For the following problems, assume the following firewall rule table is being used to protect a local network that you administer:

Rule	Direction	Src addr	Dest addr	Protocol	Dest port	Action
A	In	External	Internal	TCP	25	Permit
B	Out	Internal	External	TCP	>1023	Permit
C	Out	Internal	External	TCP	25	Permit
D	In	External	Internal	TCP	>1023	Permit
E	Either	Any	Any	Any	Any	Deny

(5 pts) Describe the effect of each rule.

(4 pts) Your SMTP server on this network has address 192.168.3.4. A remote server with IP 172.16.1.1 tries to initiate a dialogue with your host. Additionally, a process on your server will try to send email to the SMTP server on the remote system. The following packets could represent part of such an exchange:

Packet	Direction	Src addr	Dest addr	Protocol	Dest port	Action
1	In	172.16.1.1	192.168.3.4	TCP	25	?
2	Out	192.168.3.4	172.16.1.1	TCP	1234	?
3	Out	192.168.3.4	172.16.1.1	TCP	25	?
4	In	172.16.1.1	192.168.3.4	TCP	1357	?

For each packet, state whether it is permitted or denied by the rules above, and tell which rule applies.