Trefis submits: Trefis analysis for Cisco (CSCO). Click to see full analysis. Cisco competes with Juniper (NYSE:JNPR) in the router business and has the leading market share in all three categories of routers (enterprise, core, edge). Cisco sells routers primarily to large businesses and internet service providers that use them to manage the flow of data (such as emails) throughout their networks or through the internet.Complete Story »