The Cisco 2921 Integrated Services Router (ISR) delivers highly secure data, voice, video, and application services for small offices. Key features include: - 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 - Security - Embedded hardware-accelerated VPN encryption - Secure collaborative communications with Group Encrypted Transport VPN, Dynamic Multipoint VPN, or Enhanced Easy VPN - Integrated threat control using Cisco IOS Firewall, Cisco IOS Zone-Based Firewall, Cisco IOS IPS, and Cisco IOS Content Filtering - Identity management: Intelligently protecting endpoints using authentication, authorization, and accounting (AAA), and public key infrastructure