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300-410 Practice Question: Which THREE statements about BFD multihop…
Which THREE statements about BFD multihop sessions are true? (Choose THREE.)
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
✓
Multihop BFD is used when the neighbors are not directly connected.
BFD multihop sessions are used when the two routers are not directly connected, requiring multiple hops. They use a different destination UDP port (4784) compared to single-hop sessions (3784). Additionally, multihop sessions require explicit configuration of the BFD source and destination IP addresses. The other statements are false because multihop sessions do not require the same subnet, and they can operate over any routed path.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✓
Multihop BFD is used when the neighbors are not directly connected.
Why this is correct
Multihop BFD supports sessions between routers separated by multiple Layer 3 hops.
- ✓
Multihop BFD uses UDP destination port 4784.
Why this is correct
The IANA-assigned port for BFD multihop is 4784.
- ✓
Multihop BFD requires configuration of the source and destination IP addresses.
Why this is correct
You must specify the BFD source and destination addresses using the 'bfd map' command or similar.
- ✗
Multihop BFD requires both routers to be in the same subnet.
Why it's wrong here
Multihop sessions can span different subnets; they are not limited to directly connected subnets.
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Multihop BFD can only be used with BGP.
Why it's wrong here
Multihop BFD can be used with various routing protocols, including OSPF, EIGRP, and static routes.
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Written by Johnson Ajibi, MSc IT Security
Senior Network & Security Engineer · founder of Courseiva
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