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CIT 249 Review Questions 1

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You have a router connected to the Internet through the Serial0/0/0 interface. You want to increase the security of your router by adding access lists to prevent traffic that matches patterns of known Internet attacks. The design you will implement in this scenario applies access lists to the Internet-connected interface of your router. The access lists will do the following: Prevent the router from receiving packets from the Internet with a source address within the private IP address ranges. Prevent the router from receiving packets from the Internet with a source address from the 127.0.0.0 reserved address. Prevent the router from receiving packets from the Internet with a source address that matches the IP address assigned to the interface. Prevent the router from sending packets onto the Internet with a destination address within the private IP address ranges. Complete the following tasks: Create an extended access list 110 as follows: Deny all IP traffic from network 192.168.0.0/16. Deny all IP traffic from network 172.16.0.0/12. Deny all IP traffic from network 10.0.0.0/8. Deny all IP traffic from network 127.0.0.0/8. Deny all IP traffic from host 168.70.50.33 (the IP address assigned to the Serial0/0/0 interface). Allow all other IP traffic. Apply the access list to Serial0/0/0 for inbound traffic to prevent the router from accepting packets from these networks. Create an extended access list 120 as follows: Deny all IP traffic sent to network 192.168.0.0/16. Deny all IP traffic sent to network 172.16.0.0/12. Deny all IP traffic sent to network 10.0.0.0/8. Allow all other IP traffic. Apply the access list to Serial0/0/0 for outbound traffic to prevent the router from sending packets to these destination networks. Save your changes.

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