Global Edge -MicroSemi Interview

ethernet header
vlan header

there is an entry with mac address - vlan and if you receive a frame with same mac address and different vlan what will the switch do?

what will switch do if it receives a untagged frame on trunk port?
what will switch do if it receives a untagged frame on access port?

rstp convergence 

tcl - removing an element from the list

converting array to list in tcl

Interview Qns

Why ospf area is needed?
Why backbone area?
packet captures?
why sequence number in TCP?
BGP messages?