During the CCIE lab we may require to add up static routes in the Test PC and ACS machine because there is no default gateway due to some reasons . Similar is the case with rack rentals . I normally do it using route add x.x.x.x MASK x.x.x.x x.x.x.x . Recently someone told me that we need to also add -p which means route persistent with that command .
If we dont use -p we can loose marks because the exam is checked using a script and not by a real proctor , also there are chances that they restart the ACS machine or the test PC and because of which normal routes gets deleted . Once the routes get deleted upon restart script may start checking those things and would mark the section with ZERO marks if there is no route .