What's the difference between Cisco 2921 router with Cisco 2911 router ?
The Cisco 2921 Integrated Services Router (ISR) Features:
3 Integrated 10/100/1000 Ethernet ports with 1 port capable of RJ-45 or SFP connectivity
1 service module slot
4 Enhanced High-Speed WAN Interface Card (EHWIC) slots
3 onboard digital signal processor slots
1 internal service module slot for application services
Fully integrated power distribution to modules supporting 802.3af Power over Ethernet (PoE) and Cisco Enhanced PoE
The Cisco 2911 Integrated Services Router (ISR) Features:
3 integrated 10/100/1000 Ethernet ports (RJ-45 only)
1 service module slot
4 enhanced high-speed WAN interface card slots
2 onboard digital signal processor (DSP) slots
1 Internal Service Module slot for application services
Fully integrated power distribution to modules supporting 802.3af Power over Ethernet (PoE) and Cisco Enhanced PoE
The Cisco 2921 Integrated Services Router (ISR) Features:
3 Integrated 10/100/1000 Ethernet ports with 1 port capable of RJ-45 or SFP connectivity
1 service module slot
4 Enhanced High-Speed WAN Interface Card (EHWIC) slots
3 onboard digital signal processor slots
1 internal service module slot for application services
Fully integrated power distribution to modules supporting 802.3af Power over Ethernet (PoE) and Cisco Enhanced PoE
The Cisco 2911 Integrated Services Router (ISR) Features:
3 integrated 10/100/1000 Ethernet ports (RJ-45 only)
1 service module slot
4 enhanced high-speed WAN interface card slots
2 onboard digital signal processor (DSP) slots
1 Internal Service Module slot for application services
Fully integrated power distribution to modules supporting 802.3af Power over Ethernet (PoE) and Cisco Enhanced PoE