Quick Answer
The answer is Up. The BFD session state Up indicates that the session is fully established and operational, meaning both routers have completed the three-way handshake and are successfully exchanging control packets at the negotiated interval. This state confirms bidirectional forwarding path integrity, and once reached, BFD can rapidly trigger convergence if a failure is detected. On the Cisco CCNP ENARSI 300-410 exam, this concept tests your understanding of BFD state progression, often appearing in questions about high-availability features like BFD-assisted routing protocol fast failover. A common trap is confusing the Init state with Up—remember that Init is only a transitional phase where one side has received a packet but not yet established bidirectional communication. For a quick memory tip, think of the BFD states as a simple ladder: Down, Init, Up—and only Up means both ends are fully talking.
This 300-410 practice question tests your understanding of bidirectional forwarding detection (bfd). Read the scenario carefully and evaluate each option against the stated constraints before committing to an answer. After answering, compare your reasoning against the explanation and wrong-answer breakdown below. Once you have made your selection, read the full explanation to reinforce the concept and understand why each distractor is designed to mislead on exam day.
Which BFD session state indicates that the session is fully established and operational?
Down
Why wrong: Down indicates no session exists or the session has failed.
Init
Why wrong: Init indicates that the local router has received a BFD packet but the remote router has not yet confirmed the session.
Up
Up is the state where the BFD session is fully established and both routers agree on parameters.
AdminDown
Why wrong: AdminDown indicates the session has been administratively disabled.
Answer choices
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
Up
The Up state indicates that the BFD session is fully established, and both routers are exchanging control packets successfully.
Key principle: Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
Answer analysis
For each option: why learners choose it and why it is or isn't the right answer here.
Down
Why it's wrong here
Down indicates no session exists or the session has failed.
Init
Why it's wrong here
Init indicates that the local router has received a BFD packet but the remote router has not yet confirmed the session.
Up
Why this is correct
Up is the state where the BFD session is fully established and both routers agree on parameters.
Related concept
Read the scenario before looking for a memorised answer.
AdminDown
Why it's wrong here
AdminDown indicates the session has been administratively disabled.
Common exam traps
Many certification questions include familiar terms but test a specific constraint. Read the exact wording before choosing an answer that is generally true but wrong for this case.
Detailed technical explanation
This question should be treated as a scenario, not a definition check. Identify the problem, the constraint and the best action. Then compare each option against those facts.
Key takeaway
Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
Real-world example
A practitioner preparing for the 300-410 exam encounters this exact type of scenario on the job. The correct answer here is not the most general option — it is the best answer for the specific constraint described. Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option. Real exam questions reward reading the full scenario before eliminating options, because the constraint defines which answer fits.
What to study next
Identify which 300-410 exam domain this question belongs to, then review the specific concept being tested. Practise related questions in that domain and focus on understanding why each wrong answer is tempting — not just why the correct answer is right.
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FAQ
Bidirectional Forwarding Detection (BFD) — This question tests Bidirectional Forwarding Detection (BFD) — Read the scenario before looking for a memorised answer..
The correct answer is: Up — The Up state indicates that the BFD session is fully established, and both routers are exchanging control packets successfully.
Identify which 300-410 exam domain this question belongs to, then review the specific concept being tested. Practise related questions in that domain and focus on understanding why each wrong answer is tempting — not just why the correct answer is right.
Read the scenario before looking for a memorised answer.
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Last reviewed: Jun 18, 2026
This 300-410 practice question is part of Courseiva's free Cisco certification practice question bank. Courseiva provides original exam-style practice questions with explanations, topic-based practice, mock exams, readiness tracking, and study analytics to help learners prepare for the 300-410 exam.
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