(Ciscopackettracer5.3.3.0019 is much better than version 5.3.0088. Those who test network engineers can use this version to contact with the textbook. The ipdomain name command in the old version 5.3.0088 does not exist at all. This version has it, which is enough for practicing the content on the textbook of network engineers! I've been looking for this version for a long time. By the way, I'll provide you with "a Cisco simulation routesim" with exercise content. You can have a look. This ciscopackettracer5.3.3.0019 Chinese description is marked as incomplete Chinese. In fact, as long as the main operation is Chinese, it is much more convenient. There are enough network engineers to deal with the soft exam!)