NSE4 Firewall Policies and NAT Practice Question
Which of the following best describes a Virtual IP (VIP) in FortiGate?
⚠ Common exam trap
Candidates often confuse Virtual IP (Destination NAT) with IP Pool (Source NAT), as both involve address translation but serve opposite traffic directions; candidates often pick Option B thinking VIP is for outbound translation.
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
✓
A method to translate a public IP/port to a private IP/port for inbound traffic
A Virtual IP (VIP) in FortiGate is used for Destination NAT (DNAT), translating an incoming public IP address and port to a private IP address and port. This allows external hosts to access internal servers (e.g., web servers) using a public IP, while the server remains on a private RFC 1918 address. The VIP object is referenced in a firewall policy to permit the inbound traffic and perform the translation.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✓
A method to translate a public IP/port to a private IP/port for inbound traffic
Why this is correct
VIP maps external (public) addresses to internal (private) destinations, enabling inbound access.
- ✗
A method to translate private source IPs to a public IP for outbound traffic
Why it's wrong here
That describes source NAT (SNAT) or IP pool.
- ✗
A method to group multiple firewall policies
Why it's wrong here
VIP is not related to policy grouping.
- ✗
A method to load balance traffic across multiple WAN interfaces
Why it's wrong here
Load balancing uses SD-WAN or policy-based routing, not VIP.
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Written by Johnson Ajibi, MSc IT Security
Senior Network & Security Engineer · founder of Courseiva
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