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Exam 300-101 topic 2 question 565 discussion

Actual exam question from Cisco's 300-101
Question #: 565
Topic #: 2
[All 300-101 Questions]

Refer to the exhibit.

ROUTE Enterprises has many stub networks in their enterprise network, such as router B and its associated network. EIGRP is to be implemented on router A so that neither the prefix for the S/0/0/0 interface nor the prefixes from router B appear in the routing tables for the router in the enterprise network. Which action will accomplish this goal?

  • A. Declare router B a stub router using the eigrp stub command.
  • B. Use the passive-interface command for interface Serial0/0/0.
  • C. Use a mask with the network command to exclude interface Serial0/0/0.
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Suggested Answer: D. Implement a distribute list to exclude the link prefix from the routing updates. 🗳️
Explanation -
If we declare router B a stub router then the routers in Enterprise Network still learn about the network for S0/0/0 interface and the network behind router B.
If we use the passive-interface command on s0/0/0 interface then router A & B can not become neighbor because they don`t exchange hello messages -> A can not send traffic to the network behind B .
Theoretically, we can use a distribute list to exclude both the link prefix and the prefix from router B but it is not efficient because:
+ We have many stub networks so we will need a long distribute list. + We declare networks in stub routers (like router B) while filter them out at router A -> it is a waste.
Not totally sure about answer C because if we use a mask with the network command to exclude interface Serial0/0/0 then router A and B can not become neighbors and the situation is same as answer B. But from many discussions about this question, maybe C is the best answer.
by diegonamaste at Feb. 20, 2020, 11:16 p.m.

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diegonamaste
5 years, 2 months ago
C. Use a mask with the network command to exclude interface Serial0/0/0.
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