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300-410 Practice Question: According to RFC 2663, what is the term for the…
According to RFC 2663, what is the term for the process of translating both the source and destination IP addresses in a packet?
⚠ Common exam trap
Many candidates confuse 'Twice NAT' with 'Double NAT' — Cisco often tests this distinction, where Double NAT implies two separate NAT devices in series, while Twice NAT is a single device performing bidirectional translation as defined in RFC 2663.
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
✓
Twice NAT
RFC 2663 defines 'Twice NAT' as the process of translating both the source and destination IP addresses within a single packet. This is necessary when the private and public address spaces overlap, requiring simultaneous translation of both the source and destination fields to ensure proper routing and reachability.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✗
Static NAT
Why it's wrong here
Static NAT is a one-to-one mapping, not necessarily both directions.
- ✓
Twice NAT
Why this is correct
Twice NAT translates both source and destination addresses.
- ✗
PAT
Why it's wrong here
PAT is port address translation, a form of source NAT.
- ✗
Double NAT
Why it's wrong here
While sometimes used interchangeably, the RFC term is 'Twice NAT'.
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Written by Johnson Ajibi, MSc IT Security
Senior Network & Security Engineer · founder of Courseiva
This 300-410 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 300-410 exam.