Which circuit-switched WAN technology is often used to provide a backup for a leased line and additional capacity during peak usage times?

When using Word's mail merge to create form lettersthe first task is to? What places is a scanner used? Given default priority what switch is elected to root bridge? What is the purpose of ddr2 pc2 6400? Can you make a UTAU character of your own? The part of the computer that holds the processor? Why does going on the computer for long periods of time make you have to go to the bathroom? Describe Porter's five forces analysis of Nestle? Describe a procedure you can use to check that the calculation performed by a software package are correct? What is halway between Elmhurst IL and Kenosha WI? Block diagram of touch screens? What do laptops used to add functionality to the laptop? The definition of commadites? What are row headers? What would cause a Windows xp Home version to suddenly stop playing sound out of both speakers when all of the plugs are plugged in the speakers are turned on and the computer is not muted? How do you graph an r on desmos? Does the Dell Vostro 1520 have a built in microphone How do you you get an external microphone to work I plugged the microphone in and I can hear the voice on Rosetta Stone but it does not hear me? How many gallons is 174 oz? Can I use different ram cards? Where did claes oldenburg study art?

Which circuit-switched WAN technology is often used to provide a backup for a leased line and additional capacity during peak usage times?