Supervisor Engines I features switching engine that provides data path and control for all network interfaces including two integrated Fast Ethernet interfaces that can support redundancy using the spanning tree algorithm or load sharing when used with VLANs; and fast Ethernet interfaces using RJ-45 media-dependent interface crossed-over (MDIX) and media-independent interface (MII) connectors, Fast Ethernet multimode fiber (MMF), or single-mode fiber (SMF) interfaces using SC connectors.It also provides management functions that include monitoring the interface and environmental status and providing Simple Network Management Protocol (SNMP) management and the console/Telnet interface.