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300-410 Practice Question: According to RFC 5880, what is the maximum number…
According to RFC 5880, what is the maximum number of BFD sessions that can be uniquely identified using the discriminator fields?
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
✓
2^32 (4,294,967,296)
The discriminator fields are 32-bit values, allowing up to 2^32 (approximately 4.29 billion) unique session identifiers.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✗
2^16 (65536)
Why it's wrong here
16-bit fields would allow 65536 sessions, but BFD uses 32-bit discriminators.
- ✗
2^24 (16,777,216)
Why it's wrong here
24-bit fields are not used; BFD discriminators are 32 bits.
- ✓
2^32 (4,294,967,296)
Why this is correct
The discriminator fields are 32-bit, providing over 4 billion unique session identifiers.
- ✗
Unlimited
Why it's wrong here
The number is limited by the 32-bit discriminator field size.
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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.