Quick Answer
The answer is that VLAN 10 is a primary private VLAN. This is correct because the show vlan id 10 output explicitly displays "Private VLAN Type: Primary" and lists "Associated Secondary VLAN IDs: 100, 200," which are the defining characteristics of a primary VLAN in a private VLAN configuration. On the ENCOR 350-401 exam, this tests your ability to interpret switch output and distinguish between private VLAN types: a primary VLAN acts as the trunk-like backbone for secondary VLANs, while community VLANs allow intra-group communication and isolated VLANs restrict all host-to-host traffic. A common trap is confusing the "Primary VLAN ID" field with the private VLAN type, but the key is to look for the dedicated "Private VLAN Type" line. Remember the memory tip: "Primary is the parent, community is the clique, isolated is the loner."
This 350-401 practice question tests your understanding of vlans and trunking. Examine the command output carefully: the correct answer depends on what the output actually shows, not on general recall alone. 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 runs the following command on Switch SW1:
SW1# show vlan id 10 VLAN ID: 10 VLAN Name: Sales VLAN Type: Ethernet VLAN State: active
MTU: 1500
Remote SPAN VLAN: No
Primary VLAN ID: 10
Private VLAN Type: Primary
Associated Secondary VLAN IDs: 100, 200
Based on this output, what can be concluded?
Clue words in this question
Noticing these words before you look at the options changes how you read each choice.
Clue: "primary"
Why it matters: Asks for the main purpose or function, not a secondary benefit. Eliminate answers that describe side-effects or partial functions.
VLAN 10 is a community VLAN.
Why wrong: It is a primary VLAN, not community.
VLAN 10 is an isolated VLAN.
Why wrong: It is a primary VLAN.
VLAN 10 is a primary private VLAN.
The output shows 'Private VLAN Type: Primary' and associated secondary VLANs.
VLAN 10 is a normal data VLAN with no private VLAN features.
Why wrong: The output clearly indicates private VLAN configuration.
Answer choices
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
VLAN 10 is a primary private VLAN.
The output shows VLAN 10 configured as a Primary VLAN with associated secondary VLANs 100 and 200, which is the defining characteristic of a primary private VLAN. This is confirmed by the fields 'Private VLAN Type: Primary' and 'Associated Secondary VLAN IDs: 100, 200'. Therefore, VLAN 10 is a primary private VLAN, not a normal data VLAN.
Key principle: Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
Answer analysis
For each option: why learners choose it and why it is or isn't the right answer here.
VLAN 10 is a community VLAN.
Why it's wrong here
It is a primary VLAN, not community.
VLAN 10 is an isolated VLAN.
Why it's wrong here
It is a primary VLAN.
VLAN 10 is a primary private VLAN.
Why this is correct
The output shows 'Private VLAN Type: Primary' and associated secondary VLANs.
Clue confirmation
The clue word "primary" in the question point toward this answer.
Related concept
Read the scenario before looking for a memorised answer.
VLAN 10 is a normal data VLAN with no private VLAN features.
Why it's wrong here
The output clearly indicates private VLAN configuration.
Common exam traps
Cisco often tests the distinction between the 'show vlan' output for a primary VLAN versus a secondary VLAN, and the trap here is that candidates mistakenly think the presence of 'Associated Secondary VLAN IDs' means the VLAN itself is a secondary VLAN, when in fact only the primary VLAN lists its associated secondary VLANs.
Trap categories for this question
Command / output trap
The output clearly indicates private VLAN configuration.
Detailed technical explanation
In a private VLAN (PVLAN) configuration, the primary VLAN (here VLAN 10) acts as the upstream trunk to the router or Layer 3 gateway, while secondary VLANs (100 and 200) provide isolation or community behavior at Layer 2. The 'show vlan id' command reveals the PVLAN type and associations, which is critical for troubleshooting multi-tenant environments where traffic isolation between hosts is required without using multiple subnets.
Key takeaway
Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
Real-world example
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
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FAQ
VLANs and Trunking — This question tests VLANs and Trunking — Read the scenario before looking for a memorised answer..
The correct answer is: VLAN 10 is a primary private VLAN. — The output shows VLAN 10 configured as a Primary VLAN with associated secondary VLANs 100 and 200, which is the defining characteristic of a primary private VLAN. This is confirmed by the fields 'Private VLAN Type: Primary' and 'Associated Secondary VLAN IDs: 100, 200'. Therefore, VLAN 10 is a primary private VLAN, not a normal data VLAN.
Identify which exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.
Yes — watch for: "primary". Asks for the main purpose or function, not a secondary benefit. Eliminate answers that describe side-effects or partial functions.
Read the scenario before looking for a memorised answer.
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Last reviewed: Jun 24, 2026
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