CISSP Communication and Network Security Practice Question
This CISSP practice question tests your understanding of communication and network 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 is deploying a wireless network for guests. The security requirement is to provide internet access only, with no access to the internal corporate network. Which technology should be used?
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
A separate guest VLAN with ACLs restricting access to internal networks
A separate guest VLAN with ACLs restricting access to internal networks is the correct choice because it provides network segmentation at Layer 2 (VLAN) and Layer 3/4 (ACLs), ensuring guest traffic is isolated from the corporate network while allowing internet access. This approach aligns with the principle of least privilege and is a standard best practice for guest wireless deployments, as it does not rely on authentication or encryption alone to enforce access control.
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.
✗
WPA3-SAE
Why it's wrong here
WPA3-SAE provides robust encryption but does not enforce network segmentation.
✗
MAC address filtering
Why it's wrong here
MAC filtering controls access but does not prevent guests from reaching internal resources once connected.
✓
A separate guest VLAN with ACLs restricting access to internal networks
Why this is correct
A guest VLAN combined with ACLs that block access to internal subnets ensures guests can only reach the internet.
Related concept
Read the scenario before looking for a memorised answer.
✗
WPA2-Enterprise with 802.1X
Why it's wrong here
WPA2-Enterprise provides strong authentication but does not inherently isolate guests from internal networks.
Common exam traps
Common exam trap: answer the scenario, not the keyword
The trap here is that candidates often confuse strong authentication (WPA2-Enterprise or WPA3) with network segmentation, failing to realize that authentication alone does not enforce access boundaries between guest and corporate networks.
Detailed technical explanation
How to think about this question
In practice, the guest VLAN is typically configured on the wireless controller or access point, and ACLs are applied on the VLAN interface or upstream router to deny traffic to RFC 1918 private IP ranges (e.g., 10.0.0.0/8, 172.16.0.0/12, 192.168.0.0/16) while permitting outbound internet traffic via NAT. This setup ensures that even if a guest device is compromised, it cannot pivot to internal hosts because the ACLs block all traffic to corporate subnets at the network layer.
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 developer is choosing between AES-256 (symmetric) and RSA-2048 (asymmetric) for encrypting a large file that will be sent to a partner. Symmetric encryption is fast but requires key exchange; asymmetric is slower but solves the key distribution problem. A hybrid approach — encrypt the file with AES, encrypt the AES key with RSA — is standard. Questions like this test whether you understand when each approach applies.
Related glossary terms
Concepts from this question explained
These glossary pages explain the core terms tested in this CISSP question in full detail.
Communication and Network Security — This question tests Communication and Network Security — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: A separate guest VLAN with ACLs restricting access to internal networks — A separate guest VLAN with ACLs restricting access to internal networks is the correct choice because it provides network segmentation at Layer 2 (VLAN) and Layer 3/4 (ACLs), ensuring guest traffic is isolated from the corporate network while allowing internet access. This approach aligns with the principle of least privilege and is a standard best practice for guest wireless deployments, as it does not rely on authentication or encryption alone to enforce access control.
What should I do if I get this CISSP 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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Question Discussion
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