DALIAN, China — Cisco is "very optimistic" about its growing business with Chinese electric car companies as they expand overseas, the company's Greater China head told CNBC on Tuesday.The EV segment is the U.S. tech giant's second-largest for the region — Cisco generates most of its revenue in Greater China from manufacturing companies, and within that, electric cars form the largest category, said Ming Wong, vice president and CEO of Cisco Greater China.Chinese EV-makers have ramped up their global expans ...