JN0-102 · Question #279
Which two statements are correct about Layer 2 broadcast frames? (Choose two.)
The correct answer is A. Layer 2 broadcast frames are processed by all devices on the same VLAN. D. Layer 2 broadcast frames are relayed by switches to devices on the same VLAN. This question focuses on how Layer 2 broadcast frames are handled by network devices, specifically within VLANs and by switches and routers.
Question
Which two statements are correct about Layer 2 broadcast frames? (Choose two.)
Options
- ALayer 2 broadcast frames are processed by all devices on the same VLAN.
- BLayer 2 broadcast frames are discarded by routers that connect to multiple VLANs.
- CLayer 2 broadcast frames are relayed by routers to all connected VLANs.
- DLayer 2 broadcast frames are relayed by switches to devices on the same VLAN.
How the community answered
(19 responses)- A95% (18)
- B5% (1)
Why each option
This question focuses on how Layer 2 broadcast frames are handled by network devices, specifically within VLANs and by switches and routers.
All devices within the same VLAN are part of the same broadcast domain, meaning they will receive and process Layer 2 broadcast frames originated within that VLAN.
Routers do not forward Layer 2 broadcast frames across different broadcast domains (VLANs or subnets); instead, they drop such frames to prevent broadcast storms.
Routers act as boundaries for broadcast domains and do not relay Layer 2 broadcast frames to other connected VLANs or networks.
Switches, by design, flood Layer 2 broadcast frames out of all ports within the same VLAN, except the incoming port, ensuring that all devices on that VLAN receive the broadcast.
Concept tested: Layer 2 broadcast behavior
Source: https://www.cisco.com/c/en/us/td/docs/switches/lan/catalyst6500/ios/12-2SX/configuration/guide/book/vlan.html
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