Under what circumstances would you disable auto-summary and enable subnet-specific updates in RIP?

• A. On simple, contiguous networks with no subnetting.
• B. When you want to reduce routing table size in large networks.
• C. On discontiguous networks or where precise subnet information is required.
• D. When using only primary classful networks.

Answer: (C)

The mechanism being tested is how RIP handles subnet information in updates. Auto-summarization lets RIP advertise only the classful network, discarding the exact subnet masks, which can blur where subnets actually reside. When you disable auto-summary and rely on subnet-specific updates, each route is advertised with its precise subnet mask. This is essential when the network has subnets spread across different areas or when you need exact subnet information to route correctly—i.e., discontiguous networks or situations requiring precise subnet details. In such cases, preserving the subnet information avoids misrouting that could occur if routes were summarized to the classful boundary. Therefore, the circumstance described—discontiguous networks or where precise subnet information is required—is when you would disable auto-summary and enable subnet-specific updates.