problem 11 number of needed usable hosts network address address class default subnet mask custom subnet mask total number of subnets total number of host addresses number of usable addresses number of bits borrowed 8,000 135.70.0.0 what is the 6th subnet range? what is the subnet number for the 7th subnet? what is the subnet broadcast address for the 3rd subnet? what are the assignable addresses for the 5th subnet?