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Exam 200-301 topic 1 question 366 discussion

Actual exam question from Cisco's 200-301
Question #: 366
Topic #: 1
[All 200-301 Questions]


Refer to the exhibit. An engineer is bringing up a new circuit to the MPLS provider on the Gi0/1 interface of Router 1. The new circuit uses eBGP and learns the route to VLAN25 from the BGP path.
What is the expected behavior for the traffic flow for route 10.10.13.0/25?

  • A. Traffic to 10.10.13.0/25 is load balanced out of multiple interfaces.
  • B. Traffic to 10.10.13.0/25 is asymmetrical.
  • C. Route 10.10.13.0/25 is updated in the routing table as being learned from interface Gi0/1.
  • D. Route 10.10.13.0/25 learned via the Gi0/0 interface remains in the routing table.
Show Suggested Answer Hide Answer
Suggested Answer: C 🗳️
by cdp_neighbor at Jan. 8, 2021, 10:29 a.m.

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cybernett
Highly Voted 3 years, 11 months ago
The correct answer is D Because when new route is learned by R1 it will be added to it's routing table via Gi0/1 But the previous still stays in the routing table which is learned via Gi0/0 (ospf) Hence we have two paths to reach 10.10.13.0/25 Cisco plays with words, read carefully. C is wrong because they used the word updated and not added. Updated means previous route is removed Which is not true , it stays in the table Hence D is perfect answer
upvoted 71 times
Secsoft
1 year, 5 months ago
The router will never allow multiple routing protocols to the same destination in its table. The correct answer is C.
upvoted 2 times
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bootloader_jack
3 years ago
I know that only the route with better administrative distance is installed in routing table. So, the ospf route will be replaced by ebgp route. Am I wrong?
upvoted 3 times
jahinchains
2 years, 9 months ago
10.10.13.0/25 is a different subnet ospf will stay on the routing table
upvoted 1 times
DixieNormus
2 years, 4 months ago
How is 10.10.13.0/25 a different subnet from 10.10.13.0/25?
upvoted 10 times
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BreezyNet
2 years, 1 month ago
this is true, experienced this in real life as I was configured two paths to a branch via 2 different ISP's, both routes where learned and kept in the routing table
upvoted 3 times
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gaber
3 years, 1 month ago
the question seems to be whether the route will be replaced by the new one. Does it delete the ospf route? I don't know. but I imagine not. So I'd probably go with D.
upvoted 2 times
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cdp_neighbor
Highly Voted 4 years ago
"The AD of eBGP (20) is smaller than that of OSPF (110) so the route to 10.10.13.0/25 will be updated as being learned from the new BGP path." - which means that C is the correct answer?
upvoted 34 times
raul_kapone
1 year, 5 months ago
Yes man. When the router learn different routes from different sources (protocols), the Lowes Administrative Distance of each protocol says what route would be added to the routing table. Like you said: AD of eBGP = 20 (Lowest) AD of OSPF = 110
upvoted 2 times
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sinear
4 years ago
I think so too, though we find several answers to this in other sites. The comment below the question seems to point to C rather than D.
upvoted 6 times
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picho707
Most Recent 1 year, 2 months ago
Selected Answer: C
The answer is C because the router learns the routes from BGP. In addition, AS 1000 will have preference over AS 3000.
upvoted 2 times
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josop
1 year, 3 months ago
What the heck is a new circuit? I didn't even understand the question. Can anyone help?
upvoted 1 times
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fmaquino
1 year, 7 months ago
Selected Answer: C
C (AD is 20)
upvoted 2 times
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gc999
1 year, 10 months ago
I see the official answer here is "D", but it uses the explanation in "C". That is "so the route to 10.10.13.0/25 will be updated as being learned from the new BGP path".
upvoted 1 times
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remoto
2 years, 1 month ago
Selected Answer: D
The correct answer is "D" The keys is "learned"
upvoted 3 times
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arenjenkins
2 years, 3 months ago
beyond CCNA
upvoted 13 times
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clivebarker86
2 years, 3 months ago
i just tried with PT, configured OSPF + RIP, only OSPF is added to the table, with #no router ospf command, RIP added to the table, correct answer C
upvoted 2 times
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Murphy2022
2 years, 4 months ago
There is no Gi0/0 Interface so C must be correct.
upvoted 1 times
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PiotrMar
2 years, 4 months ago
Selected Answer: C
it is C
upvoted 1 times
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ZUMY
2 years, 5 months ago
Going with C:
upvoted 2 times
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TA77
2 years, 7 months ago
The explaination doesn't match the selected answer. I guess the answer D was selected by mistake instead of C.
upvoted 2 times
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DARKK
2 years, 8 months ago
Selected Answer: C
An OSPF(110 AD) path for VLAN 25 (10.10.13.0 /25) exits via Gi0/0, However an eBGP (20 AD) Path is being added via Gi0/1. Answer is C. Read the question carefully, and look at the image given. The eBGP path via Gi0/1 is chosen because it has a lower AD.
upvoted 3 times
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ar2
2 years, 8 months ago
C. I've just watched CBT Nuggets BGP overview, he does a demo almost identical. ie same network/mask with BGP and OSPF. The OSPF route is replaced.
upvoted 5 times
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SOAPGUY
2 years, 8 months ago
Selected Answer: C
C; https://www.cisco.com/c/en/us/support/docs/ip/border-gateway-protocol-bgp/15986-admin-distance.html
upvoted 2 times
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Nalle72
2 years, 10 months ago
D is correct. The routes OSPF learns are subnetted with longer prefixes (/28,/29, /30), but eBGP learns a route to 10.10.13.0/25. Thus, the OSPF routes need to remain. As the OSPF routes with longer prefixes do not cover the whole /25 subnet, BGP route would be added to the routing table as well.
upvoted 1 times
i_am_confused
2 years, 7 months ago
The question asks specifically about the 10.10.13.0/25 network. The more specific networks can be ignored since those are separate networks not relevant to the question. There will be two routes to 10.10.13.0/25, one through eBGP and one through OSPF. The eBGP route will be installed into the routing table and replace the OSPF route since eBGP has lower AD than OSPF. I believe the answer is C.
upvoted 4 times
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