Cisco CCNA 200-301 Practice Question

To configure a default route in IPv4 on a Cisco router, you use the command ip route 0.0.0.0 0.0.0.0 192.168.1.1. The 0.0.0.0 0.0.0.0 specifies a destination network of all zeros with a subnet mask of all zeros, which matches any IPv4 address not found in the routing table. This tells the router to forward packets destined for unknown networks to the next-hop IP address 192.168.1.1. The other options are incorrect because:

• ip route 0.0.0.0 255.255.255.255 192.168.1.1 defines a route to a specific host address 0.0.0.0, not a default route.
• ip default-gateway 192.168.1.1 is used on devices without IP routing enabled, such as switches, and is not appropriate when IP routing is active.
• ip route any any 192.168.1.1 is not a valid Cisco IOS command for configuring routes.