Exam 300-101 topic 2 question 545 discussion

Actual exam question from Cisco's 300-101

Question #: 545
Topic #: 2

You have just completed an OSPF implementation. While executing your verification plan, you determine that R1 is not able to establish full OSPF adjacency with
R2. The show ip ospf neighbor command output on R1 shows that R2 is stuck in the INIT state.
What could be the cause of this problem?

A. DR and BDR election errors between R1 and R2.
B. The R2 router has not received the OSPF hello packets from the R1 router.
C. Mismatched interface maximum transmission unit (MTU) configuration between the R1 and R2.
D. Mismatched OSPF hello interval configuration between the R1 and R2.

Show Suggested Answer

Suggested Answer: E. Corrupted LSAs exchanges between the R1 and R2. 🗳️
Explanation -
When a router receives an OSPF Hello from a neighbor, it sends the Hello packet by including that neighbor`s router ID in the Hello packet. If the neighbor does not receive this packet (means that it doesn`t see itself in this packet), it will be stuck in INIT state. INIT state can be understood as a one-way Hello. An example of a router stuck in INIT state is shown below:

by Nemanja at Feb. 14, 2020, 7:33 p.m.

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Nemanja

5 years, 4 months ago

B. The R2 router has not received the OSPF hello packets from the R1 router.

upvoted 2 times

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