A que se refiere cuando dice “redes pequeñas”?

Y la sengunda que UTM por la misma linea del open source o software libre recomiendas para empresas mas grandes?

Extensible Threat Management (XTM)
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Extensible Threat Management (XTM) is the next generation of Unified Threat Management (UTM), integrated network security appliances.

As stated by IDC industry analyst Charles Kolodgy, in SC Magazine (May 2, 2008), Kolodgy reports,

“IDC believes that UTM will remain the primary security solution for distributed environments, but within the enterprise it will evolve into an eXtensible Threat Management (XTM) platform. XTM platforms will take security appliances beyond traditional boundaries by vastly expanding security features, networking capabilities and management flexibility. Future XTM appliances should provide automated processes – such as logging, reputation-based protections, event correlation, network access control and vulnerability management. Adding to the networking capabilities will be management of network bandwidth, traffic shaping, throughput, latency and other features, including unified communications.”

Products
* Astaro Corporation
* WatchGuard Technologies

saludos