- A
Enable client isolation (peer-to-peer blocking) on the guest SSID.
Correct because client isolation prevents guest clients from communicating with each other and with internal network resources, ensuring security.
- B
Configure 802.1X authentication for the guest SSID as well.
Why wrong: Incorrect because guest SSID typically uses open authentication with a captive portal; 802.1X would require credentials and is not suitable for guests.
- C
Apply a VLAN ACL on the guest VLAN to block access to internal subnets.
Why wrong: Incorrect while a VLAN ACL could help, it does not prevent guest-to-guest communication; client isolation is more direct and effective.
- D
Place the guest SSID on the same VLAN as the employee SSID.
Why wrong: Incorrect because placing guest and employee traffic on the same VLAN would defeat security; they should be on separate VLANs.
Quick Answer
The answer is to enable client isolation, also known as peer-to-peer blocking, on the guest SSID. This configuration prevents wireless guest clients from communicating with each other or with any internal network resources, effectively creating a strict security boundary at the wireless layer. Even though the guest SSID uses a captive portal and is placed on a separate VLAN, without client isolation, authenticated guest users can still reach internal subnets through the WLC’s default forwarding behavior. On the ENCOR 350-401 exam, this scenario tests your understanding of how wireless segmentation differs from wired VLANs—a common trap is assuming a separate VLAN alone is sufficient for guest security. The key distinction is that client isolation operates at Layer 2 on the wireless controller, blocking all peer-to-peer traffic regardless of VLAN assignment. Remember the mnemonic: “Guest means no gossip”—if guests can talk to each other or to internal hosts, isolation is missing.
CCNP Wireless Infrastructure Practice Question
This 350-401 practice question tests your understanding of wireless infrastructure. 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.
An engineer is deploying a wireless network in a hospital that requires strict security and client isolation. The network must support 802.1X authentication for employees and a separate guest SSID with a captive portal. The engineer configures the WLC with RADIUS servers for 802.1X and a local web server for the captive portal. However, guest users can access the internal network after authentication. What configuration change is needed?
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
Enable client isolation (peer-to-peer blocking) on the guest SSID.
The correct answer is to enable client isolation (or peer-to-peer blocking) on the guest SSID. This prevents guest clients from communicating with each other and with internal resources. The other options are incorrect: 802.1X is not needed for guests, VLAN ACLs would be more complex, and guest traffic should be on a separate VLAN, but isolation must also be enforced at the wireless level.
Key principle: Authentication proves identity; authorization controls what that identity can do after login. Both must work for full privileged access.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✓
Enable client isolation (peer-to-peer blocking) on the guest SSID.
Why this is correct
Correct because client isolation prevents guest clients from communicating with each other and with internal network resources, ensuring security.
Related concept
Authentication checks who the user is.
- ✗
Configure 802.1X authentication for the guest SSID as well.
Why it's wrong here
Incorrect because guest SSID typically uses open authentication with a captive portal; 802.1X would require credentials and is not suitable for guests.
- ✗
Apply a VLAN ACL on the guest VLAN to block access to internal subnets.
- ✗
Place the guest SSID on the same VLAN as the employee SSID.
Why it's wrong here
Incorrect because placing guest and employee traffic on the same VLAN would defeat security; they should be on separate VLANs.
Common exam traps
Common exam trap: authentication is not authorization
Logging in proves the user can authenticate. It does not automatically mean the user is allowed to enter privileged or configuration mode. Watch for AAA authorization, privilege level and command authorization details.
Detailed technical explanation
How to think about this question
This kind of question is testing the difference between identity and permission. A user may successfully log in to a router because authentication is working, but still fail to enter configuration mode because authorization is missing, misconfigured or mapped to a lower privilege level.
KKey Concepts to Remember
- Authentication checks who the user is.
- Authorization controls what the user is allowed to do after login.
- Privilege levels affect access to EXEC and configuration commands.
- AAA, TACACS+ and RADIUS can separate login success from command access.
TExam Day Tips
- Do not assume successful login means full administrative access.
- Look for words such as cannot enter configuration mode, privilege level, authorization or command access.
- Separate login problems from permission problems before choosing the answer.
Key takeaway
Authentication proves identity; authorization controls what that identity can do after login. Both must work for full privileged access.
Real-world example
How this comes up in practice
A help-desk technician troubleshoots why a newly connected PC cannot reach shared printers on the same floor. The cable is good, the switch port is active, but the PC is in VLAN 20 and the printers are in VLAN 10. The uplink trunk only allows VLAN 10. A trunk being up does not mean every VLAN crosses it.
What to study next
Got this wrong? Here's your next step.
Review Cisco AAA concepts — authentication, authorization, and accounting. Study privilege levels (0–15), command authorization under TACACS+, and how RADIUS differs. Then practise related 350-401 questions on access control and AAA configuration.
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FAQ
Questions learners often ask
What does this 350-401 question test?
Wireless Infrastructure — This question tests Wireless Infrastructure — Authentication checks who the user is..
What is the correct answer to this question?
The correct answer is: Enable client isolation (peer-to-peer blocking) on the guest SSID. — The correct answer is to enable client isolation (or peer-to-peer blocking) on the guest SSID. This prevents guest clients from communicating with each other and with internal resources. The other options are incorrect: 802.1X is not needed for guests, VLAN ACLs would be more complex, and guest traffic should be on a separate VLAN, but isolation must also be enforced at the wireless level.
What should I do if I get this 350-401 question wrong?
Review Cisco AAA concepts — authentication, authorization, and accounting. Study privilege levels (0–15), command authorization under TACACS+, and how RADIUS differs. Then practise related 350-401 questions on access control and AAA configuration.
What is the key concept behind this question?
Authentication checks who the user is.
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Last reviewed: Jun 18, 2026
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