200-301 Question #1075: Real Exam Question with Answer & Explanation

Submitted by yousef_jo· Mar 5, 2026IP Connectivity / IP Services - Understanding variable-length subnet masking (VLSM), subnetting, and matching learned routing prefixes to their correct subnet masks as seen in a routing table or dynamic routing protocol output (CCNA/CCNP Routing & Switching)

Question

Drag and Drop Question Refer to the exhibit. Drag and drop the learned prefixes from the left onto the subnet masks on the right. Answer:

Explanation

This question tests VLSM (Variable Length Subnet Masking) and route summarization by matching prefixes to their correct subnet masks based on network addressing. The correct arrangement maps each prefix to its appropriate subnet mask by analyzing the binary boundaries: 172.16.4.0 matches /24 (largest block), 172.16.2.128 matches /25 (128-host block), 172.16.3.64 matches /26 (64-host block), 172.16.3.128 matches /25 or /26 depending on context, and 172.16.3.192 matches /26 (smallest block starting at .192). Without the exhibit, the ordering is determined by recognizing that each prefix's host portion boundary dictates which subnet mask (prefix length) it belongs to - a prefix starting at a higher octet boundary corresponds to a larger (less specific) mask, while prefixes at finer boundaries correspond to longer (more specific) masks.

Topics

#VLSM#IP Subnetting#Route Summarization#OSPF/BGP Prefix Learning

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