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Category: 301b

Exam F5 301b : LTM Specialist: Maintain & Troubleshoot

What is the problem?

Refer to the exhibit.
An LTM device is used to load balance web content over a secure channel.
The developers of the web content have done a trace using an HTTP profiler application. They believe that
allowing the LTM device to compress traffic to the client will improve performance. The client can utilize
GZIP or deflate compression algorithms.
An LTM Specialist must implement the compression.
The LTM Specialist has completed the following actions:
1. Create the relevant profile.
2. Apply the relevant profile to the virtual server (VS).
After applying the relevant profile, the LTM device is failing to compress the traffic. Instead, the traffic is
being served with an error.
What is the problem?

Why does the IP address of 10.123.17.12 fail to appear …

Refer to the exhibit.

A company uses a complex piece of client software that connects to one or more virtual servers (VS)
hosted on an LTM device. The client software is experiencing issues. An LTM Specialist must determine
the cause of the problem.
The LTM Specialist is seeing a client source IP of 168.210.232.5 in the tcpdump. However, the client
source IP is actually 10.123.17.12.
Why does the IP address of 10.123.17.12 fail to appear in the tcpdump?

Why is there no record of port 1990 in the tcpdump?

Refer to the exhibit.
A company uses a complex piece of client software that connects to one or more virtual servers (VS)
hosted on an LTM device. The client software is experiencing issues. An LTM Specialist is tasked with
finding the cause of the problem.
The LTM Specialist has the tcpdump extract and knows the client software has at least one connection to a
VS on port 1990. However, when a tcpdump runs on the internal VLAN, there is no record of port 1990 in
the tcpdump.Why is there no record of port 1990 in the tcpdump?

What is causing the intermittent issues?

Refer to the exhibit.
An LTM Specialist has a virtual server set up on the LTM device as per the exhibit. The LTM Specialist
receives reports of intermittent issues. Some clients are connecting fine while others are failing to connect.
The LTM Specialist does a tcpdump on the relevant interfaces, with the following results extracted:
What is causing the intermittent issues?

What is the problem?

Refer to the exhibit.
A client attempts to connect from a Google Chrome browser to a virtual server on a BIG-IP LTM. The virtual
server is SSL Offloaded. When the client connects, the client receives an SSL error. After trying Mozilla
Firefox and Internet Explorer browsers, the client still receives the same errors.
The LTM Specialist does an ssldump on the virtual server and receives the results as per the exhibit.
What is the problem?

What is the problem?

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 168.210.232.500:25:07.598519 IP 168.210.232.5.33159 > 195.56.67.90.https: S 1920647964:1920647964(0) win 8192
<mss 1450,nop,nop,sackOK>
00:25:07.598537 IP 195.56.67.90.https > 168.210.232.5.33159: S 2690691360:2690691360(0) ack
1920647965 win 4350 <mss 1460,sackOK,eol>
00:25:07.598851 IP 168.210.232.5.33160 > 195.56.67.90.https: S 2763858764:2763858764(0) win 8192
<mss 1450,nop,nop,sackOK>
00:25:07.598858 IP 195.56.67.90.https > 168.210.232.5.33160: S 1905576176:1905576176(0) ack
2763858765 win 4350 <mss 1460,sackOK,eol>
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
<mss 1460,nop,wscale 0,sackOK,eol>
What is the problem?


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