Juniper JN0-664 Exam - Topic 4 Question 50 Discussion

Actual exam question for Juniper's JN0-664 exam

Question #: 50
Topic #: 4

By default, which statement is correct about OSPF summary LSAs?

AAll Type 2 and Type 7 LSAs will be summanzed into a single Type 5 LSA

BThe area-range command must be installed on all routers.

CType 3 LSAs are advertised for routes in Type 1 LSAs.

DThe metric associated with a summary route will be equal to the lowest metric associated with an individual contributing route

Show Suggested Answer

Suggested Answer: C

OSPF uses different types of LSAs to describe different aspects of the network topology. Type 1 LSAs are also known as router LSAs, and they describe the links and interfaces of a router within an area. Type 3 LSAs are also known as summary LSAs, and they describe routes to networks outside an area but within the same autonomous system (AS). By default, OSPF will summarize routes from Type 1 LSAs into Type 3 LSAs when advertising them across area boundaries .

by My at Jul 04, 2025, 01:12 PM

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Elvis

5 months ago

Totally agree, the area-range command is a must on all routers!

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Gretchen

5 months ago

I think it's actually Type 3 LSAs that are advertised for Type 1 routes.

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Erick

5 months ago

OSPF summary LSAs are pretty straightforward.

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Charolette

6 months ago

Wait, are you sure about that metric thing? Sounds off.

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Magdalene

6 months ago

Type 5 LSAs are for external routes, not summary ones.

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Dalene

6 months ago

I’m pretty sure the metric for summary routes is based on the lowest metric of the contributing routes, but I need to double-check that.

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Desire

6 months ago

I feel like Type 3 LSAs are involved with summarization, but I’m confused about how they relate to Type 1 LSAs in this context.

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Lili

7 months ago

I remember practicing a question about OSPF and the area-range command, but I can't recall if it needs to be on all routers or just the ABR.

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Malissa

7 months ago

I think summary LSAs are related to Type 5 LSAs, but I'm not sure if all Type 2 and Type 7 LSAs get summarized like that.

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Glenn

7 months ago

This looks like a good opportunity to apply my knowledge of OSPF. I'll carefully consider each option and think through the default summary LSA characteristics.

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Virgie

7 months ago

I'm a bit confused on the details of OSPF summary LSAs. I'll need to review my notes to make sure I understand the correct default behavior.

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Tasia

7 months ago

Okay, I know OSPF summary LSAs are used to aggregate routes. I think the key is understanding the default behavior for the metric and LSA types.

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Tamesha

7 months ago

Hmm, this seems like a tricky OSPF question. I'll need to think through the different LSA types and how summarization works.

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Dean

8 months ago

I'm pretty confident this is a question about OSPF summary LSAs. I'll need to remember the key details about how they work.

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Lizette

9 months ago

I don't know, guys. All these options sound kind of fishy to me. Maybe the real answer is that OSPF summary LSAs don't exist at all, and this is just a trick question to see who's paying attention.

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Delmy

8 months ago

B) The area-range command must be installed on all routers.

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Ronny

8 months ago

A) All Type 2 and Type 7 LSAs will be summarized into a single Type 5 LSA

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Martha

10 months ago

Personally, I think the correct answer is clearly D. The metric should be the lowest of the contributing routes. Anything else would just be plain illogical. Am I right, or am I right?

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Irene

10 months ago

Wait, wait, wait... are we sure this isn't a trick question? What if the answer is actually B, and the area-range command has to be installed on all routers? That sounds like something they'd do just to confuse us.

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Viva

8 months ago

No, I believe the correct answer is A, all Type 2 and Type 7 LSAs will be summarized into a single Type 5 LSA.

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Fatima

8 months ago

I think the answer is D, the metric associated with a summary route will be equal to the lowest metric associated with an individual contributing route.

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Tracey

10 months ago

Ha! All these options sound like they were written by someone who's never even seen an OSPF network. I'm going with D, just because it sounds the most logical.

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Natalya

10 months ago

Hmm, I'm not sure about that. I was thinking it might be C, where Type 3 LSAs are advertised for routes in Type 1 LSAs.

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Glennis

9 months ago

User 3: I agree with Leoma, D seems to be the correct statement about OSPF summary LSAs.

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Leoma

10 months ago

User 2: I'm not sure, but I believe it's A, all Type 2 and Type 7 LSAs will be summarized into a single Type 5 LSA.

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Fletcher

10 months ago

User 1: I think the correct statement is D, the metric associated with a summary route will be equal to the lowest metric associated with an individual contributing route.

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Caitlin

10 months ago

I think the correct answer is D. The metric associated with a summary route should be equal to the lowest metric of the individual contributing routes.

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