Which application protocol cannot be blocked by Switch?

[KATTUBAVA E.S]

Hi Experts,

In general which application protocol can't be blocked by the switch? It would be great if you could explain with an example.

Thanks in advance

[Leo Laohoo]

In general which application protocol can't be blocked by the switch? It would be great if you could explain with an example.

Is this a trick question?   A switch deals primarily with MAC address.  A switch cannot "see" upper layer protocols.