Arbor Networks Inc., a Chelmsford-based provider of network security and management services, said Wednesday that it plans to relocate its corporate headquarters to Burlington later this year.

At 40,000 square feet, the new Burlington space is roughly the same size as the company’s existing facilities in Chelmsford, but the new space is better customized to meet Arbor’s needs for a research and equipment testing, the company said in a press release.

Currently, 98 employees work at Arbor’s headquarters location, and there are plans to add nine more.

Besides the Burlington relocation, Arbor said it is expanding its research, development, and engineering facilities in Ann Arbor, Mich., and Atlanta. Company-wide, there are 46 job openings.

Arbor Network is one of many companies that defend the Internet from distributed denial of service, or DDOS, attacks, a favorite disruptive strategy of criminals, protestors, and vandals around the world.

In providing protection to its customers from DDOS attacks, Arbor is “in a technology and market sweet spot,” company vice president of engineering Kris Lamb said in a statement.