200-150 · Question #116
Which two options describe what can happen when devices are in the same broadcast domain? (Choose two.)
The correct answer is A. They are on the same VLAN and the same switch. D. They are on the same VLAN and different switches. A broadcast domain includes all devices that share the same VLAN, whether they are on one switch or connected across multiple switches through a trunk link.
Question
Which two options describe what can happen when devices are in the same broadcast domain? (Choose two.)
Options
- AThey are on the same VLAN and the same switch.
- BThey are on different VLANs and the same switch.
- CThey are on different VLANs and different switches.
- DThey are on the same VLAN and different switches.
How the community answered
(30 responses)- A93% (28)
- B3% (1)
- C3% (1)
Why each option
A broadcast domain includes all devices that share the same VLAN, whether they are on one switch or connected across multiple switches through a trunk link.
Devices on the same VLAN on the same switch share a broadcast domain because the switch forwards any broadcast frame to every port assigned to that VLAN. There is no Layer 3 boundary to block the broadcast from reaching any member of the VLAN.
Devices on different VLANs on the same physical switch are in separate broadcast domains; VLANs create logical segmentation that prevents broadcasts in one VLAN from being forwarded to any other VLAN.
Devices on different VLANs across different switches are in separate broadcast domains; the combination of separate VLANs and separate physical switches means there is no shared broadcast boundary between them.
Devices on the same VLAN across different switches connected by an 802.1Q trunk also share the same broadcast domain because the trunk carries VLAN-tagged frames between switches, extending the domain transparently across physical boundaries.
Concept tested: VLAN broadcast domain boundaries across switches
Source: https://www.cisco.com/c/en/us/support/docs/lan-switching/ethernet/10561-3.html
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