Let $n$ be a non-negative integer. Find all non-negative integers $a$, $b$, $c$, $d$ such that \[a^{2}+b^{2}+c^{2}+d^{2}= 7 \cdot 4^{n}.\]
1. We start by analyzing the given equation \(a^2 + b^2 + c^2 + d^2 = 7 \cdot 4^n\) for non-negative integers \(a, b, c, d\).

2. For \(n = 0\):
   \[
   a^2 + b^2 + c^2 + d^2 = 7 \cdot 4^0 = 7
   \]
   The only non-negative integer solutions to this equation are \((a, b, c, d) = (2, 1, 1, 1)\).

3. For \(n = 1\):
   \[
   a^2 + b^2 + c^2 + d^2 = 7 \cdot 4^1 = 28
   \]
   We need to find all sets of non-negative integers \((a, b, c, d)\) such that their squares sum to 28. The possible solutions are:
   \[
   (5, 1, 1, 1), \quad (4, 2, 2, 2), \quad (3, 3, 3, 1)
   \]

4. For \(n \geq 2\):
   \[
   a^2 + b^2 + c^2 + d^2 = 7 \cdot 4^n = 8k \quad \text{where} \quad k = 7 \cdot 4^{n-1}
   \]
   Since \(x^2 \mod 8 \in \{0, 1, 4\}\), and the sum \(a^2 + b^2 + c^2 + d^2\) is a multiple of 8, all \(a, b, c, d\) must be even. Let \(a = 2a'\), \(b = 2b'\), \(c = 2c'\), \(d = 2d'\). Then:
   \[
   (2a')^2 + (2b')^2 + (2c')^2 + (2d')^2 = 7 \cdot 4^n
   \]
   Simplifying, we get:
   \[
   4(a'^2 + b'^2 + c'^2 + d'^2) = 7 \cdot 4^n
   \]
   Dividing both sides by 4:
   \[
   a'^2 + b'^2 + c'^2 + d'^2 = 7 \cdot 4^{n-1}
   \]
   We can repeat this process until the exponent of 4 is less than 2. This leads us to the following solutions:
   \[
   (a, b, c, d) = (5 \cdot 2^{n-1}, 2^{n-1}, 2^{n-1}, 2^{n-1})
   \]
   \[
   (a, b, c, d) = (2^{n+1}, 2^n, 2^n, 2^n)
   \]
   \[
   (a, b, c, d) = (3 \cdot 2^{n-1}, 3 \cdot 2^{n-1}, 3 \cdot 2^{n-1}, 2^{n-1})
   \]

5. Disregarding the condition \(a \geq b \geq c \geq d\), we obtain all possible solutions.

The final answer is \( \boxed{ (5 \cdot 2^{n-1}, 2^{n-1}, 2^{n-1}, 2^{n-1}) } \), \((2^{n+1}, 2^n, 2^n, 2^n)\), \((3 \cdot 2^{n-1}, 3 \cdot 2^{n-1}, 3 \cdot 2^{n-1}, 2^{n-1})\).