350-501 Security and Services Practice Question
An SP implements Carrier-Grade NAT (CGNAT) to conserve IPv4 addresses. For legal compliance, what additional function must be enabled to log subscriber IP-port mappings?
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
✓
NAT logging (syslog or other)
CGNAT logging is required for lawful intercept and auditing. ALG support is for application layer protocols, not logging. Port allocation is part of NAT operation. DPI classifies traffic.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✗
Port allocation algorithm (deterministic or random)
Why it's wrong here
This defines how ports are assigned, not logging.
- ✗
Application Layer Gateway (ALG) support
Why it's wrong here
ALG helps with specific protocols but does not log mappings.
- ✗
Deep Packet Inspection (DPI)
Why it's wrong here
DPI classifies traffic, not logging.
- ✓
NAT logging (syslog or other)
Why this is correct
Logging records subscriber IP, public IP, port, and timestamps.
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JA
Written by Johnson Ajibi, MSc IT Security
Senior Network & Security Engineer · founder of Courseiva
This 350-501 practice question is part of Courseiva's free Cisco 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 350-501 exam.