200-301 Question #1384: Real Exam Question with Answer & Explanation

Question

Refer to the exhibit. A packet sourced from 10.10.10.1 is destined for 172.16.3.254. What is the subnet mask of the destination route?

Options

• A0.0.0.0
• B255.255.254.0
• C255.255.255.0
• D255.255.255.255

Explanation

Given the destination IP address 172.16.3.254, if the route covers a /23 network, the corresponding subnet mask is 255.255.254.0.

Common mistakes.

• A. 0.0.0.0 is the subnet mask for a default route, indicating any destination not specifically routed, and is not a specific subnet mask for a particular destination IP address.
• C. 255.255.255.0 is a /24 subnet mask, which would only cover the 172.16.3.0 network; while 172.16.3.254 is within this range, 255.255.254.0 is a broader or more specific route implied by the correct answer.
• D. 255.255.255.255 is a /32 subnet mask, which represents a host-specific route matching only a single IP address, rather than a network route for a range of addresses.

Concept tested. Subnet mask identification for IP routes

Reference. null

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