Vlan access map - Block generic mac address`s

Guys,

i am trying to think of CCIE type TS/Config questions and i was thinking about mac address blocking within VACL`s

Q , make sure application/protocol X cannot be accesed through or in vlan 10 without using ip address matching .. 

i know HSRP has a generic mac that you could block  ,

and multicast does have  mac-address`s you could also block

do you guys know of any other application/protocols that use a generic mac , that could be blocked ??

cheers

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