String network and 1/4 BPS states in N=4 SU(N) supersymmetric Yang-Mills theory

We construct the classical configurations of BPS states with 1/4 unbroken supersymmetries in four-dimensional N=4 SU(N+1) supersymmetric Yang-Mills theory, and discuss that these configurations correspond to string networks connecting (N+1) D3-branes in Type IIB string theory.