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Exam 300-410 topic 1 question 7 discussion

Actual exam question from Cisco's 300-410
Question #: 7
Topic #: 1
[All 300-410 Questions]

Refer to the exhibit. An engineer is trying to generate a summary route in OSPF for network 10.0.0.0/8, but the summary route does not show up in the routing table.
Why is the summary route missing?

  • A. The summary-address command is used only for summarizing prefixes between areas.
  • B. The summary route is visible only in the OSPF database, not in the routing table.
  • C. There is no route for a subnet inside 10.0.0.0/8, so the summary route is not generated.
  • D. The summary route is not visible on this router, but it is visible on other OSPF routers in the same area.
Show Suggested Answer Hide Answer
Suggested Answer: C 🗳️
by [deleted] at July 30, 2021, 7:05 p.m.

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Malasxd
Highly Voted 2 years, 1 month ago
Selected Answer: C
the command "summary-address" is used to summary external routes (O E1/2) in ASBR. The command "redistribute static" in the question makes the router a ASBR. To summary inter area routes into ABRs you use "area x range" command. In both cases the summary route is advertised only if the RIB has a route that matches the summary prefix.
upvoted 10 times
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MasoudGhorbani
Most Recent 8 months, 3 weeks ago
C is correct. OSPF will only generate a summary route if there are specific subnets within the summary range that are active in the routing table since there are no routes within the 10.0.0.0/8 network in the routing table, OSPF has no more specific routes to summarize and therefore the summary route is not generated. The summary-address command is used on OSPF ASBR.
upvoted 4 times
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[Removed]
11 months ago
Selected Answer: C
C is correct
upvoted 2 times
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conft
1 year, 10 months ago
given answer is the correct.
upvoted 1 times
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Alexloh
2 years, 11 months ago
I have tested in lab, the summary-address only worked if you have the valid route on your routing table.
upvoted 3 times
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tefacert
3 years, 1 month ago
What about A? this is not an ABR, it only has area 0
upvoted 1 times
timtgh
3 years ago
This summary command is not for ABRs, it's for ASBRs, so Option A is wrong.
upvoted 2 times
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Jenia1
3 years, 4 months ago
Selected Answer: C
The given answer is correct
upvoted 1 times
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Stivostine
3 years, 6 months ago
Selected Answer: C
C is ok
upvoted 1 times
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error_909
3 years, 9 months ago
The given answer is correct
upvoted 1 times
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Community vote distribution
A (35%)
C (25%)
B (20%)
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