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Compared to legacy network topology, software-defined networking (SDN)/network functions virtualization (NFV) topology migrates control in hardware such as switch into a software application, which is called a controller. In SDN/NFV topology, a network administrator can customize switching policies across multi-vendor hardware in a centralized manner and thus, the organizations can respond to their various business requirements to reduce capital expenditures (CAPEX) and operating expenses (OPEX). In this paper, we overview a methodology, which is called a security service chain (SSC), for providing security functions into SDN/NFV topology by chaining virtual security services, such as virtual load balancers and virtual firewalls.