Question:

A network administrator configures a router with the following IP address information:
Gigabit Ethernet 1 Interface: 10.10.0.1/24
Serial 0 Interface: 10.10.0.253/30
Customers are connected to a switch on the gigabit Ethernet interface; the ISP is accessed to the Serial 0 interface. When the router configuration is accomplished and customer devices are reconfigured, all customers complain that they can not access the Internet. Choose the MOST likely reason?