200-301 · Question #220
Refer to the exhibit. Which action is expected from SW1 when the untagged frame is received on the GigabitEthernet0/1 interface?
The correct answer is C. The frame is processed in VLAN 5. 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.
Question
Refer to the exhibit. Which action is expected from SW1 when the untagged frame is received on the GigabitEthernet0/1 interface?
Exhibits
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
How the community answered
(40 responses)- A15% (6)
- B5% (2)
- C73% (29)
- D8% (3)
Why each option
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.
VLAN 1 is the default native VLAN but not necessarily the configured access or native VLAN for GigabitEthernet0/1.
VLAN 11 is an arbitrary VLAN and not necessarily the configured access or native VLAN for GigabitEthernet0/1.
On a Cisco switch, an untagged frame received on a port is assigned to the VLAN configured for that access port or to the native VLAN if the port is a trunk port. Since VLAN 5 is the correct answer, GigabitEthernet0/1 must be configured as an access port in VLAN 5 or as a trunk port with native VLAN 5.
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
Source: 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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