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By default, which statement is correct about OSPF summary LSAs?
Suggested Answer: C
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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 .
33 comments · newest first
EL
Elvis
10 months ago
Totally agree, the area-range command is a must on all routers!
GR
Gretchen
10 months ago
I think it's actually Type 3 LSAs that are advertised for Type 1 routes.
ER
Erick
10 months ago
OSPF summary LSAs are pretty straightforward.
CH
Charolette
11 months ago
Wait, are you sure about that metric thing? Sounds off.
MA
Magdalene
11 months ago
Type 5 LSAs are for external routes, not summary ones.
DA
Dalene
11 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.
DE
Desire
11 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.
LI
Lili
11 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.
MA
Malissa
12 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.
GL
Glenn
12 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.
VI
Virgie
12 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.
TA
Tasia
1 year 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.
TA
Tamesha
1 year ago
Hmm, this seems like a tricky OSPF question. I'll need to think through the different LSA types and how summarization works.
DE
Dean
1 year 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.
LI
Lizette
1 year 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.
DE
Delmy
1 year ago
B) The area-range command must be installed on all routers.
RO
Ronny
1 year ago
A) All Type 2 and Type 7 LSAs will be summarized into a single Type 5 LSA
MA
Martha
1 year 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?
IR
Irene
1 year 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.
VI
Viva
1 year 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.
FA
Fatima
1 year 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.
TR
Tracey
1 year 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.
NA
Natalya
1 year 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.
GL
Glennis
1 year ago
User 3: I agree with Leoma, D seems to be the correct statement about OSPF summary LSAs.
LE
Leoma
1 year 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.
FL
Fletcher
1 year 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.
CA
Caitlin
1 year 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.
VA
Valene
1 year ago
D) The metric associated with a summary route will be equal to the lowest metric associated with an individual contributing route
SK
Skye
1 year ago
A) All Type 2 and Type 7 LSAs will be summarized into a single Type 5 LSA
SH
Shad
1 year ago
Actually, I believe the correct answer is D because OSPF summary LSAs use the lowest metric of the contributing routes.
AL
Alysa
1 year ago
I'm not sure, but I think it might be A.
GI
Giuseppe
1 year ago
I agree with Danilo, the metric of the summary route is equal to the lowest metric of the contributing routes.
DA
Danilo
1 year ago
I think the answer is D.