Can protected data accessed in derived class? If yes...then how??

Answer 1

What do you mean how? A protected member of a base class is usable in the derived class, just as if it was public to that derived class only.

class Animal
{
protected:
short legs;
};

class Dog : public Animal
{
public:
Dog()
{
legs = 4;
}
};

Answer 2

definitely only private you cant use in derived class.
you can use direct as you are using in base class.
but form the another function you cant use.