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F5 Networks 301b Exam - Topic 4 Question 67 Discussion

An LTM Specialist is tasked with ensuring that the syslogs for the LTM device are sent to a remote syslog server.The following is an extract from the config file detailing the node and monitor that the LTM device is using for theremote syslog server:monitorSyslog_15002 {defaults from udpdest *:15002}node 91.223.45.231 {monitor Syslog_15002screen RemoteSYSLOG}There seem to be problems communicating with the remote syslog server. However, the pool monitor shows that the remote server is up.The network department has confirmed that there are no firewall rules or networking issues preventing the LTM device fromcommunicating with the syslog server. The department responsible for the remote syslog server indicates that there maybe problems with the syslog server. The LTM Specialist checks the BIG-IP LTM logs for errors relating to the remote syslogserver. None are found. The LTM Specialist does a tcpdump:tcpdump -nn port 15002, with the following results:21:28:36.395543 IP 192.168.100.100.44772 > 91.223.45.231.15002: UDP, length 1921:28:36.429073 IP 192.168.100.100.39499 > 91.223.45.231.15002: UDP, length 16921:28:36.430714 IP 192.168.100.100.39499 > 91.223.45.231.15002: UDP, length 18121:28:36.840524 IP 192.168.100.100.39499 > 91.223.45.231.15002: UDP, length 16921:28:36.846547 IP 192.168.100.100.39499 > 91.223.45.231.15002: UDP, length 18121:28:39.886343 IP 192.168.100.100.39499 > 91.223.45.231.15002: UDP, length 144NotE. 192.168.100.100 is the self IP of the LTM device.Why are there no errors for the remote syslog server in the log files?
B) The monitor type used is inappropriate.
A) The -log option for tcpdump needs to be used.
C) The 'verbose' logging option needs to be enabled for the pool.
D) When the remote syslog sever fails, it returns to service before the timeout for the monitor has expired.

F5 Networks 301b Exam - Topic 4 Question 67 Discussion

Actual exam question for F5 Networks's 301b exam
Question #: 67
Topic #: 4
[All 301b Questions]

An LTM Specialist is tasked with ensuring that the syslogs for the LTM device are sent to a remote syslog server.

The following is an extract from the config file detailing the node and monitor that the LTM device is using for the

remote syslog server:

monitor

Syslog_15002 {

defaults from udp

dest *:15002

}

node 91.223.45.231 {

monitor Syslog_15002

screen RemoteSYSLOG

}

There seem to be problems communicating with the remote syslog server. However, the pool monitor shows that the remote server is up.

The network department has confirmed that there are no firewall rules or networking issues preventing the LTM device from

communicating with the syslog server. The department responsible for the remote syslog server indicates that there may

be problems with the syslog server. The LTM Specialist checks the BIG-IP LTM logs for errors relating to the remote syslog

server. None are found. The LTM Specialist does a tcpdump:

tcpdump -nn port 15002, with the following results:

21:28:36.395543 IP 192.168.100.100.44772 > 91.223.45.231.15002: UDP, length 19

21:28:36.429073 IP 192.168.100.100.39499 > 91.223.45.231.15002: UDP, length 169

21:28:36.430714 IP 192.168.100.100.39499 > 91.223.45.231.15002: UDP, length 181

21:28:36.840524 IP 192.168.100.100.39499 > 91.223.45.231.15002: UDP, length 169

21:28:36.846547 IP 192.168.100.100.39499 > 91.223.45.231.15002: UDP, length 181

21:28:39.886343 IP 192.168.100.100.39499 > 91.223.45.231.15002: UDP, length 144

NotE. 192.168.100.100 is the self IP of the LTM device.

Why are there no errors for the remote syslog server in the log files?

