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 interfaces gi0/1 switchport
Name: Gi0/1
Switchport: Enabled
Administrative Mode: trunk Operational Mode: trunk Administrative Trunking Encapsulation: dot1q Operational Trunking Encapsulation: dot1q Negotiation of Trunking: On Access Mode VLAN: 1 (default) Trunking Native Mode VLAN: 1 (default) Administrative Native VLAN tagging: enabled Voice VLAN: none Administrative private-vlan host-association: none Administrative private-vlan mapping: none Administrative private-vlan trunk native VLAN: none Administrative private-vlan trunk Native VLAN tagging: enabled Administrative private-vlan trunk encapsulation: dot1q Administrative private-vlan trunk normal VLANs: none Administrative private-vlan trunk private VLANs: none Operational private-vlan: none Trunking VLANs Enabled: ALL Pruning VLANs Enabled: 2-1001 Capture Mode Disabled Capture VLANs Allowed: ALL
Based on this output, what can be concluded?
⚠ Common exam trap
Cisco often tests the distinction between 'Pruning VLANs Enabled' and 'Trunking VLANs Enabled', where candidates mistakenly think that VLANs listed under pruning are actively removed from the trunk, when in fact they are only eligible for pruning if VTP pruning is enabled.
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
✓
DTP is enabled on this interface.
The output shows 'Negotiation of Trunking: On', which indicates that Dynamic Trunking Protocol (DTP) is enabled on the interface. DTP is a Cisco proprietary protocol used to negotiate trunking between switches. Since the interface is in trunk mode and DTP is on, option B is correct.
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 interface is configured as an access port.
Why it's wrong here
The show interfaces trunk output explicitly lists the Administrative Mode as 'trunk' and the Operational Mode as 'trunk', which directly contradicts the assertion that the interface is configured as an access port. An access port would have an administrative mode of 'static access' or 'dynamic auto' and would not appear in the trunk output. Therefore, this conclusion is unsupported by the command output.
- ✓
DTP is enabled on this interface.
Why this is correct
The command output includes the line 'Negotiation of Trunking: On', which confirms that Dynamic Trunking Protocol (DTP) is enabled and actively attempting to negotiate trunking with the connected neighbor. DTP is a Cisco proprietary protocol that allows the interface to dynamically decide between access and trunk mode. This is the correct and directly supported conclusion from the provided switchport trunk information.
- ✗
The native VLAN is tagged with 802.1Q.
Why it's wrong here
Actually, native VLAN tagging is enabled, meaning the native VLAN is tagged, but the statement is ambiguous. However, the correct interpretation is that native VLAN tagging is enabled, but the question asks what can be concluded. Option B is more directly supported.
- ✗
All VLANs except 2-1001 are pruned.
Why it's wrong here
The line 'Pruning VLANs Enabled: 2-1001' indicates that VLANs 2 through 1001 are eligible for pruning, meaning the switch may remove them from the trunk for load balancing if the neighbor does not use them. It does not state that these VLANs are actually being pruned, nor does it imply that all other VLANs are pruned. The phrasing 'except 2-1001 are pruned' inverts the correct meaning, confusing eligibility with active pruning.
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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.