200-301: Cisco Certified Network AssociateDemo

Question

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Refer to the exhibit. A packet with source 10.10.10.1 is being sent to 172.16.3.254. What is the subnet mask of the destination route?

A 0.0.0.0
B 255.255.254.0
C 255.255.255.0
D 255.255.255.255

Explanation

A /23 subnet mask is expressed in dotted-decimal notation as 255.255.254.0. The destination address 172.16.3.254 falls within the connected route 172.16.2.0/23, which spans from 172.16.2.0 through 172.16.3.255. Therefore, the destination route uses the /23 mask, which corresponds to 255.255.254.0.

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show ip route Command Reference – Cisco

200-301: Cisco Certified Network AssociateDemo

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