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Quick Answer
The answer is to create a service group containing both service objects. This is the most efficient method because a service group allows you to logically bundle the two separate UDP service objects—one for port 5060 and another for the range 10000-20000—into a single, reusable group that can be applied in one firewall policy, avoiding duplicate rules or overly broad port definitions. On the Fortinet NSE 4 Network Security Professional exam, this scenario tests your understanding of how to manage VoIP traffic efficiently using FortiGate service groups, a key concept in policy creation that often appears as a trap where candidates mistakenly try to use a single custom service with a discontinuous range or create multiple policies. Remember the memory tip: “Group your SIP and RTP, keep your policy neat and tidy.”
NSE4 Firewall Policies and NAT Practice Question
This NSE4 practice question tests your understanding of firewall policies and nat. Match the stated requirement to the specific cloud service, access model, or configuration option — many options are valid in isolation but not for this scenario. After answering, compare your reasoning against the explanation and wrong-answer breakdown below. Once you have made your selection, read the full explanation to reinforce the concept and understand why each distractor is designed to mislead on exam day.
An administrator needs to allow VoIP traffic from a remote branch (192.168.2.0/24) to the main office (10.0.0.0/8) using UDP ports 5060 and 10000-20000. What is the most efficient way to define the service in the firewall policy?
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
✓
Create a service group containing both service objects
Option A is correct because creating a service group allows you to combine two separate service objects (one for UDP 5060 and one for UDP 10000-20000) into a single logical group, which can then be applied in one firewall policy. This is the most efficient method as it avoids duplicating policies or using an overly broad port range, and it leverages FortiGate's service group feature for clean, manageable rule sets.
Key principle: Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
Common exam traps
Common exam trap: answer the scenario, not the keyword
The trap here is that candidates often assume a single port range (5060-20000) is acceptable for efficiency, overlooking the security risk of opening unnecessary ports, or they mistakenly rely on the predefined 'VoIP' service object without verifying its exact port definitions.
Detailed technical explanation
How to think about this question
In FortiGate, service groups are logical containers that can hold multiple service objects, and when referenced in a firewall policy, the policy matches traffic matching any of the services in the group (OR logic). This is particularly useful for VoIP, where signaling (SIP on UDP 5060) and media (RTP on UDP 10000-20000) use distinct port ranges; grouping them ensures both are allowed without creating separate policies. Under the hood, FortiGate compiles the service group into a single rule entry in the firewall's fast-path processing, maintaining performance while simplifying management.
KKey Concepts to Remember
- Read the scenario before looking for a memorised answer.
- Find the constraint that changes the correct option.
- Eliminate answers that are true in general but not in this case.
TExam Day Tips
- Watch for words such as best, first, most likely and least administrative effort.
- Review why wrong options are wrong, not only why the correct option is correct.
Key takeaway
Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
Real-world example
How this comes up in practice
A practitioner preparing for the NSE4 exam encounters this exact type of scenario on the job. The correct answer here is not the most general option — it is the best answer for the specific constraint described. Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option. Real exam questions reward reading the full scenario before eliminating options, because the constraint defines which answer fits.
What to study next
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FAQ
Questions learners often ask
What does this NSE4 question test?
Firewall Policies and NAT — This question tests Firewall Policies and NAT — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: Create a service group containing both service objects — Option A is correct because creating a service group allows you to combine two separate service objects (one for UDP 5060 and one for UDP 10000-20000) into a single logical group, which can then be applied in one firewall policy. This is the most efficient method as it avoids duplicating policies or using an overly broad port range, and it leverages FortiGate's service group feature for clean, manageable rule sets.
What should I do if I get this NSE4 question wrong?
Identify which exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.
What is the key concept behind this question?
Read the scenario before looking for a memorised answer.
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Last reviewed: Jun 24, 2026
This NSE4 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 NSE4 exam.
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