Currently your routers have no security features configured on them beyond enable secret passwords and login passwords on the vty lines for Telnet access. All of the vty lines share the same password. You decide to implement some security features. Here is what you want to do:

1. Configure each of the routers with passwords for Console access.
2. "Reserve" one vty line on each router for your own access by setting a different password on it.
3. Change the enable secret password on all the routers.
4. Configure access lists on each router to allow Telnet connections only from your workstation (IP address 172.18.56.14)
5. Configure access lists on each router to deny all ping requests sent to the routers from workstation (IP address 172.18.56.16)
6. Log any traffic that is denied by the access lists that you implement.
7. Make sure that no other network traffic is impacted by the implementation of these access lists.