Hello everyonei am using Packet tracer 6.0.1.0011. the problem wh i am facing is when i try to execute command "no ip routing" command on router it gives invalid command. router model available are 2911, 2901, 2811, 2621XM. router accept the command "ip route" but not "no ip routing"Also when i try to execute "ip default-gateway" command router refuses to accept it and gives invalid command errori tried this on GNS3 there it works fine. problem with GNS3 is that it doesnt have switchesshow version command on router 2911 gives "Cisco IOS Software, C2900 Software (C2900-UNIVERSALK9-M), Version 15.1(4)M4, "is there anything wrong with Packet Tracer or any other mistake???