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F5 Networks 301b Exam - Topic 5 Question 38 Discussion

Posted by Louisa on May 07, 2022 at 08:29 AM

-- Exhibit --

-- Exhibit --

Refer to the exhibit.

Users receive an error when attempting to connect to the website https://website.com. The website has a DNS record of 195.56.67.90. The upstream ISP has confirmed that there is nothing wrong with the routing between the user and the LTM device.

The following tcpdump outputs have been captured:

External Vlan, filtered on IP 168.210.232.5

00:25:07.598519 IP 168.210.232.5.33159 > 195.56.67.90.https: S 1920647964:1920647964(0) win 8192

00:25:07.598537 IP 195.56.67.90.https > 168.210.232.5.33159: S 2690691360:2690691360(0) ack 1920647965 win 4350

00:25:07.598851 IP 168.210.232.5.33160 > 195.56.67.90.https: S 2763858764:2763858764(0) win 8192

00:25:07.598858 IP 195.56.67.90.https > 168.210.232.5.33160: S 1905576176:1905576176(0) ack 2763858765 win 4350

Internal Vlan, filtered on IP 168.210.232.5

00:31:46.171124 IP 168.210.232.5.33202 > 192.168.100.20.http: S 2389057240:2389057240(0) win 4380

What is the problem?

Suggested Answer: D

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12 comments · newest first
ES
Estrella 12 months ago
I agree, the virtual server port could be misconfigured.
EL
Elroy 12 months ago
Definitely not the tcpdump filters, those look correct.
AR
Arlette 1 year ago
Wait, could it really be the subnet masks? That seems odd.
MA
Marge 1 year ago
I think the firewall might be the issue here.
JE
Jess 1 year ago
Looks like the DNS entry is fine since the ISP confirmed routing.
JA
Janessa 1 year ago
The firewall dropping connections sounds plausible, especially since the ISP confirmed routing is fine, but I’m not entirely confident.
MA
Margery 1 year ago
I think the virtual server listening on the wrong port could be a possibility, but I need to double-check the configurations we studied.
DE
Dean 1 year ago
This question feels similar to one we practiced about DNS issues, but I can't recall if the DNS entry is definitely the culprit.
LA
Lashunda 1 year ago
I remember we discussed how tcpdump can help identify connection issues, but I'm not sure if the filters are the problem here.
IS
Isabelle 1 year ago
Hmm, this seems like a tricky one. I'll need to think through the options carefully to figure out the best approach.
RO
Roxane 1 year ago
Hmm, I'm a little unsure about this one. I know we covered purchase orders and receiving reports, but I can't quite remember which other documents are typically used across those departments. I'll have to think it through step-by-step.
NI
Nieves 1 year ago
Hmm, I'm a bit confused. Could it also become a root port instantly? That sounds familiar, but I can't recall the specifics.
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