ASA 8.3 and Later: Mail (SMTP) Server Access on Inside Network Configuration Example - Cisco
Cisco 1800 Series Integrated Services Routers (Fixed) Software Configuration Guide - Configuring a LAN with DHCP and VLANs [Cisco 1800 Series Integrated Services Routers] - Cisco
Cisco Router as Terminal Server configuration - The Network DNA
Cisco 850 Series and Cisco 870 Series Access Routers Hardware Installation Guide - Router Cabling Procedures [Cisco 800 Series Routers] - Cisco Systems