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Exam 300-101 topic 1 question 247 discussion

Actual exam question from Cisco's 300-101
Question #: 247
Topic #: 1
[All 300-101 Questions]

If routers in a single area are configured with the same priority value, what value does a router use for the OSPF Router ID in the absence of a loopback interface?

  • A. The lowest IP address of any physical interface
  • B. The highest IP address of any physical interface
  • C. The lowest IP address of any logical interface
  • D. The highest IP address of any logical interface
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Suggested Answer: B 🗳️

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Haggyman
5 years, 3 months ago
Depends on how you look at it. A manual configured RID is always used. So when the RID election process starts, that means there is no manual configured RID. btw: non-loopback is incorrect. It should be specifically physical interface. Also see: https://ccieme.wordpress.com/2013/06/06/ospf-fundamentals-router-id-rid-calculation-and-dr-bdr-election-tips/#targetText=The%20OSPF%20RID%20Selection%20Process,NOT*%20automatically%20advertised%20by%20OSPF. So answer is correct.
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edlaffer
5 years, 7 months ago
Wrong Answer OSPF uses the following criteria to select the router ID: Manual configuration of the router ID. Highest IP address on a loopback interface. Highest IP address on a non-loopback interface
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soon
4 years, 11 months ago
its correct, keyword is "absence of a loopback interface"... so answer is highest IP of physical interface.
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