Shanes company lost their WAN link due to severe weather conditions. The company experienced a loss of $240,000 over the four hours their Web servers were unable to accept customer purchases. Shane has been told to implement a backup option, so that company will not go through this again. Which of the following would Shane implement?

A.
MPLS

B.
Dial-on demand routing

C.
IGMP

D.
Link-state redundant point-to-point connection

Explanation:
Dial-on Demand Routing (DDR) allows a company to send WAN data over
their existing telephone lines and use the public circuit-switched network as a
temporary type of WAN link. This technology is also implemented as a backup in case
the primary WAN link goes down. It provides redundancy and ensures that a company
will still be able to communicate if something happens to the primary WAN
communication channel.