Arista Networks stock took another hit following comments from Nvidia's celebrity CEO.Shareholders of data center networking design and software provider Arista Networks (ANET 0.27%) got another helping of worry recently, this time delivered by none other than Nvidia (NVDA 0.81%).Arista manages a formidable little data center empire based on Ethernet networking technology, the same wired tech you're likely using to plug your PC into your internet modem. But in April, several Wall Street analysts downgraded ...