(April 8, 2013 Cisco Network Technology Academy officially released the official version! No time limit and usage restrictions, etc.! Corrected many bugs in the 6.0 beta version! This is Cisco's latest PT6.0 simulator. The previous version 5.5 and 5.3 could only do NA experiments. Now this can do NP experiments, and the IOS inside has also been upgraded. The latest PT can do some NP experiments. Cisco has updated the Cisco PacketTracer, a common simulator for learning, and the latest version is already 6.0. Cisco has added several new routers, and IOS has supported it up to 15.1. The switch is still 12.2,,, 3560, this is a bit of a problem, can't be cut into 3-layer ports.. New bright spot: Cisco saves a lot of commonly used topologies in save, which are worth studying.)