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Exam 200-301 topic 1 question 401 discussion

Actual exam question from Cisco's 200-301
Question #: 401
Topic #: 1
[All 200-301 Questions]

Refer to the exhibit. Given the output for this command, if the router ID has not been manually set, what router ID will OSPF use for this router?

  • A. 10.1.1.2
  • B. 10.154.154.1
  • C. 172.16.5.1
  • D. 192.168.5.3
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Suggested Answer: C 🗳️
The highest IP address of all loopback interfaces will be chosen -> Loopback 0 will be chosen as the router ID.
by Ali526 at Jan. 3, 2021, 4:41 a.m.

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Ali526
Highly Voted 3 years, 10 months ago
C is correct and so is the reasoning. If router ID is not manually setup, the highest loopback IP is selected and if there is no loopback, highest IP from the interface IPs is selected.
upvoted 24 times
SasithCCNA
3 years, 7 months ago
Accurate explanation
upvoted 4 times
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[Removed]
Most Recent 7 months, 1 week ago
Selected Answer: C
C is correct
upvoted 2 times
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rafaelobdelgado
9 months, 2 weeks ago
sorry for my lack of knowledge but how 172 is higher than 192.168?
upvoted 1 times
eb63e5a
6 months, 2 weeks ago
192.168... is not given as loopback address.
upvoted 1 times
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EXD
1 year ago
and why not C ? If the loopback was not manually set (it is, but if was not), then C is the right answer.. this is the trick here.
upvoted 1 times
EXD
1 year ago
yes, one more day and I found it, the IP is given manually, so the loopback is the answer (C)
upvoted 1 times
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[Removed]
1 year, 1 month ago
1. Router ID 2. Biggest Loopback Interface 3. Biggest phy. Interface
upvoted 1 times
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Dutch012
1 year, 8 months ago
did we choose (C) because 172 > 10 (B) ?
upvoted 2 times
Chopaka
1 year, 4 months ago
Sorry maat, niemand snapt hem helaas
upvoted 1 times
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kyleptt
1 year, 4 months ago
yes that is why
upvoted 1 times
fefyk
7 months, 3 weeks ago
how is 172.16.0.0 > then 10.0.0.0 network implicit ip address
upvoted 1 times
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SONG00992
2 years, 11 months ago
The highest IP address of any logical interface will always become a router's RID. Loopback interface is the logical interface. So answer is C.
upvoted 1 times
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Scipions
3 years, 6 months ago
Grazie a sta ceppa
upvoted 2 times
redivivo
2 years, 5 months ago
very accurate
upvoted 1 times
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Community vote distribution
A (35%)
C (25%)
B (20%)
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