A Layer 2 switch receives an Ethernet frame with a unicast destination MAC address that does not currently exist in its MAC address table. Which two actions does the switch take upon receiving this frame?
- It floods the frame out all active interfaces in the VLAN except the ingress port.Cevap
- It examines the source MAC address of the frame and updates its MAC address table if the entry is missing.Cevap
- CIt drops the frame immediately because the destination MAC address is unresolvable.
- DIt forwards the frame to the default gateway router for MAC address resolution.
- EIt sends a Layer 2 discovery protocol message to discover which port owns the destination MAC address.
Cevap
The switch populates its MAC address table using the ingress frame's source MAC address and floods the frame out all active switch ports within the VLAN, excluding the port on which the frame arrived.
When a Layer 2 switch receives a frame, it always inspects the source MAC address to learn or update its location in the MAC address table. If the destination MAC address is unknown, the switch performs an unknown unicast flood by forwarding the frame to all active interfaces in the VLAN, except the port on which the frame was received.
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Anahtar Kavram
Switch learning mechanics and unknown unicast flooding