Consider again the SDN Open Flow network shown in Figure 4.30. Suppose we want switch s2 to function as a firewall. Specify the flow table in s2 that implements the following firewall behaviors (specify a different flow table for each of the four fire walling behaviors below) for delivery of data-grams destined to h3 and h4. You do not need to specify the forwarding behavior in s2 that forwards traffic to other routers.

• Only traffic arriving from hosts hi and h6 should be delivered to hosts h3 or h4 (i.e., that arriving traffic from hosts h2 and h5 is blocked).
• Only TCP traffic is allowed to be delivered to hosts h3 or h4 (i.e., that UDP traffic is blocked).
• Only traffic destined to h3 is to be delivered (i.e., all traffic to h4 is blocked).
• Only UDP traffic from hi and destined to h3 is to he delivered. All other traffic is blocked.