350-501 Security and Services Practice Question
A service provider implements CGNAT to conserve IPv4 addresses. Which feature is required to ensure that application-level protocols such as SIP or FTP function correctly?
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
✓
ALG support
Many application protocols embed IP addresses in payload. ALGs (Application Level Gateways) inspect and modify these payloads to ensure proper translation. Without ALGs, these protocols may break.
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 block allocation
Why it's wrong here
Port allocation is for managing port resources, not payload inspection.
- ✓
ALG support
Why this is correct
ALGs handle protocol-specific translations like SIP, FTP.
- ✗
Logging
Why it's wrong here
Logging is for compliance, not protocol functionality.
- ✗
Session limits
Why it's wrong here
Session limits are for resource management.
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JA
Written by Johnson Ajibi, MSc IT Security
Senior Network & Security Engineer · founder of Courseiva
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