![]() ![]() The Network layer provides the means for transferring data from one node to another. Network devices that operate up to layer two are switches and bridges This is where the MAC (Media Access Control) address resides. ![]() The Data link layer is the lowest level where communication occurs. Network devices that operate only at layer one are hubs and repeaters. The Physical layer pertains to the actual connectivity medium and device such as the physical cables and network cards. So lets first recap on some basic networking theory.Īlmost all network theory and understanding references the OSI model (Open Systems Interconnection.) The OSI model defines 7 logical layers, each addressing more complex functionality and each layer supporting the one above it. ![]() The differences between Sophos UTM’s operational modes are best understood if you understand where they differ from an OSI layer perspective. In this article we’ll investigate how they work to help you decide which mode(s) to use for your network. Sophos UTM can be configured to act in different operation modes, each with its own potential advantages and drawbacks.
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