A $\_\_\_\_\_\_\_\_$ gateway sets up two TCP connections, one between itself and a TCP user on an inner host, and one between itself and a TCP user on an outside host.

Question $13$ options:

a$)$

application$-$level

b$)$

packet$-$filtering

c$)$

DMZ

d$)$

circuit$-$level

e$)$

stateful inspection