350-401 Question #82: Real Exam Question with Answer & Explanation

Question

Which EIGRP feature allows the use of leak maps?

Options

• Aoffset-list
• Bneighbor
• Caddress-family
• Dstub

Explanation

EIGRP Stub and Leak Maps

D (stub) is correct because the EIGRP stub feature uses leak maps to selectively advertise specific routes that would otherwise be suppressed by the stub configuration. A stub router normally limits the routes it advertises (e.g., connected, summary), but a leak map - a route map tied to the stub command - allows certain prefixes to "leak" through and be advertised as exceptions to the stub restrictions.

Option A (offset-list) is wrong because offset-lists are used to adjust EIGRP metric values (delay or bandwidth), not to control route advertisement exceptions. Option B (neighbor) defines static EIGRP neighbors for unicast peering and has no relationship to leak maps. Option C (address-family) is a configuration container used in EIGRP named mode to organize routing configuration by address type, but it is not the feature that enables leak maps - the stub command within the address-family does that.

🧠 Memory Tip: Think of "stub + leak map" as a dam with a controlled release valve - the stub blocks most route advertisements, and the leak map is the valve that lets specific routes flow through. "Stubborn routes need a leak to escape!"

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