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The command "R2(config)#ip route 0.0.0.0 0.0.0.0 10.1.2.1" is issued on router R2. What is true about the result?
Packets destined to an unknown destination will be sent through 10.1.2.1.
Packets destined to the network connected to 10.1.2.1 are discarded.
If a packet is destined to IP address 10.1.2.1, the router will discard the packet.
Only packets destined to network 0.0.0.0/0 are forwarded to 10.1.2.1
A default route is used to forward packets destined to any unknown destination to a single next hop address. The command to configure a default route is the same as a static route, but the network address and mask set to 0.0.0.0. If router R2 doesnt have information about a remote network, then it will send it towards next hop 10.1.2.1. For more information refer to: [http://www.freeccnastudyguide.com/study-guides/ccna/ch4/routing/]
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