arista networks stock is sharply higher in late trading monday after the networkinghardware company posted betterthanexpected fourthquarter financial results also firstquarter guidance exceeded previous street estimates arista gets a substantial portion of its business from public cloud providers and the strong results bodes well for rivals in the sector like cisco systems and ciena for the quarter arista ticker anet posted revenue of 8245 million up 271 from a year 101 above the third quarter level