On Router A, disable CDP on the s0/1/1 interface, implement ACL 25 to deny traffic from host 199.68.111.199, permit others, and apply it to s0/1/1. Set the clock rate to 64000 on s0/1/0. On Router B, set the hostname to mainofficertr. Save configurations.
I can guide you through the configuration steps for the tasks you've described on Router A and Router B. Please note that the commands may vary slightly based on the specific router model and operating system. Make sure to replace placeholder values with your actual network information.
Router A Configuration:
1. Disable CDP on the s0/1/1 interface connected to the internet:
```
RouterA(config)# interface s0/1/1
RouterA(config-if)# no cdp enable
```
2. Implement an access control list (ACL) to deny traffic from host 199.68.111.199 and permit traffic from any other host, applying it inbound on the serial 0/1/1 interface:
```
RouterA(config)# access-list 25 deny host 199.68.111.199
RouterA(config)# access-list 25 permit any
RouterA(config)# interface s0/1/1
RouterA(config-if)# ip access-group 25 in
```
3. Set the clock rate to 64000 on interface s0/1/0 connected to Router B:
```
RouterA(config)# interface s0/1/0
RouterA(config-if)# clock rate 64000
```
Router B Configuration:
4. Set the router hostname to mainofficertr:
```
RouterB(config)# hostname mainofficertr
```
After applying these configurations, make sure to save the changes to the configuration file. On most routers, this is done using the `write memory` or `copy running-config startup-config` command.
Remember to adapt the configurations to fit the specific syntax and capabilities of your router model and software version. If you encounter any issues, refer to the router documentation or seek assistance from your network administrator.