  Quantum networks are an integral component in performing efficient
computation and communication tasks that are not accessible using classical
systems. A key aspect in designing an effective and scalable quantum network is
generating entanglement between its nodes, which is robust against defects in
the network. We consider an isotropic quantum network of spin-1/2 particles
with a finite fraction of defects, where the corresponding wave function of the
network is rotationally invariant under the action of local unitaries, and we
show that any reduced density matrix also remains unaltered under the local
actions. By using quantum information-theoretic concepts like strong
subadditivity of von Neumann entropy and approximate quantum telecloning, we
prove analytically that in the presence of defects, caused by loss of a finite
fraction of spins, the network sustains genuine multisite entanglement, and at
the same time may exhibit finite moderate-range bipartite entanglement, in
contrast to the network with no defects.