Show Suggested Answer Hide Answer
Suggested Answer: B

by Erick at Mar 20, 2023, 06:18 AM

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Gianna
10 months ago
What if the syslog server is just dropping packets?
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Celeste
10 months ago
Agree, the monitor could be inappropriate for this setup.
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Linwood
10 months ago
Surprised there are no errors! Thought it would log something.
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Fausto
11 months ago
I think the monitor type might be the issue.
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Joanna
11 months ago
The tcpdump shows packets going out, so no errors in logs makes sense.
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Elza
11 months ago
I wonder if the remote syslog server is just recovering too quickly for the monitor to catch the failure. That might explain the lack of errors in the logs.
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Carey
11 months ago
I feel like the verbose logging option might be something we overlooked in practice. It could help us see more details about the syslog communication.
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Marget
11 months ago
I think I came across a similar question where the tcpdump output showed packets being sent, but the logs didn't reflect any errors. Could it be related to the monitor timeout?
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Merri
11 months ago
I remember studying how syslog monitors work, but I'm not sure if the monitor type is really the issue here.
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Santos
11 months ago
I’m not entirely sure, but could it be that the syslog server is recovering too quickly for the monitor to catch the failure?
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Madonna
11 months ago
I feel like we had a similar question about syslog issues in practice, and I think it was related to the monitor timing out too quickly.
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Yuette
11 months ago
I think the tcpdump output shows that packets are being sent, so maybe the logging level isn't set high enough?
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Graciela
11 months ago
I remember we discussed how the monitor type can affect the logging, but I'm not sure if it's inappropriate in this case.
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Hannah
11 months ago
I think the key here is that a charge is the initial step of filing a formal complaint, not necessarily proof that discrimination has already been established. I'm going with option D.
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Emmanuel
11 months ago
Okay, I think I've got this. The key is in the prompt - it says the parentheses are automatically highlighted, so that must mean the answer is "Yes" since that indicates the presence of complimenting parentheses. I'll go with that.
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Melinda
1 year ago
Ooh, a tricky one! The tcpdump data looks good, so it's probably not a network problem. Maybe the remote syslog server is just having a bad day and dropping packets occasionally. Option D sounds like the most likely culprit. Gotta love those intermittent issues!
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Dominic
1 year ago
Intermittent issues can be a pain to troubleshoot, but at least we have a possible explanation now.
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Lamar
1 year ago
Yeah, that could explain why there are no errors in the log files.
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Goldie
1 year ago
Option D) When the remote syslog sever fails, it returns to service before the timeout for the monitor has expired.
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Joye
1 year ago
I'm going to go with Option D. If the remote syslog server is flaky and recovering before the monitor timeout, that would explain why the LTM logs don't show any errors. The tcpdump output suggests the traffic is flowing, so the issue must be on the server side.
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Dong
1 year ago
Exactly. The issue seems to be with the server itself, not the LTM device.
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Marya
1 year ago
So, if the server is going down and coming back up quickly, it would explain why there are no errors in the logs.
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Eleni
1 year ago
That's a good point. The tcpdump output does show traffic flowing to the server.
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Buffy
1 year ago
I think Option D makes sense. The server might be recovering before the monitor timeout.
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Kerry
1 year ago
Exactly. In that case, the LTM logs wouldn't show errors because the server is back up before the timeout expires.
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Reta
1 year ago
It's possible that the server is failing intermittently, causing it to recover before the monitor timeout triggers.
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Glenn
1 year ago
That makes sense. The tcpdump output shows traffic flowing, so the server side could be the issue.
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Mica
1 year ago
Option D seems like a logical choice. The server might be recovering before the monitor timeout.
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Van
1 year ago
Haha, the LTM Specialist must be a real troubleshooting wizard to not find any errors in the logs. Maybe they should try turning it off and on again, that usually works! (Just kidding, but seriously, no errors in the logs is a bit suspicious.)
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Lucina
1 year ago
Option D sounds plausible. If the remote syslog server is briefly failing and then coming back up before the monitor timeout, the LTM would not see any errors in the logs. Might be worth checking the server's status more closely.
upvoted 0 times
Sonia
1 year ago
Might be worth checking the server's status more closely.
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Glen
1 year ago
Option D sounds plausible. If the remote syslog server is briefly failing and then coming back up before the monitor timeout, the LTM would not see any errors in the logs.
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Kris
1 year ago
Maybe enabling the 'verbose' logging option for the pool could help identify the issue.
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Nan
1 year ago
I agree with Glynda. The monitor type might not be suitable for the remote syslog server.
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Lindsay
1 year ago
The tcpdump output shows that the LTM device is sending UDP packets to the remote syslog server, so the issue doesn't seem to be with the network connectivity. The monitor is likely set up correctly, so the problem must be with the remote syslog server itself.
upvoted 0 times
Sharmaine
1 year ago
D) When the remote syslog sever fails, it returns to service before the timeout for the monitor has expired.
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Mitzie
1 year ago
C) The 'verbose' logging option needs to be enabled for the pool.
upvoted 0 times
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Dorothea
1 year ago
B) The monitor type used is inappropriate.
upvoted 0 times
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Lilli
1 year ago
A) The -log option for tcpdump needs to be used.
upvoted 0 times
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Glynda
1 year ago
I think the monitor type used is inappropriate.
upvoted 0 times
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