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Exam 200-301 topic 1 question 491 discussion

Actual exam question from Cisco's 200-301
Question #: 491
Topic #: 1
[All 200-301 Questions]


Refer to the exhibit. Traffic from R1 to the 10.10.2.0/24 subnet uses 192.168.1.2 as its next hop. A network engineer wants to update the R1 configuration so that traffic with destination 10.10 2.1 passes through router R3, and all other traffic to the 10.10.2.0/24 subnet passes through R2. Which command must be used?

  • A. ip route 10.10.2.1 255.255.255.255 192.168.1.4115
  • B. ip route 10.10.2.0 255.255.255.0 192.168.1.4115
  • C. ip route 10.10.2.0 255.255.255.0 192.168.1.4100
  • D. ip route 10.10.2.1 255.255.255.255192.168.1.4100
Show Suggested Answer Hide Answer
Suggested Answer: D 🗳️
by Garfieldcat at Oct. 12, 2022, 6:08 a.m.

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EliasM
Highly Voted 2 years, 9 months ago
I dont understand why A and D are different. Host routes (/32) win because they have the longest prefix. Here, both A and D include the destination host, but they differ on AD. If you set the AD to 115, its higher than OSPF (110) but it will still prefer the longest prefix route, so i believe that A and D are both correct in this scenario. Correct me if im wrong.
upvoted 21 times
[Removed]
1 year, 7 months ago
Longest prefix-length takes precedence for *route selection*, while administrative distance takes precedence when deciding *which routes are installed into the routing table*. R1 has a route for the entire 10.10.2.0/24 subnet, learned via OSPF with the default AD of 110. 10.10.2.1/32 falls within the subnet 10.10.2.0/24, and so adding it with an AD of 115 means it won't get installed into the routing table. https://www.cisco.com/c/en/us/support/docs/ip/enhanced-interior-gateway-routing-protocol-eigrp/8651-21.html
upvoted 5 times
OuaisLeSang
10 months, 2 weeks ago
That's not completly true, Administrative distance takes precedence when deciding *which routes are installed into the routing table* ONLY when prefix are the same, it's literaly written in your link A and D both work because we don't have a route with a /32 prefix so the AD doesn't matter
upvoted 1 times
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AbdullahMohammad251
1 year, 7 months ago
It will get installed in the routing table even if it has an AD higher than 110. I simulated the network in packet tracer and both A and D work.
upvoted 2 times
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Garfieldcat
Highly Voted 2 years, 9 months ago
by the way, AD of OSFP should be 110
upvoted 7 times
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MinSun600
Most Recent 2 months, 3 weeks ago
Selected Answer: D
because the AD of OSPF is 110 so 100 inclusive with route but 115 higher out of the range of 110 as AD
upvoted 1 times
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MinSun600
1 year ago
i'm on 491 question and didn't see a lot of ACL questions ! everything is just about subnetting
upvoted 1 times
Essohjay
12 months ago
You will soon start seeing ACL questions. As you get close to 1000
upvoted 2 times
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AbdullahMohammad251
1 year, 8 months ago
Selected Answer: D
Both A & D would yield the same answer because the Longest prefix match takes precedence over administrative distance. I would pick D since it's a more suitable route. https://packetlife.net/blog/2010/aug/16/route-preference/#:~:text=Prefix%20Length%20%2D%20The%20longest%2Dmatching,lowest%20administrative%20distance%20is%20preferred.
upvoted 1 times
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msekmani
1 year, 9 months ago
how can be D the correct answer? the 10.10.2.1 is a user IP address, it should be 10.10.2.0.
upvoted 2 times
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NICE_ANSWERS
2 years, 1 month ago
Am i the only person seeing 192.168.1."4100" please, where from the last octect?
upvoted 4 times
[Removed]
2 years, 1 month ago
No, i do too. A space is missing
upvoted 2 times
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TechJ
2 years, 1 month ago
Selected Answer: D
I feel like the route would work either with or without the AD(administrative distance). I can see the reason why the answer is choosing the option with lower AD than 110(AD of OSPF), to prevent 10.10.2.1 route to R2 like all the other hosts in 10.10.2.0 network. But just like other two comments said, we apply 10.10.2.1/32, the longest mask always win, so AD shouldnt be necessary.
upvoted 5 times
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dropspablo
2 years, 2 months ago
In this case, I don't think the AD makes any difference (it can be anyone), because the longest mask always wins, it has the "/32 prefix", sending it to a specific host 10.10.2.1, it will go through R3 with any AD. And any other host on the 10.10.2.0/24 network will automatically go the OSPF route through R2. You can ignore the ADs, they are for distraction.
upvoted 3 times
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danny43213
2 years, 5 months ago
We don’t need to change the default AD
upvoted 6 times
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alejandro12
2 years, 8 months ago
Answer A The ad should be higher that route 110 ospf learned
upvoted 1 times
xbololi
2 years ago
alejandro please don't share your wisdow... its not right to teach people untrue facts.
upvoted 1 times
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IAmAlwaysWrongOnExamtopics
2 years, 7 months ago
definitely not, if the ad was higher, all the traffic to the subnet would go through R2, and the end host would never get traffic
upvoted 12 times
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Garfieldcat
2 years, 9 months ago
by default static route has AD 1, so no need to change AD to 100 if OSPF AD is 115
upvoted 1 times
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