In Cisco Packet Tracer, you can simulate this scenario by configuring access control lists (ACLs) on routers to control the flow of traffic between the networks. Here's a basic example: Procedure 1. **Create the Networks:** - Place three routers on the workspace and label them R1, R2, and R3. - Connect the routers as follows: - Connect R1 to R2 and R3. - Connect R2 to R3. - Assign IP addresses to the router interfaces for each network (N1, N2, N3). 2. **Configure Router ACLs:** - Access the CLI of each router. For R1 (assuming FastEthernet interfaces): ```bash enable configure terminal interface FastEthernet0/0 ip address <N1_IP> <Subnet_Mask> exit interface FastEthernet0/1 ip address <N2_IP> <Subnet_Mask> exit access-li...