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The Cisco 1841 and Cisco 2801 Integrated Services Routers as part of Cisco's integrated services router portfolio offer secure data, voice and video connectivity (Note: Cisco 1841 supports data applications only) for small-to-medium-sized businesses and small enterprise branch offices. The routers support the Cisco IOS cross-platform images offering in the security images support for security features such as Network Admission Control (NAC) for anti-virus defense, Virtual Private Network (VPN) and inline intrusion protection. In addition, the Cisco 1841 and 2801 support encrypted VPN tunnels using Cisco IOS IPSec, and DES/3DES/AES encryption in hardware