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Juniper JN0-664 Exam - Topic 4 Question 50 Discussion

By default, which statement is correct about OSPF summary LSAs?
C) Type 3 LSAs are advertised for routes in Type 1 LSAs.
A) All Type 2 and Type 7 LSAs will be summanzed into a single Type 5 LSA
B) The area-range command must be installed on all routers.
D) The metric associated with a summary route will be equal to the lowest metric associated with an individual contributing route

Juniper JN0-664 Exam - Topic 4 Question 50 Discussion

Actual exam question for Juniper's JN0-664 exam
Question #: 50
Topic #: 4
[All JN0-664 Questions]

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

Show Suggested Answer Hide 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
7 months ago
Totally agree, the area-range command is a must on all routers!
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Gretchen
7 months ago
I think it's actually Type 3 LSAs that are advertised for Type 1 routes.
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Erick
7 months ago
OSPF summary LSAs are pretty straightforward.
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Charolette
7 months ago
Wait, are you sure about that metric thing? Sounds off.
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Magdalene
7 months ago
Type 5 LSAs are for external routes, not summary ones.
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Dalene
8 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
8 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
8 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
8 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
8 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
9 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
9 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
9 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
9 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
11 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
10 months ago
B) The area-range command must be installed on all routers.
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Ronny
10 months ago
A) All Type 2 and Type 7 LSAs will be summarized into a single Type 5 LSA
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Martha
11 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
11 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
10 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
10 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
11 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
11 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
11 months ago
User 3: I agree with Leoma, D seems to be the correct statement about OSPF summary LSAs.
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Leoma
11 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
11 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
12 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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Valene
11 months ago
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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Skye
11 months ago
A) All Type 2 and Type 7 LSAs will be summarized into a single Type 5 LSA
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Shad
12 months ago
Actually, I believe the correct answer is D because OSPF summary LSAs use the lowest metric of the contributing routes.
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Alysa
12 months ago
I'm not sure, but I think it might be A.
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Giuseppe
1 year ago
I agree with Danilo, the metric of the summary route is equal to the lowest metric of the contributing routes.
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Danilo
1 year ago
I think the answer is D.
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