Irvine-based semiconductor giant Broadcom is making another acquisition, saying Monday afternoon that it has signed a definitive agreement to acquired Dune Networks, a developer of switching fabric products for the data center networking market. Broadcom said it will pay approximately $178M net of cash for Dune, in an all-cash deal. Dune Networks has operations in Sunnyvale, California, and Yakum, Israel. Dune Networks is venture backed by such firms as Alta Berkeley Venture Partners, Aurum-SBC Ventures, Elwin Capital Partners, Evergreen Venture Partners, Jerusalem Venture Partners, Pitango Venture Capital, Siemens Venture Capital, and US Venture Partners.