b. Using the -t option, ping External to verify that External is reachable. C:\Users\User1> ping -t 209.165.200.226 To illustrate the results when a host is unreachable, shut down the GigabitEthernet 0/0/1 interface on the ISP router. While the network is functioning correctly, the ping command can determine whether the destination responded and how long it took to receive a reply from the destination. If a network connectivity problem exists, the ping command displays an error message. c. Enable the GigabitEthernet 0/0/1 interface on the ISP router (using the no shutdown command) before moving onto the next step. After about 30 seconds, the ping should be successful again.

How do I shutdown the G/0/0/1 interface using netlab?