As Cedric has told you can use GNS3, Or you can use online rack rental solution.like this:CCIE Collaboration Lab Bootcamps, CCIE Collaboration Lab Workbooks, CCIE Collaboration Rack Rental, CCIE Security Lab Bo…Best RegardsMojtaba

The 3850 uses Store-and-Forward switching method. You couldn't change the method in 3850.You can change switching method in switches that use cut-through switching like Nexus 5000 series with below command in global configuration mode.hardware ethern...