200-301: Cisco Certified Network AssociateDemo

Question

A router has learned three destination prefixes: 10.0.0.0/8, 10.0.0.0/16, and 10.0.0.0/24.

When the show ip route command is run, which output is returned?

A Gateway of last resort is 172.16.1.1 to network 0.0.0.0o E2 10.0.0.0/8 [110/5] via 192.168.1.1, 0:01:00, Ethernet0o E2 10.0.0.0/16[110/5] via 192.168.2.1, 0:01:00, Ethernet1o E2 10.0.0.0/24[110/5] via 192.168.3.1, 0:01:00, Ethernet2
B Gateway of last resort is 172.16.1.1 to network 0.0.0.0o E2 10.0.0.0/8 [110/5] via 192.168.1.1, 0:01:00, Ethernet0
C Gateway of last resort is 172.16.1.1 to network 0.0.0.0o E2 10.0.0.0/24[110/5] via 192.168.3.1, 0:01:00, Ethernet2
D Gateway of last resort is 172.16.1.1 to network 0.0.0.0o E2 10.0.0.0/16[110/5] via 192.168.2.1, 0:01:00, Ethernet1o E2 10.0.0.0/24[110/5] via 192.168.3.1, 0:01:00, Ethernet2

Explanation

A routing table stores separately learned routes for different network prefixes, including both less-specific and more-specific matches. The longest-prefix rule is used when choosing how to forward traffic for a particular destination, but show ip route displays all installed routes. Because /8, /16, and /24 are distinct prefixes, all three appear in the routing table output.

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200-301: Cisco Certified Network AssociateDemo

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