Display filter help need. how to do these filters? DNS /L2 overhead

[false <jctx09 () yahoo com>]

Can someone provide an example please on how to do these filters (display and/or capture)?

1) DNS filter to see how all UNANSWERED queries. ??


2) L2 Overhead - Can I get filter out all L2 overhead to see what the total amount of data sent was with and without L2 
overhead. ??

Thank you,

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