mediumMultiple Choice
350-401 Practice Question: Runs the following command on Switch SW1: SW1#…
A network engineer runs the following command on Switch SW1:
SW1# show vlan brief VLAN Name Status Ports
---- -------------------------------- --------- ------------------------------- 1 default active Gi0/1, Gi0/2, Gi0/3 10 Sales active Gi0/4, Gi0/5 20 Engineering active Gi0/6, Gi0/7 1002 fddi-default act/unsup 1003 token-ring-default act/unsup 1004 fddinet-default act/unsup 1005 trnet-default act/unsup
Based on this output, what can be concluded?
⚠ Common exam trap
Cisco often tests the distinction between access and trunk port representation in 'show vlan brief' versus 'show interfaces trunk', leading candidates to incorrectly assume all listed ports are trunk ports or that VLANs 1002-1005 are fully functional.
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
✓
Interfaces Gi0/1, Gi0/2, and Gi0/3 are in VLAN 1.
The 'show vlan brief' output explicitly lists Gi0/1, Gi0/2, and Gi0/3 under VLAN 1 (default), confirming these interfaces are access ports assigned to VLAN 1. VLAN 1 is the default VLAN on Cisco switches, and all ports not explicitly configured otherwise belong to it.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✗
All ports shown are in trunk mode.
Why it's wrong here
Trunk ports would appear in 'show interfaces trunk' or be listed with 'trunk' in 'show vlan brief' (some IOS versions show trunk ports as 'trunk' in the Ports column). Here, only access ports are listed.
- ✗
VLANs 1002-1005 are active and supported.
Why it's wrong here
The VLANs 1002–1005 are shown in the 'act/unsup' state, meaning they are active but unsupported on this hardware platform. These are reserved FDDI and Token Ring VLANs, and the 'unsup' status indicates the switch cannot actually process them for user data forwarding. Therefore, the claim that they are both active and supported is false; their being active in the VLAN database does not imply they are operationally supported.
- ✓
Interfaces Gi0/1, Gi0/2, and Gi0/3 are in VLAN 1.
Why this is correct
In the 'show vlan brief' output, the Ports column for VLAN 1 lists Gi0/1, Gi0/2, and Gi0/3, which is exactly what identifies those interfaces as access ports in VLAN 1. Access ports are statically assigned to a VLAN and their membership appears in this list. Because trunk links are not displayed the same way as individual access members in this output, the listed interfaces are definitively VLAN 1 access ports.
- ✗
VLAN 20 has no ports assigned.
Why it's wrong here
VLAN 20 is not without ports because the Ports column for VLAN 20 explicitly shows Gi0/6 and Gi0/7 assigned. The statement that VLAN 20 has no ports assigned misreads the output, which lists those two interfaces as active access members in that VLAN. Since interfaces Gi0/6 and Gi0/7 appear under VLAN 20, this option is incorrect.
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JA
Written by Johnson Ajibi, MSc IT Security
Senior Network & Security Engineer · founder of Courseiva
This 350-401 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 350-401 exam.