FORTINET-NSE123 Practice Question: Nse 2 Technical Introduction TO Fortinet Security
An organization is deploying FortiGate in Transparent mode instead of NAT mode. How does a Transparent mode FortiGate handle incoming packets at Layer 2?
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
✓
It operates as a Layer 2 bridge, inspecting traffic without altering IP addresses or performing routing
In Transparent mode, the FortiGate operates as a bridge (Layer 2 device) without modifying IP addresses, inspecting traffic as it passes between interfaces on the same subnet.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✗
It performs full NAT on all source and destination IP addresses for every packet
Why it's wrong here
NAT is disabled by definition in Transparent mode.
- ✗
It terminates all Ethernet frames and encapsulates them into PPPoE tunnels
Why it's wrong here
Transparent mode passes normal Ethernet frames across the bridge.
- ✗
It acts as a dynamic routing peer running BGP and OSPF across all interfaces
Why it's wrong here
Routing protocols are not used in L2 transparent bridge mode.
- ✓
It operates as a Layer 2 bridge, inspecting traffic without altering IP addresses or performing routing
Why this is correct
Transparent mode bridges traffic at Layer 2 without routing or altering IP headers.
Visual reference
About these practice questions
This FORTINET-NSE123 question is part of Courseiva's 296-question bank — original exam-style content with full explanations and wrong-answer analysis, never real exam questions or exam dumps. Learn why practice questions differ from exam dumps →
JA
Written and reviewed by Johnson Ajibi, MSc IT Security
Senior Network & Security Engineer · founder of Courseiva
Last reviewed August 2026 · checked against the official Fortinet exam blueprint
This FORTINET-NSE123 practice question is part of Courseiva's free Fortinet 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 FORTINET-NSE123 exam.