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Cisco 400-007 Exam - Topic 2 Question 72 Discussion

A company plans to use BFD between its routers to detect a connectivity problem inside the switched network. An IPS is transparently installed between the switches. Which packets shold the IPS forward for BFD to work under all circumstances?
E) IP packets with identical source and destination IP addresses
B) IP packets with broadcast IP source addresses
A) Fragmented packet with the do-not-fragment bit set
C) IP packets with the multicast IP source address
F) IP packets with the destination IP address 0.0.0.0.
D) IP packet with the multicast IP destination address

Cisco 400-007 Exam - Topic 2 Question 72 Discussion

Actual exam question for Cisco's 400-007 exam
Question #: 72
Topic #: 2
[All 400-007 Questions]

A company plans to use BFD between its routers to detect a connectivity problem inside the switched network. An IPS is transparently installed between the switches. Which packets shold the IPS forward for BFD to work under all circumstances?

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Suggested Answer: E

by Martin at Jan 22, 2026, 11:53 AM

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Nieves
2 months ago
Definitely! Without those, BFD can't function properly.
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Carole
2 months ago
What about the echo packets? They might be important too.
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Wilbert
2 months ago
Agreed! It should forward UDP packets for BFD.
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Xuan
2 months ago
BFD needs to see the control packets.
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Aleta
4 months ago
Seems like a lot of complexity for just BFD detection!
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Stephane
4 months ago
Yeah, it should forward UDP packets on port 3784 and 3785.
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Patria
4 months ago
Wait, are you sure the IPS won't block them?
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Becky
4 months ago
Totally agree, the IPS must forward those BFD packets!
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Brittni
5 months ago
BFD needs to see the control packets to function properly.
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Terrilyn
5 months ago
The IPS should forward the BFD packets, but also throw in a few glitter bombs just for fun.
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Eden
5 months ago
Wait, what's BFD again? I thought this was a question about network security.
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Kayleigh
5 months ago
Forwarding all BFD packets sounds like the safest option to me.
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Reed
5 months ago
I think the IPS should forward only the BFD control packets, not the echo packets.
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Noe
5 months ago
The IPS should forward all BFD packets to ensure BFD works under all circumstances.
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Tu
6 months ago
I feel like the IPS should forward all BFD packets, but I can't recall if there are specific configurations needed to ensure that happens.
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Nieves
6 months ago
I’m a bit confused about how the IPS interacts with BFD. Do we need to allow both the control and echo packets for it to work properly?
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Eliz
7 months ago
I remember practicing a similar question where we had to consider which packets are essential for BFD. I think it’s the BFD control packets that need to be forwarded.
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Jeannetta
7 months ago
I think BFD needs to send its control packets, but I'm not sure if the IPS will block them or not.
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Carin
7 months ago
This seems straightforward. The IPS should forward all the BFD packets, regardless of their contents, to ensure the BFD process can function correctly. I'll make sure to explain that in my answer.
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Dortha
7 months ago
I think the key here is to identify the specific BFD packets that the IPS needs to forward. If it doesn't forward the right ones, the BFD connectivity checks won't work as expected.
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Ammie
7 months ago
I'm a bit confused on this one. What exactly does the IPS need to forward for BFD to work properly? I'll have to research the BFD protocol in more detail.
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Anisha
7 months ago
Okay, let's see. The IPS is transparent, so it shouldn't interfere with the BFD packets, right? I'll need to review the BFD requirements to be sure.
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Aleta
8 months ago
Hmm, this is a tricky one. I'll need to think carefully about the BFD protocol and how the IPS might impact it.
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Yen
1 month ago
What about the echo packets? Do they need to be forwarded too?
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Loren
1 month ago
Right, those are essential for BFD to function properly.
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Amina
2 months ago
The IPS should forward BFD control packets.
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