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300-410 Practice Question: Which BFD packet type is used for initial session…
Which BFD packet type is used for initial session establishment and carries the discriminator values?
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
✓
BFD Control packets
BFD Control packets are used for session establishment, carrying local and remote discriminator values, and are sent periodically to maintain the session.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✗
BFD Echo packets
Why it's wrong here
Echo packets are used for fast failure detection by looping back, not for session establishment.
- ✓
BFD Control packets
Why this is correct
Control packets are the primary BFD packets used for session establishment, maintenance, and teardown, and they carry discriminator fields.
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BFD Poll packets
Why it's wrong here
Poll packets are not a standard BFD type; BFD uses Control and Echo packets only.
- ✗
BFD Hello packets
Why it's wrong here
Hello packets are not defined in BFD; BFD uses Control packets for keepalive functionality.
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Written by Johnson Ajibi, MSc IT Security
Senior Network & Security Engineer · founder of Courseiva
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