDP is low-latency and suitable for real-time traffic.
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Written by Johnson Ajibi, MSc IT Security
Senior Network & Security Engineer · founder of Courseiva
This CC 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 CC exam.