To simplify the expression \((8^{11})^2\), you can use the power of a power property of exponents, which states that \((a^m)^n = a^{m \cdot n}\).
Applying this property:
\[ (8^{11})^2 = 8^{11 \cdot 2} \]
Now, compute \(11 \cdot 2\):
\[ 11 \cdot 2 = 22 \]
Thus, we have:
\[ (8^{11})^2 = 8^{22} \]
So the simplified expression is:
\[ \boxed{8^{22}} \]