easyMultiple Choice
300-410 Practice Question: Runs the following command on Router R1: R1# show…
A network engineer runs the following command on Router R1:
R1# show bfd neighbors detail
IPv4 Sessions NeighborAddr LD/RD Int State Holdown(mult) Intf
10.1.1.2 1/3 Gi0/0 Up 3000(3) Gi0/0
Session state is UP and not using echo function. OurAddr: 10.1.1.1 Handle: 1 Local Diag: 0, Demand mode: 0, Poll bit: 0 MinTxInt: 1000000, MinRxInt: 1000000, Multiplier: 3 Received MinRxInt: 1000000, Received Multiplier: 3 Holddown (hits): 3000(0) Rx Count: 100, Tx Count: 100
Based on this output, what is the BFD session's local discriminator?
Answer choices
Why each option matters
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
The local discriminator is 1.
The local discriminator is the LD value shown in the output. In this case, it is 1.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✓
The local discriminator is 1.
Why this is correct
In the LD/RD column, the value before the slash is the local discriminator and the value after is the remote discriminator. The entry 1/3 therefore shows a local discriminator of 1, uniquely identifying this router's BFD session.
- ✗
The local discriminator is 3.
Why it's wrong here
3 is the detection multiplier, not a discriminator. The local discriminator is the LD value 1 (RD 3 is the neighbour's). Discriminators uniquely identify each session endpoint; the multiplier sets how many missed control packets trigger session teardown. Reading the LD/RD pair correctly matters when correlating sessions across devices.
- ✗
The local discriminator is 10.1.1.1.
Why it's wrong here
10.1.1.1 is R1's own source address (OurAddr), not the discriminator value. Discriminators are opaque non-zero integers exchanged in BFD control packets, shown as LD/RD 1/3. The local address would matter only for identifying which interface sources the BFD session.
- ✗
The local discriminator is 10.1.1.2.
Why it's wrong here
10.1.1.2 is the neighbour address, not a discriminator. The LD/RD column shows 1/3, so the local discriminator is 1. The neighbour address identifies the BFD peer's IP, and would be the answer only if the question asked which device the session terminates with.
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Variation 1. A network engineer runs the following command on Router R1: R1# show bfd neighbors detail IPv4 Sessions NeighborAddr LD/RD Int State Holdown(mult) Intf 10.1.1.2 1/3 Gi0/0 Up 3000(3) Gi0/0 Session state is UP and not using echo function. OurAddr: 10.1.1.1 Handle: 1 Local Diag: 0, Demand mode: 0, Poll bit: 0 MinTxInt: 1000000, MinRxInt: 1000000, Multiplier: 3 Received MinRxInt: 1000000, Received Multiplier: 3 Holddown (hits): 3000(0) Rx Count: 100, Tx Count: 100 Based on this output, what is the BFD session's remote discriminator?
easy- ✓ A.The remote discriminator is 3.
- B.The remote discriminator is 1.
- C.The remote discriminator is 10.1.1.2.
- D.The remote discriminator is 10.1.1.1.
Why A: The remote discriminator is the RD value shown in the output. In this case, it is 3.
JA
Written by Johnson Ajibi, MSc IT Security
Senior Network & Security Engineer · founder of Courseiva
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.