Exam 300-410 topic 1 question 470 discussion

Actual exam question from Cisco's 300-410

Question #: 470
Topic #: 1

Refer to the exhibit.

Router R1 peers with two ISPs using static routes to get to the internet. The requirement is that R1 must prefer ISP-A under normal circumstances and failover to ISP-B if the connectivity to ISP-A is lost. The engineer observes that R1 is load balancing traffic across the two ISPs.

Which action resolves the issue by sending traffic to ISP-A only with failover to ISP-B?

A. Configure two static routes on R1, one pointing to ISP-B with more specific routes and another pointing to ISP-A with summary routes.
B. Configure OSPF between R1, ISP-A, and ISP-B for dynamic failover if any ISP link to R1 fails.
C. Change the bandwidth of the interface on R1 so that interface to ISP-A has a higher value than the interface to ISP-B.
D. Configure two static routes on R1, one pointing to ISP-A and another pointing to ISP- B with 222 admin distance.

Show Suggested Answer

Suggested Answer: D 🗳️

by GReddy2323 at May 29, 2023, 10:24 p.m.

Comments

Submit Cancel

sayed_2908

1 year, 8 months ago

something is missing in the question. we should have the option to track if the link is down then route will automatically failover. Adding two static route, even if the primary fails it won't get removed from the routing table will it?

upvoted 3 times

Gramterre

1 year, 4 months ago

yes it will, that's the point of floating static routes, this is a CCNA topic

upvoted 3 times

...

aqwsdfghjklp

1 year, 8 months ago

I don't understand why B is incorrect.

upvoted 1 times

...

inteldarvid

2 years ago

Selected Answer: D

Yes correct: option D, because route static float for example: ISP1) ip route 0.0.0.0 0.0.0.0 200.0.0.1 isp2) ip route 0.0.0.0 0.0.0.0 90.0.0.1 222 (AD static float)

upvoted 3 times

...

cir_

2 years, 2 months ago

D works if there is a layer 1 or 2 failure to ISP-A however I suspect there may be some details missing from this question

upvoted 1 times

...

GReddy2323

2 years, 2 months ago

I don't understand the reasoning behind answer D. Could someone provide more details?

upvoted 1 times

HungarianDish_111

2 years, 1 month ago

https://networklessons.com/cisco/ccna-routing-switching-icnd1-100-105/floating-static-route If we want to use a static route as a backup route, we’ll have to change its administrative distance. This is called a floating static route. https://www.geeksforgeeks.org/what-is-floating-static-route/ higher admin value to make a secondary route: Router(config)#ip route 192.168.60.0 255.255.255.0 192.168.40.2 (primary route) Router(config)#ip route 192.168.60.0 255.255.255.0 192.168.20.2 10 (secondary route)

upvoted 6 times

...