To increase protection the rule set is changed as follows: Firewall rule Directi
ID: 3866753 • Letter: T
Question
To increase protection the rule set is changed as follows:
Firewall rule
Direction
Source addr
Dest addr
Src Port
Dest port
Protocol
Action
A
In
external
internal
>1023
25
TCP
permit
B
Out
Internal
external
25
*
TCP
permit
C
Out
Internal
external
>1023
25
TCP
permit
D
In
External
internal
25
*
TCP
permit
E
Either
*
*
Any
*
*
deny
Apply this new rule set to the same six packets used before. Indicate which packets are permitted or denied and which rule is used in each case. So for each packet, make sure you specify if it is permitted or denied followed by the rule in brackets (). For example: Denied (D)
Packet
Src Addr
Dest Addr
Protocol
Dest Port
Action
1
192.168.3.4
172.16.1.1
TCP
25
2
172.16.1.1
192.168.3.4
TCP
1234
3
172.16.1.1
192.168.3.4
TCP
25
4
192.168.3.4
172.16.1.1
TCP
1432
Packet
Direction
Src Addr
Dest Addr
Protocol
Dest Port
Action
5
In
10.1.2.4
172.16.1.1
TCP
8080
6
Out
172.16.3.4
10.1.2.4
TCP
5150
Firewall rule
Direction
Source addr
Dest addr
Src Port
Dest port
Protocol
Action
A
In
external
internal
>1023
25
TCP
permit
B
Out
Internal
external
25
*
TCP
permit
C
Out
Internal
external
>1023
25
TCP
permit
D
In
External
internal
25
*
TCP
permit
E
Either
*
*
Any
*
*
deny
Explanation / Answer
1. P(A) -- It is permitted as per rule A
2. P(B) -- It is permitted as per rule B
3. P(C) -- It is permitted as per rule C
4. P(D) -- It is permitted as per rule D
5. D(A) -- It is denied as per rule A
6. D(C) -- It is denied as per rule C
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