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Identify the network a connection matrix describes

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A computer network records direct links between devices

The vertex order for the rows and columns is Server, Router, Printer. Entry \(m_{ij}\) counts direct connections from the row vertex \(i\) to the column vertex \(j\). Every connection is two-way

M = \begin{bmatrix} 0 & 1 & 0 \\ 1 & 0 & 1 \\ 0 & 1 & 0 \end{bmatrix}