While server-centric data center networking schemes partly resolve the performance bottleneck and extensibility problems in existing tree-based networking schemes, designing a high extensible data center networking scheme with high performance is still a challenging problem. This paper proposes a high extensible and high performance data center networking scheme, called XDCent, where servers have fixed number of network interface card (NIC) ports. In the case that each server has the fixed number of NICs, XDCent can not only result in a high performance for data centers but also extend data centers continually without affecting the running applications.