Discuss Infoblox NIOS-DDI-Expert Exam Topic 6 Question 22

What protocol and port does DHCP Failover use to keep lease information synchronized between two peers?

ADefault is TCP 1194, can be user configured

BDefault is UDP 1194, can be user configured

CDefault is TCP 647, can be user configured

DDefault is UDP 647, can be user configured

Suggested Answer: C

Comprehensive and Detailed In-Depth

Infoblox NIOS implements DHCP Failover based on the IETF DHCP Failover protocol (draft standard), using TCP port 647 by default for lease synchronization between peers. This port facilitates the exchange of lease data to ensure both the primary and secondary servers maintain consistent states (e.g., NORMAL, COMMUNICATIONS-INTERRUPTED). TCP is used for reliability, as lease sync requires guaranteed delivery. The port can be changed by the administrator if needed (e.g., for firewall rules), making 'user configured' accurate. Options A and B (port 1194) are incorrect---1194 is commonly associated with OpenVPN, not DHCP Failover. Option D is wrong because it's TCP, not UDP. This is a key DHCP troubleshooting topic in the INE course.

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22 comments · newest first

Yaeko 2 days ago

I agree, D makes sense. UDP is typical for DHCP.

Silvana 7 days ago

I think it's D, UDP 647. Seems right for DHCP.

Arlen 12 days ago

I think A is a trick option. It's definitely not TCP.

Leandro 17 days ago

I remember reading about UDP 647 in a guide. Seems right.

An 23 days ago

I feel like D is the most common answer.

Alison 28 days ago

I was leaning towards C. TCP 647 sounds familiar.

Omega 1 month ago

I agree, D makes sense. UDP is faster for this.

Corinne 1 month ago

I think it's D. UDP 647 is the right one.

Olene 1 month ago

I thought DHCP used a different port altogether!

Elke 2 months ago

Yeah, it's definitely UDP 647.

Sophia 2 months ago

Wait, is it really UDP? I thought it was TCP.

Whitney 2 months ago

Totally agree, that's the standard.

Jesse 2 months ago

It's UDP 647 for sure!

Paz 2 months ago

Are we sure about that? Sounds a bit off to me.

Felix 2 months ago

Yup, UDP 647 is the default, can't go wrong there.

Alishia 3 months ago

Wait, is it really UDP? I thought it was TCP.

Alonso 3 months ago

Totally agree, it's definitely UDP!

Junita 3 months ago

It's UDP 647, for sure.

Judy 3 months ago

I thought DHCP Failover was TCP 647, but now I'm second-guessing myself. Did we cover this in class?

Micah 3 months ago

I feel like the answer is UDP 647, but I might be mixing it up with another protocol.

Daren 4 months ago

I remember practicing a question about DHCP, and I think the port was 647, but I can't recall if it was TCP or UDP.

Pansy 5 months ago

I think DHCP Failover uses UDP, but I'm not sure about the port number. Was it 647 or something else?

Infoblox NIOS-DDI-Expert Exam - Topic 6 Question 22 Discussion