Cisco Packet Tracer is a powerful network simulator that can be utilized in training for CCNA TM and CCNP TM certification exam by allowing students to create networks with an almost unlimited number of devices and to experience troubleshooting without having to buy real CiscoTM routers or switches.
Cisco Packet Tracer features an array of simulated Application layer protocols (HTTP, DNS, …), as well as basic routing with RIP, OSPF, and EIGRP, to the extent required by the current CCNA TM curriculum. It also includes Cisco IOS 15 with licence features which was introduced in the CCNA exam in 2013.
Cisco Packet Tracer 7.1 was released in August 2017 with quite a lot of new devices and features, including for the first time emulated Cisco wireless capabilities with WLC and lightweight access point. New firewalling capabilities are also included with the Security Plus ASA licence. Check the new features of Packet Tracer 7.1 and the bug correction list.