ExamTopics Logo
Mail Us[email protected]
Menu
Cisco Discussions
exam questions

Exam 300-101 All Questions

View all questions & answers for the 300-101 exam
Go to Exam

Exam 300-101 topic 2 question 546 discussion

Actual exam question from Cisco's 300-101
Question #: 546
Topic #: 2
[All 300-101 Questions]

Refer to the exhibit. You have completed an OSPF implementation, and you are verifying OSPF operation. You notice that router A and router B are stuck in the two-way state. From the show ip ospf interface command output, what is the cause of this issue?

  • A. All OSPF implementations must have at least one interface in area 0.
  • B. You are attempting to run in the broadcast mode over an NBMA interface.
  • C. Both routers are configured to function as a BDR; therefore, there is no DR router.
  • D. Someone has changed the OSPF router ID; therefore you must clear the OSPF process.
Show Suggested Answer Hide Answer
Suggested Answer: E. The OSPF priority is set to 0 on both routers; therefore neither can become the DR. 🗳️
Explanation -
When OSPF adjacency is formed, a router goes through several state changes before it becomes fully adjacent with its neighbor. The states are Down, Attempt,
Init, 2-Way, Exstart, Exchange, Loading, and Full.
An OSPF neighbor reaches the 2-way state when bidirectional communication is established (each router has seen the other`s hello packet). This is the beginning of an OSPF adjacency. On broadcast media and non-broadcast multiaccess networks, the DR and BDR are elected in this state. But the priority on both routers are 0 so no DR and BDR are elected -> These routers stay in the 2-way state.
(Reference and a good resource of OSPF Neighbor states:
http://www.cisco.com/en/US/tech/tk365/technologies_tech_note09186a0080093f0e.shtml)
by Nemanja at Feb. 14, 2020, 7:37 p.m.

Comments

Chosen Answer:
This is a voting comment (?). It is better to Upvote an existing comment if you don't have anything to add.
Switch to a voting comment New
Submit Cancel
Nemanja
5 years, 2 months ago
E. The OSPF priority is set to 0 on both routers; therefore neither can become the DR.
upvoted 2 times
...
Community vote distribution
A (35%)
C (25%)
B (20%)
Other
Most Voted
A voting comment increases the vote count for the chosen answer by one.

Upvoting a comment with a selected answer will also increase the vote count towards that answer by one. So if you see a comment that you already agree with, you can upvote it instead of posting a new comment.

SaveCancel
exam
Someone Bought Contributor Access for:
SY0-701
London, 1 minute ago