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Exam 300-410 topic 1 question 470 discussion

Actual exam question from Cisco's 300-410
Question #: 470
Topic #: 1
[All 300-410 Questions]

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 Hide Answer
Suggested Answer: D 🗳️
by GReddy2323 at May 29, 2023, 10:24 p.m.

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[Removed]
9 months, 4 weeks ago
Selected Answer: D
D is corerct
upvoted 1 times
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sayed_2908
1 year, 5 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, 1 month ago
yes it will, that's the point of floating static routes, this is a CCNA topic
upvoted 3 times
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aqwsdfghjklp
1 year, 5 months ago
I don't understand why B is incorrect.
upvoted 1 times
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inteldarvid
1 year, 10 months 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
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cir_
1 year, 11 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
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GReddy2323
1 year, 11 months ago
I don't understand the reasoning behind answer D. Could someone provide more details?
upvoted 1 times
HungarianDish_111
1 year, 11 months 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
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C (25%)
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