Which IP prefix is used in a default route?

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Multiple Choice

Which IP prefix is used in a default route?

Explanation:
A router uses a catch‑all route to reach destinations it doesn’t have a specific path for, and this catch‑all is denoted by 0.0.0.0/0. The /0 means “all possible IPv4 addresses,” so this single prefix matches every destination and serves as the default path to the next hop when no more specific route exists. The other options don’t function as a default route: 255.255.255.0/24 is effectively a subnet designation, not a universal destination prefix; 192.168.0.0/16 is a private local network range; and 127.0.0.0/8 is the loopback range used to reach the device itself. Thus, 0.0.0.0/0 is the correct default route prefix.

A router uses a catch‑all route to reach destinations it doesn’t have a specific path for, and this catch‑all is denoted by 0.0.0.0/0. The /0 means “all possible IPv4 addresses,” so this single prefix matches every destination and serves as the default path to the next hop when no more specific route exists. The other options don’t function as a default route: 255.255.255.0/24 is effectively a subnet designation, not a universal destination prefix; 192.168.0.0/16 is a private local network range; and 127.0.0.0/8 is the loopback range used to reach the device itself. Thus, 0.0.0.0/0 is the correct default route prefix.

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