Discuss F5 Networks F5CAB4 Exam Topic 3 Question 9

When looking at this BIG-IP prompt: root@virtual-bigip1] Peer Time Out of Sync

What does the message indicate? (Choose one answer)

AThat one of the NTP sources has a skewed clock

BThat the peer BIG-IP is unreachable for the device group

CThat the local time is correct, but the remote time is incorrect

DThat there was a time synchronization issue between the BIG-IP device and its peer

Suggested Answer: D

Comprehensive and Detailed Explanation From BIG-IP Administration Control Plane Administration documents:

On BIG-IP systems that participate in a Device Service Cluster (DSC), each device compares the remote device's system time to its own system time. If the difference is outside the ConfigSync time threshold (commonly referenced as 3 seconds by default), BIG-IP updates the shell prompt to show ''Peer Time Out of Sync'', and ConfigSync operations may fail until time is corrected (typically by fixing NTP reachability/configuration, or in some cases adjusting the threshold). (cdn.studio.f5.com)

This message is specifically about time drift between peers in the trust domain/DSC---not basic reachability (so B is not what it means), and it does not prove which side is ''correct'' (so C is too specific). It also doesn't directly mean an NTP source is ''skewed'' (A can be a cause, but the prompt message itself indicates the peer-to-peer time mismatch condition). (cdn.studio.f5.com)

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20 comments · newest first

Lucina 2 months ago

D is the best choice. It covers all sync issues.

Thaddeus 2 months ago

I feel like C is a bit off. Local time should be accurate.

Lenna 2 months ago

B seems possible too. If the peer is unreachable, it could show this.

Rene 2 months ago

I’m leaning towards A. A skewed clock can cause this.

Aracelis 2 months ago

I agree, D makes sense. Peers need to sync.

Willard 3 months ago

I think it's D. Time sync issues are common.

Desire 3 months ago

B seems plausible too, maybe the peer is just unreachable.

Ettie 3 months ago

Wait, how can the local time be correct if the peer is out of sync?

Genevieve 3 months ago

I agree with D, it's usually about the sync problem.

Lashawnda 3 months ago

I think it's A, one of the NTP sources must be off.

Myra 3 months ago

Definitely D, time sync issues are common with BIG-IP.

Dottie 4 months ago

I'm surprised this isn't more of a frequent issue!

Shasta 4 months ago

Wait, could it really be B? What if the peer is just down?

Dahlia 4 months ago

I agree with D, that's what it sounds like.

Melinda 6 months ago

I think it's A, one of the NTP sources must be off.

Beata 6 months ago

Definitely D, time sync issues are common.

Myong 6 months ago

I lean towards D as well, but I wonder if C could apply if the local time is fine and only the peer is off.

Harrison 6 months ago

I feel like it could be B since it mentions the peer being unreachable, but that doesn't seem to fit the "time out of sync" part.

Annmarie 7 months ago

I remember a practice question about NTP issues, and I think A could be a possibility too if one source has a skewed clock.

Marylou 7 months ago

I think the message might mean there's a time sync issue, so maybe it's D? But I'm not entirely sure.

F5 Networks F5CAB4 Exam - Topic 3 Question 9 Discussion