To simplify \( \frac{7^{11}}{7^{-4}} \), we can use the property of exponents that states:
\[ \frac{a^m}{a^n} = a^{m-n} \]
Here, \( a = 7 \), \( m = 11 \), and \( n = -4 \).
Now, we can apply the property:
\[ \frac{7^{11}}{7^{-4}} = 7^{11 - (-4)} = 7^{11 + 4} = 7^{15} \]
Thus, the simplified form is:
\[ \boxed{7^{15}} \]