FORTINET-NSE123 Practice Question: Nse 2 Technical Introduction TO Fortinet Security
When configuring a FortiGate interface to connect to an external ISP network that utilizes dynamic IP assignment via DHCP, which setting must be enabled on the interface parameters?
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
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Set Addressing Mode to DHCP
When connecting an external interface to an ISP providing dynamic addressing, the addressing mode must be set to DHCP so the FortiGate requests and acquires its IP address automatically.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✓
Set Addressing Mode to DHCP
Why this is correct
Configuring the interface addressing mode to DHCP allows the FortiGate to obtain dynamic IP parameters from the ISP.
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Enable Secondary IP addressing
Why it's wrong here
Secondary IPs add extra static subnets to an interface, not dynamic client provisioning.
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Configure a Static Virtual IP (VIP) mapping
Why it's wrong here
VIPs are used for port forwarding and inbound NAT, not dynamic interface WAN configuration.
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Enable PPPoE client emulation mode
Why it's wrong here
PPPoE is used for DSL connections requiring username and authentication, not standard DHCP.
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.