Cisco has now closed the second of three major multibillion-dollar acquisitions that it initiated in October. Today, the networking giant announced that it has wrapped up the acquisition of Starent Networks (NASDAQ: STAR) for $2.9 billion.

Cisco (NASDAQ: CSCO) originally announced its plans to buy Starent on Oct. 13. The smaller company's shareholders approved the deal on Dec. 11 and U.S. Department of Justice and Federal Trade Commission gave the transaction the go-ahead three days later.

Starent is a mobile Internet Protocol (IP) vendor that Cisco maintains will help to fill a gap in its wireless networking portfolio. One the define) market, a closely watched next-generation wireless broadband technology. A key Starent business is providing the gateways linking LTE to IP networks.

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