Question 1easymultiple choice
Read the full DNS explanation →Question 928 of 1,000
Quick Answer
The correct answer is the firewall policy configuration with Source: 10.0.0.0/8, Destination: 8.8.8.8, Service: HTTPS, and Action: Accept. This works because it explicitly defines the allowed traffic parameters—matching the internal network as the source, the public DNS server as the sole destination, and HTTPS (TCP/443) as the permitted service—while the implicit deny rule at the end of the policy list automatically blocks all other traffic, including any HTTP or DNS queries to 8.8.8.8. On the Fortinet NSE 4 Network Security Professional exam, this scenario tests your understanding of policy matching order and the importance of specifying both source and destination to restrict HTTPS traffic to a specific destination, a common trap being the temptation to leave the destination as "all" or to use a broader service like "HTTP." A useful memory tip is "Source, Destination, Service, Accept—if it doesn't match, it gets reject."
NSE4 Firewall Policies and NAT Practice Question
This NSE4 practice question tests your understanding of firewall policies and nat. This is a configuration task: choose the command set that satisfies every stated requirement. Small differences — like 'secret' vs 'password' or 'transport input ssh' vs 'all' — change whether the answer is correct. 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.
A network administrator needs to allow only HTTPS traffic from the internal network (10.0.0.0/8) to the public DNS server (8.8.8.8). Which firewall policy configuration BEST enforces this restriction?
Clue words in this question
Noticing these words before you look at the options changes how you read each choice.
Clue:
"best"Why it matters: Signals that multiple options may be partially correct. Choose the option that most directly solves the exact problem described, not the one that sounds most complete.
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
✓
Source: 10.0.0.0/8, Destination: 8.8.8.8, Service: HTTPS, Action: Accept
Option C is correct because it specifies the internal network (10.0.0.0/8) as the source, the public DNS server (8.8.8.8) as the destination, and HTTPS (TCP/443) as the service, with an Accept action. This precisely matches the requirement to allow only HTTPS traffic from the internal network to that specific destination, blocking all other traffic by default via the implicit deny rule.
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 may confuse 'service' with 'destination port' and overlook that specifying 'ALL' for service or destination will permit unintended traffic, failing the precise restriction required.
Detailed technical explanation
How to think about this question
In FortiGate firewall policies, the implicit deny rule at the end of the policy list drops any traffic not explicitly matched by an Accept policy. The service object for HTTPS typically matches TCP port 443, but it can also include other attributes like protocol number (6 for TCP) and optional application control signatures. In a real-world scenario, if the DNS server also listens on port 53 (UDP), this policy would block standard DNS queries, which is intentional per the requirement to allow only HTTPS.
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 small business has 20 workstations on the 192.168.1.0/24 network and one public IP from its ISP. The router uses PAT (NAT overload) so all 20 devices share one public address using different source ports. NAT questions test whether you understand the four address terms and which direction each translation applies.
What to study next
Got this wrong? Here's your next step.
Identify which exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.
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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: Source: 10.0.0.0/8, Destination: 8.8.8.8, Service: HTTPS, Action: Accept — Option C is correct because it specifies the internal network (10.0.0.0/8) as the source, the public DNS server (8.8.8.8) as the destination, and HTTPS (TCP/443) as the service, with an Accept action. This precisely matches the requirement to allow only HTTPS traffic from the internal network to that specific destination, blocking all other traffic by default via the implicit deny rule.
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.
Are there clue words in this question I should notice?
Yes — watch for: "best". Signals that multiple options may be partially correct. Choose the option that most directly solves the exact problem described, not the one that sounds most complete.
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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