Furnace running.Shuting off for a few mins then starting again.Continued process
If the home is maintaining the temperature set on the thermostat (at least AT the thermostat) then it's probable that you are near, but not quite at, "design load" for the furnace. At design load, the furnace runs 100% of the time to keep up with heat loss in the house and maintain temperature - if it gets colder than that outside (below the "design temperature"), the house gets colder than set. At anything less than design load, the furnace runs a fraction of the time, and is off a fraction of the time. The closer the outside temperature is to "design temperature" the longer the run time and shorter the off time. As it gets warmer outside, the off time increases and the run time gets shorter. 

Anything that makes the house lose heat faster raises the effective design temperature (doesn't change what temperature was assumed to design it, but alters the actual one.)

Anything that makes the house lose heat slower lowers the  effective design temperature (doesn't change what temperature was assumed to design it, but alters the actual one.)

If the house is NOT maintaining the set temperature AND the furnace is shutting off regularly, something may be in need of maintenance/adjustment.