In September 1993, Cisco Systems acquired Crescendo Communications, marking Cisco’s first acquisition and foray into the switching market. Ullal joined Cisco and began work on the Cisco Catalyst switching Business, which grew from its beginning, in 1993, to a $5 billion Business in 2000. As vice President and general manager of LAN switching in the Enterprise group, Ullal was responsible for unified communications, IP telephony, content networking and policy networking. She oversaw some 20 mergers and acquisitions for Cisco in the enterprise sector.