300-410 Practice Question: The default administrative distance for a route…

Answer analysis

Option-by-option breakdown

For each option: why learners choose it and why it is or isn't the right answer here.

• ✗

  90

  Why it's wrong here

  Distance 90 applies to EIGRP internal routes learned within the same autonomous system, not to the summary route itself. EIGRP summary routes carry administrative distance 5, making them preferred over internal routes. Distance 90 is correct for ordinary internal EIGRP entries.

• ✗

  170

  Why it's wrong here

  Distance 170 is assigned to external EIGRP routes redistributed from another routing domain, not to summary routes. EIGRP summary routes use administrative distance 5. Distance 170 applies when an EIGRP route originates outside the autonomous system.

• ✓

  5

  Why this is correct

  EIGRP assigns administrative distance 5 to summary routes, distinguishing them from internal routes (90) and external routes (170). This low value ensures the summary is trusted over other sources, reflecting its origin as a locally configured aggregate rather than a learned path.

• ✗

  1

  Why it's wrong here

  Administrative distance 1 belongs to static routes, not EIGRP. EIGRP internal routes use 90 and summary routes use 5, so 1 would incorrectly outrank every dynamic protocol. Static routing is the scenario where distance 1 applies.

Go deeper

Related to this question