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When you have routing enabled then you need default route (also called

default network or Gateway of Last Resort). You do not need default route

if you don't use routing. For example if you just have one router in your network there is no need for default route. When you have more than one router in a network you need default route.

Note: If you connect to WAN (internet) you need default route. The default route allows connection with Internet. If you are not using WAN and have one router than there is not need for default route but in these days everyone connects to the Internet so most likely your router has default route. When using router to connect to the Internet using DHCP this happens automatically so there will no need to configure default route manually. If you need to manually set default route then use the commands IP default-network or IP route 0.0.0.0 0.0.0.0 .

More info can be found at Cisco's site - see the related link below.

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