Consider again the SDN OpenFlow network in the attached figure. Suppose we want switch s$2$ to function as a firewall.

Specify the flow table in s$2$ that implements the following firewall behaviors. Specify a different flow table for each of the four firewalling behaviors below. You do not need to specify the forwarding behavior in s$2$ that forwards traffic to other routers.

a$)$ Only traffic arriving from hosts h$1$ and h$6$ should be delivered to hosts h$3$ or h$4($i$.$e$.,$ that arriving traffic from hosts h$2$ and h$5$ is blocked$).$

b$)$ Only TCP traffic is allowed to be delivered to hosts h$3$ or h$4($i$.$e$.,$ that UDP traffic is blocked$).$

c$)$ Only traffic destined to h$3$ is to be delivered $($i$.$e$.,$ all traffic to h$4$ is blocked$).$

d$)$ Only UDP traffic from h$1$ and destined to h$3$ is to be delivered. All other traffic is blocked.