mz stands for “run-from-Memory, Zipped”. The image is compressed to save flash space and is decompressed into RAM during boot. This is the standard for Catalyst switches.
The filename follows Cisco’s standard naming convention, providing a roadmap of the software’s capabilities: : Identifies the hardware platform (Catalyst 3560). C3560-ipservicesk9-mz.150-2.se11.bin
: This describes the feature set. "IP Services" is a high-level software package that includes full Layer 3 routing capabilities (like BGP, EIGRP, and OSPF) and advanced Quality of Service (QoS). The "k9" indicates it includes strong 3DES/AES encryption for secure management. mz stands for “run-from-Memory, Zipped”