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Exam 200-301 topic 1 question 352 discussion

Actual exam question from Cisco's 200-301
Question #: 352
Topic #: 1
[All 200-301 Questions]

R1 has learned route 10.10.10.0/24 via numerous routing protocols. Which route is installed?

  • A. route with the next hop that has the highest IP
  • B. route with the lowest cost
  • C. route with the lowest administrative distance
  • D. route with the shortest prefix length
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Suggested Answer: C 🗳️

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diamcle
Highly Voted 3 years, 12 months ago
Route Preference: 1. Longest Prefix 2. Administrative Distance 3. Metric In this specific question, the first option is: Administrative Distance.
upvoted 26 times
sinear
3 years, 9 months ago
Those rules u mention are for the route selection. Here the question is about route insertion. Longest Prefix does not play a role for inserting in the table, only for selecting a route.
upvoted 20 times
packitr3lgud
3 years, 8 months ago
Sinear is correct. https://www.cisco.com/c/en/us/support/docs/ip/enhanced-interior-gateway-routing-protocol-eigrp/8651-21.html "The longest prefix match always wins among the routes actually installed in the routing table, while the routing protocol with the lowest administrative distance always wins when installing routes into the routing table."
upvoted 19 times
oooMooo
3 years, 6 months ago
Nice quote!
upvoted 5 times
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MinSun600
Most Recent 1 month, 3 weeks ago
Selected Answer: C
worded question makes you hesitate
upvoted 1 times
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[Removed]
7 months, 1 week ago
Selected Answer: C
C is correct
upvoted 1 times
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ZUMY
2 years, 3 months ago
C is correct
upvoted 1 times
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[Removed]
2 years, 3 months ago
Ref: Route Selection in Cisco Routers – Cisco “… Building the Routing Table … As each routing process receives updates and other information, it chooses the best path to any given destination and attempts to install this path into the routing table. For instance, if EIGRP learns of a path toward 10.1.1.0/24, and decides this particular path is the best EIGRP path to this destination, it tries to install the path it has learned into the routing table. The router decides whether or not to install the routes presented by the routing processes based on the administrative distance of the route in question. If this path has the lowest administrative distance to this destination (when compared to the other routes in the table), it's installed in the routing table. If this route isn't the route with the best administrative distance, then the route is rejected. …” A. route with the next hop that has the highest IP Wrong answer. B. route with the lowest cost Wrong answer. C. route with the lowest administrative distance Correct answer. D. route with the shortest prefix length Wrong answer.
upvoted 1 times
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Anarckii
2 years, 10 months ago
Selected Answer: C
Installed and input are the same thing, don't overthink it. The reason the answer is C is because longest prefix isn't mentioned in one of the answers. So the next best thing to think of is the lowest admin distance
upvoted 1 times
Naj_Val
2 years, 10 months ago
The answer is indeed C, but I'd like to correct an inaccuracy in your reasoning. The length of the prefix is the same for all of the routes, as is stated in the question. "R1 has learned route 10.10.10.0/24 via numerous routing protocols", meaning the prefix length is the same. Therefore, the next most relevant parameter is AD.
upvoted 3 times
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4guysgaming
3 years, 4 months ago
Why does the question say "lowest" admin distance instead of higher?
upvoted 1 times
Taku2023
1 year, 7 months ago
don't confuse longest prefix and high administrative distance
upvoted 1 times
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Genshin
3 years ago
because when the router is trying to determine which route it wants in its table, it will choose the "lowest" ( the shortest path ).
upvoted 2 times
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yasyas
2 years, 11 months ago
lowest distance = higest priority
upvoted 1 times
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A (35%)
C (25%)
B (20%)
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