A network engineer connects two routers back to back in a lab configuration. On RTR1, the commands ip address XXXXXXXXXX.255.0, encapsulation PPP, clock rate 64000, and no shutdown were entered on the...

A network engineer connects two routers back to back in a lab configuration. On RTR1, the commands ip address 192.168.1.1 255.255.255.0, encapsulation PPP, clock rate 64000, and no shutdown were entered on the serial interface. On RTR2, the commands ip address 192.168.1.2 255.255.255.0 and no shutdown were added to the serial interface. After verifying the serial cable is correctly installed (DCE end is plugged in on the correct side), a PING sent across the line fails. Why did the PING fail?

A. The clock rate 64000 command must be configured on RTR2’s serial interface.

B. Both ends of the connection require the bandwidth command.

C. The IP addresses are in two different subnets.

D. The encapsulation is not set correctly.