hardMultiple ChoiceObjective-mapped
200-901 Practice Question: Refer to the exhibit
Exhibit
SwitchA# show running-config interface port-channel1 ! interface Port-channel1 switchport mode trunk switchport trunk allowed vlan 1-100,200 SwitchB# show running-config interface port-channel1 ! interface Port-channel1 switchport mode trunk switchport trunk allowed vlan 1-50,100-199
Refer to the exhibit. Both switches are configured with EtherChannel. Which statement is true about VLAN traffic across the trunk?
⚠ Common exam trap
Cisco often tests the misconception that EtherChannel overrides or bypasses VLAN trunk filtering, but in reality, the allowed VLAN list on the port-channel interface still controls which VLANs are permitted across the aggregated link.
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
✓
VLAN 100 traffic is allowed across the trunk.
The exhibit shows that VLAN 100 is configured on both switches and is included in the allowed VLAN list on the trunk. EtherChannel does not affect VLAN filtering; the trunk's allowed VLAN list determines which VLANs can traverse the link. Since VLAN 100 is explicitly permitted, its traffic is allowed across the trunk.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✗
VLAN 150 traffic is allowed across the trunk.
Why it's wrong here
VLAN 150 is not in SwitchA's allowed list.
- ✗
VLAN 50 traffic is blocked across the trunk.
Why it's wrong here
VLAN 50 is allowed on both switches.
- ✗
VLAN 200 traffic is allowed across the trunk.
Why it's wrong here
VLAN 200 is not allowed on SwitchB.
- ✓
VLAN 100 traffic is allowed across the trunk.
Why this is correct
VLAN 100 is allowed on both switches (1-100 on A, 100-199 on B).
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Written by Johnson Ajibi, MSc IT Security
Senior Network & Security Engineer · founder of Courseiva
This 200-901 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 200-901 exam.