200-301 Question #220: Real Exam Question with Answer & Explanation

Question

Refer to the exhibit. Which action is expected from SW1 when the untagged frame is received on the GigabitEthernet0/1 interface?

Options

• AThe frame is processed in VLAN 1
• BThe frame is processed in VLAN 11
• CThe frame is processed in VLAN 5
• DThe frame is dropped

Explanation

When an untagged frame is received on SW1's GigabitEthernet0/1 interface, it is processed within VLAN 5, indicating that this VLAN is configured as the access or native VLAN for that port.

Common mistakes.

• A. VLAN 1 is the default native VLAN but not necessarily the configured access or native VLAN for GigabitEthernet0/1.
• B. VLAN 11 is an arbitrary VLAN and not necessarily the configured access or native VLAN for GigabitEthernet0/1.
• D. An untagged frame is typically processed and assigned to a VLAN, not dropped, unless there are specific port security or error conditions.

Concept tested. Native VLAN and access port processing

Reference. https://www.cisco.com/c/en/us/td/docs/switches/lan/catalyst3850/software/release/3se/vlan/configuration_guide/b_vlan_3se_3850_cg/b_vlan_3se_3850_cg_chapter_010.html

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