I must admit that I did not experience in using Access Control List and I need some help on the project that should do it.
Using a text editor ( e.g. Notepad ) I have to write down the commands necessary to create appropriate access list and apply them to router interface so that the following IP traffic restrictions are implemented:

- Computers on segments G, H, I and J do not communicate with any computers on segments A, B, C, D and E .
- There is no FTP traffic between computers on Segment C and computers labeled "Linux system" on segment L

Subnet Adress :

A -> 192.168.250.16 and 192.168.250.208
B -> 192.168.250.32 and 192.168.250.224
C -> 192.168.250.48
D -> 192.168.250.64
E -> 192.168.250.80
F -> 192.168.250.96
G -> 192.168.250.112
H -> 192.168.250.128
I -> 192.168.250.144
J -> 192.168.250.160
K -> 192.168.250.176
L -> 192.168.250.192

Segments A B C D E are connected to the router 1
Segments G H I J are connected to the router 2
Router 2 are connected to router 3 through Segment K
Router 3 are connected to router 4 through Segment L
The segment L have Linux System .
Router 4 are connected to Internet ( ISDN )

Thank you

try to make a design for us, visio would be a great tool for U.

Otherwise, this problem will be like Einstein IQ test for normal people.

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GNS3 Lab Workbook v0.2

nice answer :) I solved the problem tks .Was not so hard but for me was confusing . Tks anyway