Akamai Technologies (AKAM) has agreed to by Prolexic, a maker of cloud-based security software.

Akamai plans to pay $370 million in cash for Prolexic, it announced Monday. It expects the deal to close in the first half of 2014, pending regulatory approval.

Akamai and Prolexic both offer systems to defend against distributed denial of services (DDoS) attacks. Prolexic also offers tools to protect against attacks on data centers and applications.

The acquisition lets Akamai offer a comprehensive group of products to defend against online attacks against a client's web and IP systems and its data centers, it said.

"By joining forces with Prolexic, we intend to combine Akamai's leading security and performance platform with Prolexic's highly regarded DDoS mitigation solutions for data center and enterprise applications protection," said Akamai Chief Executive Tom Leighton in the news release. "We believe that Prolexic's solutions and team will help us achieve our goal of making the Internet fast, reliable and secure."