CISCO2911-IB/K9---------Cisco 2911 with 3 onboard GE, 4 EHWIC slots, 2 DSP slots, 1 ISM slot, 256MB CF default, 512MB DRAM default, IP Business
CISCO2911-SEC/K9---------Cisco 2911 Security Bundle w/ SEC license PAK
CISCO2911-V/K9----------Cisco 2911 Voice Bundle, PVDM3-16, UC License PAK, FL-CUBE10
CISCO2911-HSEC/K9-------HSEC bundle (no ISM VPN module) for 2911 ISR platform
本质上没有区别,只是下单包含的license不同.