The answer is to use separate firewall rules for inbound and outbound traffic. This is correct because DMZ security best practices hinge on the principle of least privilege and strict traffic segmentation; inbound rules should only permit necessary public services like HTTP/HTTPS from the internet into the DMZ, while outbound rules must tightly control what DMZ hosts can initiate back to the internal network, typically allowing only established sessions or specific, approved protocols. On the Systems Security Certified Practitioner SSCP exam, this concept tests your understanding of network segmentation and defense-in-depth, often appearing in scenario-based questions where a compromised DMZ server is used as a pivot to attack the internal LAN—a common trap is assuming a single, permissive rule set is sufficient. Remember the memory tip: “Inbound is a filter, outbound is a lock.”
SSCP Network and Communications Security Practice Question
This SSCP practice question tests your understanding of network and communications security. Read the scenario carefully and evaluate each option against the stated constraints before committing to an answer. 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 company implements a DMZ to host public services. Which of the following is the best practice for securing the DMZ?
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 the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
Use separate firewall rules for inbound and outbound traffic
Option C is correct because DMZ security relies on strict separation of inbound and outbound traffic rules. Inbound rules should permit only necessary traffic (e.g., HTTP/HTTPS to web servers) from the internet to the DMZ, while outbound rules should restrict DMZ-initiated connections to the internal network, typically allowing only established sessions or specific protocols. This prevents an attacker who compromises a DMZ host from using it as a pivot to access internal resources.
Key principle: Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
✗
Allow all traffic from the internet to the DMZ
Why it's wrong here
This would expose DMZ to unrestricted access.
✗
Disable logging on DMZ firewalls
Why it's wrong here
Logging is critical for incident detection.
✓
Use separate firewall rules for inbound and outbound traffic
Why this is correct
Allows strict control over traffic flows.
Clue confirmation
The clue word "best" in the question point toward this answer.
Related concept
Read the scenario before looking for a memorised answer.
✗
Place the DMZ behind the internal firewall
Why it's wrong here
DMZ should be separated from internal network by firewalls.
✗
Use the same subnet for DMZ and internal network
Why it's wrong here
This bypasses segmentation.
Common exam traps
Common exam trap: answer the scenario, not the keyword
The trap here is that candidates often confuse the DMZ's placement (thinking it should be behind the internal firewall for extra protection) with the need for separate rule sets, but the correct placement is between two firewalls (or a single firewall with three interfaces) with distinct inbound and outbound rules to enforce isolation.
Detailed technical explanation
How to think about this question
In practice, DMZ firewalls often implement stateful inspection with separate rule sets for inbound and outbound traffic, where outbound rules may restrict DMZ hosts to only initiate connections to specific internal services (e.g., database servers) on defined ports. A common real-world scenario involves a web server in the DMZ that needs to query an internal SQL database; the outbound rule should permit only that specific traffic, not general outbound access. This aligns with the principle of least privilege and is often enforced using access control lists (ACLs) that explicitly deny all traffic not matching allowed flows.
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 security analyst at a medium-sized enterprise encounters this scenario during an investigation or architecture review. The correct answer reflects best practice for the specific threat or control described. Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option. Security exam questions test whether you can match controls to threats in context — not just recall definitions.
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.
Network and Communications Security — This question tests Network and Communications Security — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: Use separate firewall rules for inbound and outbound traffic — Option C is correct because DMZ security relies on strict separation of inbound and outbound traffic rules. Inbound rules should permit only necessary traffic (e.g., HTTP/HTTPS to web servers) from the internet to the DMZ, while outbound rules should restrict DMZ-initiated connections to the internal network, typically allowing only established sessions or specific protocols. This prevents an attacker who compromises a DMZ host from using it as a pivot to access internal resources.
What should I do if I get this SSCP 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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Question Discussion
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