Exam 300-101 topic 2 question 189 discussion

Actual exam question from Cisco's 300-101

Question #: 189
Topic #: 2

[All 300-101 Questions]

Which statement about a non-zero value for the load metric (k2) for EIGRP is true?

A. A change in the load on an interface will cause EIGRP to recalculate the routing metrics and send a corresponding update out to each of its neighbors.
B. EIGRP calculates interface load as a 5-minute exponentially weighted average that is updated every 5 minutes.
C. EIGRP considers the load of an interface only when sending an update for some other reason.
D. A change in the load on an interface will cause EIGRP to recalculate and update the administrative distance for all routes learned on that interface.

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Suggested Answer: C 🗳️

by Bastex at Sept. 5, 2019, 10:42 a.m.

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simlsc

5 years, 8 months ago

The load metric (k2) represents the worst load on a link between source and destination. EIGRP routing updates are triggered only by a change in network topology (like links, interfaces go up/down, router added/removed), and not by change in interface load or reliability -> A & D are not correct. The load is a five minute exponentially weighted average that is updated every five seconds (not five minutes) -> B is not correct. EIGRP considers the load of an interface only when sending an update for some other reason (like a link failure, topology change). Updates are not sent out each time the load changes -> C is correct.

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Bastex

5 years, 9 months ago

A “Note that Cisco recommends against using K-values K2, K4, and K5, because a nonzero value for these parameters causes the metric calculation to include interface load and reliability. The load and reliability change over time, which causes EIGRP to reflood topology data, and might cause routers to repeatedly choose different routes (route flapping).” Excerpt From: Kevin Wallace. “CCNP Routing and Switching ROUTE 300-101 Official Cert Guide”

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