Typically implies it is a multilayer switch image, capable of Layer 2 and Layer 3 functionality.
Specifies the IOS version: 15.4(1)T . The 'T' stands for Technology Train , which brings new features and capabilities. i86bi-linux-adventerprisek9-ms.154-1.t-antigns3.bin
Enhanced support for BGP, EIGRP, OSPF, and RIPng. Typically implies it is a multilayer switch image,