Exam 300-420 topic 1 question 272 discussion

Actual exam question from Cisco's 300-420

Question #: 272
Topic #: 1

Refer to the exhibit.

An architect is designing a Layer 3 campus network. The design must hide network instability, reduce network overhead, and conserve critical device memory. Which route summarization solution must the architect select?

A. • The aggregation layer must advertise a default route toward the core layer.
• The VLAN subnets must be summarized into 10.0.0.0/16 at the aggregation layer and advertised to the access layer.
B. • The core layer must advertise a default route toward the aggregation layer.
• The VLAN subnets must be summarized into 10.0.0.0/16 at the aggregation layer and advertised to the core layer.
C. • The aggregation layer must advertise a default route toward the access layer.
• The VLAN subnets must be summarized into 10.0.0.0/16 at the aggregation layer and advertised to the core layer.
D. • The core layer must advertise a default route toward the aggregation layer.
• The VLAN subnets must be summarized into 10.0.0.0/16 at the access layer and advertised to the aggregation layer.

Show Suggested Answer

Suggested Answer: B 🗳️

by TheGorn at Jan. 7, 2024, 10:55 p.m.

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muffedtrims

7 months, 3 weeks ago

Selected Answer: B

I agree with 08511d4, correct answer is B

upvoted 2 times

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08511d4

1 year ago

Selected Answer: B

I think its B. The default route should be towards the campus core (which presumably then connectes to other networks/internets). Summarisation should happen at the aggregation layer and its logical to present the core with a downstream summary. https://www.cisco.com/c/en/us/td/docs/solutions/Enterprise/Campus/routed-ex.html "As a design tip, unless the overall network design dictates otherwise, it is highly recommended that the network be configured with a default route (0.0.0.0) that is sourced into the core of the network, either by a group of highly available sink holes routers or by Internet DMZ routers."

upvoted 4 times

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