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Cisco 300-510 Exam - Topic 5 Question 121 Discussion

Which difference must an engineer consider when choosing whether to implement OSPF or IS-IS as the routing protocol on the network?
B) To support fast convergence. OSPF uses the LSA arrival timer and IS-IS uses the PRC-interval timer.
A) The OSPF DR election process is deterministic, and the IS-IS DS election process is not deterministic.
C) IS-IS supports ordinary, stub, totally-stub. and NSSA areas, but OSPF supports only stub areas.
D) IS-IS links are associated with either a Level 1 area or a Level 2 area at one time, but OSPF links are associated with multiple areas at one time.

Cisco 300-510 Exam - Topic 5 Question 121 Discussion

Actual exam question for Cisco's 300-510 exam
Question #: 121
Topic #: 5
[All 300-510 Questions]

Which difference must an engineer consider when choosing whether to implement OSPF or IS-IS as the routing protocol on the network?

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Suggested Answer: B

by Vicente at Apr 01, 2026, 05:53 PM

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Iluminada
1 month ago
C is misleading. OSPF does support more area types than that.
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Kenia
2 months ago
I prefer B. Fast convergence is key for performance.
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Ashley
2 months ago
I think option A is crucial. OSPF's DR election is predictable.
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Kris
2 months ago
Not sure about that, I thought IS-IS was simpler overall.
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Terrilyn
2 months ago
I think OSPF has more flexibility with areas.
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Brice
2 months ago
Wait, IS-IS has more area types? That's surprising!
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Richelle
4 months ago
Totally agree, OSPF is more predictable!
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Eulah
4 months ago
OSPF DR election is deterministic, right?
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Bulah
5 months ago
I think IS-IS has a simpler area structure with Level 1 and Level 2, but I'm not clear on how that affects link association compared to OSPF.
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Linsey
5 months ago
I feel like the fast convergence part is important, but I get confused between the LSA arrival timer and the PRC-interval timer.
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Leandro
5 months ago
I practiced a question similar to this, and I recall that OSPF has different area types, but I can't remember if IS-IS has more options or not.
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Kimbery
5 months ago
I think I remember something about OSPF's deterministic DR election, but I'm not entirely sure how that compares to IS-IS.
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