Question 932 of 988

Endpoint Security and Identity →mediumMultiple ChoiceObjective-mapped

350-701 Endpoint Security and Identity Practice Question

This 350-701 practice question tests your understanding of endpoint security and identity. 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 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?

A
Single-host authentication
Why wrong: Single-host allows only one device per port.
B
Multi-domain authentication (MDA)
MDA enables separate authentication for voice and data domains on the same port.
C
MAC Authentication Bypass (MAB)
Why wrong: MAB is for non-802.1X devices but does not handle multiple supplicants on one port.
D
Guest VLAN
Why wrong: Guest VLAN provides limited access for unauthenticated devices, not for authenticating multiple devices.

Full breakdown with real-world context →

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.

Key principle: A trunk being up does not mean the VLAN is allowed across it. Always verify the allowed VLAN list and whether the VLAN exists on both switches.

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.
Related concept
Access ports place end devices into a single VLAN.
✗
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.

Common exam traps

Common exam trap: an active trunk can still block the VLAN you need

A trunk being up does not prove every VLAN is crossing it. Check allowed VLAN lists, native VLAN mismatch, VLAN existence and access-port assignment.

Detailed technical explanation

How to think about this question

VLAN questions usually combine access-port and trunking clues. The key is to identify whether the issue is local to one switchport, caused by the trunk, or caused by the VLAN not existing where it needs to exist.

KKey Concepts to Remember

Access ports place end devices into a single VLAN.
Trunk ports carry multiple VLANs between switches.
Allowed VLAN lists decide which VLANs can cross a trunk.
Native VLAN mismatch can create confusing symptoms.

TExam Day Tips

Use show vlan brief to verify access VLANs.
Use show interfaces trunk to verify trunk state and allowed VLANs.
Do not treat every same-VLAN issue as a routing problem.

Key takeaway

A trunk being up does not mean the VLAN is allowed across it. Always verify the allowed VLAN list and whether the VLAN exists on both switches.

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.

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.

What to study next

Got this wrong? Here's your next step.

Review VLAN allowed lists, native VLAN mismatch detection, and how to verify VLAN membership with show vlan brief and show interfaces trunk. Then practise related 350-701 questions on switching, trunking, and access-port configuration.

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FAQ

Questions learners often ask

What does this 350-701 question test?

Endpoint Security and Identity — This question tests Endpoint Security and Identity — Access ports place end devices into a single VLAN..

What is the correct answer to this question?

The correct answer is: 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.

What should I do if I get this 350-701 question wrong?

What is the key concept behind this question?

Access ports place end devices into a single VLAN.

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Last reviewed: Jul 4, 2026

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