Firewall Interface Question

dppagc

Hi,

How am I supposed to verify the interface in which a firewall (checkpoint or cisco)is connected to the network?
Is it usually Layer 2 or Layer 3?
I am a routing & switching guy so this is new to me.

MAC_Addy

As a routing ans switching guy, you should know the answer to this. How do you verify that an interface is up normally?