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Exam 350-501 topic 1 question 274 discussion

Actual exam question from Cisco's 350-501

Question #: 274
Topic #: 1

Refer to the exhibit. The USER that is connecting an application on an Internet connection in AS 100 is facing these issues:
✑ The USER lost the connection to the application during a failure between IG and R2.
✑ Router R2 configuration is lost due to a power outage.
✑ The application the USER is connecting to is hosted behind CE2.
What action resolves the issues on R3 and R4 routers?

A. Apply low Local Preference on R4 toward R2.
B. Apply high Local Preference on R3 toward R1.
C. Set R4 as a route reflector for R3 and CE2.
D. Set R3 as a route reflector for R4 and CE1.

Show Suggested Answer

Suggested Answer: C 🗳️

by waldo33 at Oct. 7, 2022, 1:05 p.m.

Comments

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Hans3000

1 year ago

Selected Answer: C

Its C, see comment from 12_sdeEQ. Thanks!

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12_sdeEQ

1 year, 2 months ago

Selected Answer: C

for me the Correct answer is C : if R2 is down, user prefixes are advertised from IG to R1, then R1 to R3 , then R3 to R4 ( from EBGP to IBGP), then since R4 is RR to CE2 it advertise the prefixe to CE2, from other way(prefixe of appli behind CE2), CE2 advertise to R4(IBGP), then R4 advertise to R3(since RR), then R3 to R1 (from ibgp to ebgp), R1 to IG.

upvoted 3 times

12_sdeEQ

1 year, 2 months ago

to proof that D is incorrect : if R2 is down: user prefixe send from IG to R1, then R1 to R3 , then R3 to R4(since R3 is RR), then ? how R4 can adverise prefixe recieved from R3 to CE2 ? it can not since bgp rules denies that(from ibgp to ibgp )

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Totalstranger

1 year, 3 months ago

Selected Answer: D

Its D, If R2 is down, all prefixes will come from R1 then will be advertise to R3, With R3 not being RR, it wont be able to advertise R1 prefixes to R4 where R2 is connected the the hosts

upvoted 1 times

Totalstranger

1 year, 2 months ago

I'm wrong, this is C

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thejag

1 year, 5 months ago

Did anyone notice the configuration on R3 is wrong? It has a neighbor to AS 400 using the IP from router R1 in AS 200. It should peer with AS 200 not AS 400. I go for C also.

upvoted 3 times

Totalstranger

1 year, 3 months ago

Its D, If R2 is down, all prefixes will come from R1 then will be advertise to R3, With R3 not being RR, it wont be able to advertise R1 prefixes to R4 where R2 is connected the the hosts

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mohdema

1 year, 8 months ago

Initially I didn't read the question well and I instintivly thought local preference, however the two local preference suggestions are equivalent... So after reading the comments and thinking it through... The solution would be to use R4 as a RR beteween R3 and CE2 Nothing in the question suggets CE2 and CE3 provide the same services... And if R4 acts as RR, then CE2 will be reachable from the internet as a session would be established between it and PE3

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ccie_race

1 year, 8 months ago

Option C is correct R4 becomes RR and can exchange traffic between R3 and CR2.

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kakalman

1 year, 9 months ago

The solution would be to correct the remote-as on R3 towards R1 first ... (but it's not a possible answer..)

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waldo33

1 year, 9 months ago

how does the Route-reflector solve this? and not adjusting local prefference?

upvoted 1 times

txapnia

1 year, 8 months ago

BGP prefixes received via on R3 VIA EBGP. R3 send this prefixes to R4 , but R4 not forward BGP prefixes to CR2 BGP Rules FROM IBGP peer received prefixes not forward to IBGP peer

upvoted 2 times

ccie_race

1 year, 8 months ago

BGP prefixes received via on R3 VIA EBGP. R3(RR-client) send this prefixes to R4 , R4(RR) forwards this to CR2(RR-client). https://networklessons.com/bgp/bgp-route-reflector

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ARTU_IT

1 year, 8 months ago

Local preference can´t be used for ebgp.

upvoted 2 times

chst

1 year, 5 months ago

it's correct local preference don't work in ebgp So, i thinks is D, because the client lost the connection when R2 has a outage Set R3 as a route reflector for R4 and CE1.

upvoted 2 times

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