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350-701 Practice Question: Is configuring 802.1X on a switch port that…
A network engineer is configuring 802.1X on a switch port that connects to a VoIP phone and a PC behind the phone. Which authentication method should be used to authenticate both devices separately?
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
✓
Multi-domain authentication (MDA)
Multi-domain authentication (MDA) allows a switch port to authenticate multiple devices (e.g., phone and PC) separately, each with its own VLAN.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✗
Single-host authentication
Why it's wrong here
Single-host allows only one device per port.
- ✓
Multi-domain authentication (MDA)
Why this is correct
MDA enables separate authentication for voice and data domains on the same port.
- ✗
MAC Authentication Bypass (MAB)
Why it's wrong here
MAB is for non-802.1X devices but does not handle multiple supplicants on one port.
- ✗
Guest VLAN
Why it's wrong here
Guest VLAN provides limited access for unauthenticated devices, not for authenticating multiple devices.
Visual reference
Quick reference
AAA Protocol Comparison
| Protocol | Port(s) | Encryption | Transport | Primary Use |
|---|---|---|---|---|
| RADIUS | 1812 / 1813 | Password only | UDP | Network access control |
| TACACS+ | 49 | Full packet | TCP | Device administration |
| Diameter | 3868 | Full session | TCP / SCTP | Carrier / mobile networks |
| 802.1X | — | EAP-based | Layer 2 | Port-based access control |
TACACS+ encrypts the entire packet; RADIUS only encrypts the password field — a key exam distinction.
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Written by Johnson Ajibi, MSc IT Security
Senior Network & Security Engineer · founder of Courseiva
This 350-701 practice question is part of Courseiva's free Cisco 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 350-701 exam.