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Nokia 4A0-102 Exam - Topic 1 Question 33 Discussion

A BGP router has loopback interfaces 192.168.1.1/27 and 192.168.2.1/27 advertised into BGP using the following export policy. The "aggregate 192.168.0.0/16" command is executed. What is the effect of this configuration?
D) The given export policy is invalid.
A) A single route for 192.168.0.0/16 is advertised.
B) BGP routes 192.168.1.0/27, 192.168.2.0/27, and 192.168.0.0/16 are advertised.
C) BGP routes 192.168.1.0/27 and 192.168.2.0/27 are advertised, and 192.168.0.0/16 appears as a 'Blackhole' route in the route table only.

Nokia 4A0-102 Exam - Topic 1 Question 33 Discussion

Actual exam question for Nokia's 4A0-102 exam
Question #: 33
Topic #: 1
[All 4A0-102 Questions]

A BGP router has loopback interfaces 192.168.1.1/27 and 192.168.2.1/27 advertised into BGP using the following export policy. The "aggregate 192.168.0.0/16" command is executed. What is the effect of this configuration?

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Suggested Answer: D

by Chanel at Jan 04, 2023, 09:16 PM

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Virgina
8 months ago
The export policy looks valid to me.
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Shawn
9 months ago
BGP routes 192.168.1.0/27 and 192.168.2.0/27 are still there too.
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Dewitt
9 months ago
Wait, are you sure about that? I thought it might be a blackhole route.
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Art
9 months ago
Totally agree, that's how aggregation works!
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Jamal
9 months ago
A single route for 192.168.0.0/16 is advertised.
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Viva
9 months ago
I feel like the export policy is valid, but I’m not sure if it would show the aggregate as a blackhole route. I might go with option C just to be safe.
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Margot
9 months ago
I’m confused about whether the aggregate command would still allow the specific subnets to be advertised. Could it be option B instead?
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An
9 months ago
I remember practicing a similar question where the aggregate command was used, and it resulted in just one route being advertised. So, I’m leaning towards option A.
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Margo
10 months ago
I think the "aggregate" command should create a single route for 192.168.0.0/16, but I'm not entirely sure if it suppresses the more specific routes.
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Blondell
10 months ago
Hmm, the key here seems to be making sure all columns are included exactly once, even though the partitions have different schemas. I'll need to pay close attention to how the options handle that.
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Jeniffer
10 months ago
I'm not so sure, but I feel like the same-origin policy might come into play here. It usually relates to security issues rather than freezing the browser.
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Shawna
10 months ago
Okay, I think I've got this. The question is asking about the key principles that should guide sampling design, and the answer that covers all of those is option C - "All of the above." I'm feeling good about selecting that one.
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Tuyet
10 months ago
Flicker-free mode could potentially impact frame rates, but wasn't that only in specific scenarios?
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Chau
1 year ago
I think the key here is the 'aggregate 192.168.0.0/16' command. That's going to override the more specific loopback subnets and result in a single 192.168.0.0/16 route being advertised. Option A seems like the clear winner to me.
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Glory
1 year ago
Got it. Thanks for the clarification!
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Cecil
1 year ago
Exactly. The more specific 192.168.1.0/27 and 192.168.2.0/27 routes will be suppressed in favor of the aggregated route.
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Shalon
1 year ago
That makes sense. So, only the 192.168.0.0/16 route will be advertised, right?
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Cathrine
1 year ago
I agree, option A is the correct choice. The aggregate command will summarize the more specific routes into a single route.
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Jennie
1 year ago
Thanks for clarifying. Option A it is then, the aggregate command will advertise a single route for 192.168.0.0/16.
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Olga
1 year ago
No, option B is incorrect. The aggregate command will only advertise the summarized route, not the individual subnets.
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Darrel
1 year ago
But what about option B? Wouldn't that also include the more specific routes along with the aggregated route?
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Trevor
1 year ago
Yes, option A is the most logical answer here. The aggregate command will advertise the 192.168.0.0/16 route instead of the individual loopback interfaces.
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Jesusita
1 year ago
I agree, option A is the correct choice. The aggregate command will summarize the more specific routes into a single route.
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Madelyn
1 year ago
I agree, option A is the correct choice. The aggregate command will summarize the more specific routes into a single route.
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Alex
1 year ago
Haha, I bet the exam writer is trying to trick us with that 'Blackhole' route option. As if BGP would advertise a 'Blackhole' route, that's just silly!
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Filiberto
1 year ago
Wait, if the loopback interfaces are advertised, shouldn't the BGP routes for 192.168.1.0/27 and 192.168.2.0/27 also be advertised? I'm not sure about this one.
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Carin
1 year ago
The 'aggregate 192.168.0.0/16' command will definitely aggregate the two loopback subnets into a single route. So, the correct answer is A) A single route for 192.168.0.0/16 is advertised.
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Robt
1 year ago
Hmm, that makes sense too. Let's see what others think.
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Sylvie
1 year ago
I disagree, I believe the correct answer is B) BGP routes 192.168.1.0/27, 192.168.2.0/27, and 192.168.0.0/16 are advertised.
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Robt
1 year ago
I think the answer is A) A single route for 192.168.0.0/16 is advertised.
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