CCNA: Cisco Certified Network Associate — Question 789

A router received 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 executed, which output does it return?

Answer options

• A. Gateway of last resort is 172.16.1.1 to network 0.0.0.0 o E2 10.0.0.0/8 [110/5] via 192.168.1.1, 0:01:00, Ethernet0 o E2 10.0.0.0/16[110/5] via 192.168.2.1, 0:01:00, Ethernet1 o 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 0.0.0.0 o 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 0.0.0.0 o 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 0.0.0.0 o E2 10.0.0.0/16[110/5] via 192.168.2.1, 0:01:00, Ethernet1 o E2 10.0.0.0/24[110/5] via 192.168.3.1, 0:01:00, Ethernet2

Correct answer: A

Explanation

The correct answer is A because it includes all three prefixes listed in the routing table, showing that the router is aware of multiple routes to the same destination. Options B, C, and D are incorrect as they only show one or two prefixes instead of all three, which is necessary to reflect the full routing information for the 10.0.0.0 network.