Refer to the exhibit. In addition to static routes directing traffic to networks 10.10.0.0/16 and 10.20.0.0/16, Router HQ is also configured with the following command:
ip route 0.0.0.0 0.0.0.0 serial 0/1/1
What is the purpose of this command?
- Packets that are received from the Internet will be forwarded to one of the LANs connected to R1 or R2.
- Packets with a destination network that is not 10.10.0.0/16 or is not 10.20.0.0/16 or is not a directly connected network will be forwarded to the Internet.
- Packets from the 10.10.0.0/16 network will be forwarded to network 10.20.0.0/16, and packets from the 10.20.0.0/16 network will be forwarded to network 10.10.0.0/16.
- Packets that are destined for networks that are not in the routing table of HQ will be dropped.
Explanation: The command ip route 0.0.0.0 0.0.0.0 serial 0/1/1 configures a default static route, also known as a quad-zero route, which serves as a gateway of last resort by matching all packets that do not have a more specific entry in the routing table, ensuring that traffic destined for unknown remote networks like the Internet is forwarded out the specified serial interface instead of being dropped.
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