Firewall

Question 1

Stateless

Answer 1

Does not see the state of the connection, in and out are seeen as two separate connections

Question 2

Stateless Firewall challenge

Answer 2

In a stateless connection, request is from a known Port but response can be from any Port, hence ephemeral Port has to be kept open, which is a security risk.

Question 3

Stateful Firewall

Answer 3

Automatically detects the response route and opens it for response to the request