From Anand Software and Training:
CertExams.com CCNA Network Simulator with Designer for CCNA includes 100+ labs on various topics like Access-Lists, Frame-Relay,IPv6, IPv6 Routing Protocols, DHCP, VLAN, VTP, STP etc for hands on practice. Network Simulator supports 300+ Cisco IOS commands to configure networks. It is possible to design your own network using the Design module. Several types of routers and switches are supported by the software.
The Essentials manual provides a thorough review of networking fundamentals, and multiple choice questions are provided at the end of each section. With the ability to configure and simulate several devices, the software provides real world experience for candidates desirous of learning hands-on networking skills. The download contains a demo simulator with limited functionality and labs which is just to try the software and full version requires activation key for unlocking the full version of the software. Please visit the product home page for more details.