Exam 300-410 topic 1 question 436 discussion

Actual exam question from Cisco's 300-410

Question #: 436
Topic #: 1

The summary route is not shown in the Router_B routing table after this below configuration on Router_A:

interface ethernet 0
description location ID:S4318T3E77F02
ip address 192.168.3.1 255.255.255.0
ip summary-address eigrp 1 172.16.80.0 255.255.240.0

Which Router_A configuration resolves the issue by advertising the summary route to Router_B?

A. interface loopback 0
ip address 172.18.81.1 255.255.255.0
interface Ethernet 0
ip address 192.168.3.1 255.255.255.0
ip summary-address eigrp 1 172.16.80.0 255.255.240.0
B. interface loopback 0
ip address 172.16.79.1 255.255.255.0
interface Ethernet 0
ip address 192.168.3.1 255.255.255.0
ip summary-address eigrp 1 172.16.80.0 255.255.240.0
C. interface loopback 0
ip address 172.16.81.1 255.255.255.0
interface Ethernet 0
ip address 192.168.3.1 255.255.255.0
ip summary-address eigrp 1 172.16.80.0 255.255.240.0
D. interface loopback 0
ip address 172.16.96.1 255.255.255.0
interface Ethernet 0
ip address 192.168.3.1 255.255.255.0
ip summary-address eigrp 1 172.16.80.0 255.255.240.0

Show Suggested Answer

Suggested Answer: C 🗳️

by GReddy2323 at Feb. 8, 2023, 5:32 a.m.

Comments

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Titini

Highly Voted 2 years, 3 months ago

We need to add a loopback interface that belongs to the subnet 172.16.80.0 255.255.240.0

upvoted 6 times

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NazgulNr5

Most Recent 6 months, 1 week ago

Selected Answer: C

A subnetting question. How cute!

upvoted 3 times

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[Removed]

10 months, 2 weeks ago

Selected Answer: C

C is correct

upvoted 1 times

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[Removed]

1 year, 6 months ago

Selected Answer: C

Will only advertise a summary if there is valid address within it in the RIB. C is the only address in the summary range.

upvoted 3 times

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inteldarvid

1 year, 10 months ago

Selected Answer: C

correct

upvoted 2 times

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GReddy2323

2 years, 3 months ago

I don't understand this question, can someone please explain?

upvoted 1 times

targetA

2 years, 3 months ago

Summary addresses won't show in the routing table unless there's a componant route in the summary address range Another way of asking this question would be "which of the following loopback ip addresses are contained in the 172.16.80.0 255.255.240.0 summary address" A - 172.18.81.1 - is not in the summary as it has to be 172.16.80.0 - 172.16.95.255 B - 172.16.79.1 - is just under the summary D - 172.16.96.1 - is just over the summary Only C is in that range, which triggers the summary address to go into the routing table

upvoted 13 times

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