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UNKNOWN /Unicast-Multicast and Broadcast Terminology

I have encontered some words that are not really clear to understand such as:

Unknown Unicast, is it a Broadcast ?
Unknown Multicast ?

any clarifications ?

Thank you

SOLUTION

David Johnson, CD

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jskfan

ASKER

I checked the link above http://ieoc.com/forums/t/29903.aspx

<<The main difference is that broadcast frames are by nature meant to be sent to all ports in the specific VLAN>>

Ok the Broadcast is clear

the Unknown Unicast is not clear , on the same site it says :
<< while unknown unicast are only initially sent to all ports - once the outgoing port is learned, the switch will only forward it out the port where the receiver is located.>>

Initially sent to all ports ? are all ports on the switch or all ports on the same VLAN ?

Not clear yet

David Johnson, CD

all ports just like a broadcast packet. it is so it can learn the path and port for future reference.

jskfan

ASKER

so where is the difference between Unknown Unicast and Broadcast?

David Johnson, CD

The packet header is different

jskfan

ASKER