Nokia Exam 4A0-102 Topic 1 Question 33 Discussion

Actual exam question for Nokia's 4A0-102 exam

Question #: 33
Topic #: 1

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?

AA single route for 192.168.0.0/16 is advertised.

BBGP routes 192.168.1.0/27, 192.168.2.0/27, and 192.168.0.0/16 are advertised.

CBGP 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.

DThe given export policy is invalid.

Show Suggested Answer

Suggested Answer: D

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

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Chau

2 days 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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Alex

3 days 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

6 days 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

8 days 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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