The answer is that the authorization profile does not include a voice VLAN. This is the most likely cause because, while the session attributes show a successful 802.1X authentication and a QoS marking of device-traffic-class=voice, that marking only prioritizes traffic—it does not assign the endpoint to a separate voice VLAN. For VoIP calls to function, the authorization profile must explicitly return a voice VLAN ID, which places the phone’s traffic into a dedicated Layer 2 segment; without this, the phone remains on the data VLAN, where voice traffic is not properly isolated or prioritized, leading to call failures. On the Cisco SCOR 350-701 exam, this scenario tests your understanding that 802.1X authorization profiles control VLAN assignment separately from QoS attributes—a common trap is confusing the device-traffic-class attribute with an actual VLAN change. Remember the memory tip: “Marking is not mapping; a QoS tag won’t put you in a voice VLAN.”
350-701 Practice Question: Secure Network Access, Visibility and Enforcement
This 350-701 practice question tests your understanding of secure network access, visibility and enforcement. 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.
Refer to the exhibit. A network administrator reviews the ISE live log for a successful 802.1X authentication. After authentication, the user is unable to make VoIP calls. What is the most likely cause?
Clue words in this question
Noticing these words before you look at the options changes how you read each choice.
Clue: "most likely"
Why it matters: Probability qualifier — the question wants the most probable cause or outcome, not a guaranteed one. Eliminate low-probability options.
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
The authorization profile does not include a voice VLAN.
Option B is correct because the authorization profile 'Standard_Access' likely does not include a voice VLAN assignment, which is required for VoIP traffic. Though the session attributes show 'device-traffic-class=voice', this is a QoS marking, not a VLAN assignment. Option A is incorrect because multi-domain mode is for phones behind PCs, not directly related to VoIP capability. Option C is incorrect because the user's phone authenticates independently. Option D is incorrect because the attribute is correctly formatted.
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.
✗
The user's phone is not configured for 802.1X.
Why it's wrong here
The log shows the user's PC authenticated; the phone may not be the authenticated device.
✗
The RADIUS attribute 'device-traffic-class=voice' is incorrect.
Why it's wrong here
This attribute is used for QoS and is correctly formatted.
✗
The switch port is not configured with 'authentication host-mode multi-domain'.
Why it's wrong here
Multi-domain mode is needed if a phone and PC share the same port, but not the cause of unable to make calls.
✓
The authorization profile does not include a voice VLAN.
Why this is correct
VoIP requires a dedicated voice VLAN; without it, the phone cannot communicate with the call manager.
Clue confirmation
The clue word "most likely" in the question point toward this answer.
Related concept
Authentication checks who the user is.
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.
Trap categories for this question
Command / output trap
The log shows the user's PC authenticated; the phone may not be the authenticated device.
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 350-701 questions on access control and AAA configuration.
Secure Network Access, Visibility and Enforcement — This question tests Secure Network Access, Visibility and Enforcement — Authentication checks who the user is..
What is the correct answer to this question?
The correct answer is: The authorization profile does not include a voice VLAN. — Option B is correct because the authorization profile 'Standard_Access' likely does not include a voice VLAN assignment, which is required for VoIP traffic. Though the session attributes show 'device-traffic-class=voice', this is a QoS marking, not a VLAN assignment. Option A is incorrect because multi-domain mode is for phones behind PCs, not directly related to VoIP capability. Option C is incorrect because the user's phone authenticates independently. Option D is incorrect because the attribute is correctly formatted.
What should I do if I get this 350-701 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 350-701 questions on access control and AAA configuration.
Are there clue words in this question I should notice?
Yes — watch for: "most likely". Probability qualifier — the question wants the most probable cause or outcome, not a guaranteed one. Eliminate low-probability options.
What is the key concept behind this question?
Authentication checks who the user is.
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