What is the primary purpose of performing a packet capture when diagnosing a network-level performance issue?

To encrypt traffic so that performance issues are hidden from end users

To permanently resolve performance issues by automatically adjusting network configurations

To replace the need for monitoring tools by providing real-time performance metrics

To inspect the actual traffic flowing across the network and identify issues such as latency, packet loss, or throughput problems

Which scenario best illustrates the use of a packet capture to diagnose a network-level performance problem?

A firewall rule is blocking traffic, and the capture is used to modify the rule

A hard drive is failing, and the capture is used to check disk I/O performance

Users report slow application response times, and the capture shows excessive TCP retransmissions

A server log shows an application error, and the capture is used to view the error message

A packet capture on the BIG-IP shows a high number of TCP zero-window advertisements from the server. The BIG-IP performance graphs show normal CPU and memory. What does this indicate?

The server's receive buffer is full, indicating an application-level issue on the server.

The server is using a slow network link that cannot handle the data rate.

The network is congested, causing the server to advertise zero windows.

The BIG-IP is sending too much data too quickly for the server to process.

When troubleshooting a performance issue reported by clients, which capture point is most appropriate to determine if the problem is on the client side of the network?

On the server's network segment, close to the server

On the client's network segment, close to the client

On the BIG-IP system, on the management interface

On the BIG-IP system, on the internal VLAN

A performance issue occurs only during peak business hours. When should a packet capture be scheduled to best isolate the issue?

Immediately after the issue resolves

During off-peak hours when the issue is not occurring

At random times throughout the day

During the peak period when the issue is occurring

F5Certified Administrator, BIG-IP

Domain 2Objective 1

Identify When a Packet Capture Is Needed Within the Context of a Performance Issue F5CAB5 Practice Questions (Page 1)

Part of the Identify network level performance issues domain, which makes up ~19% of our current practice bank. F5 does not publish an official question count, but from its 30-minute exam (~10–20 total, ~2–4 in this domain), expect 1–1 from this objective — we provide 14 practice questions to prepare you well beyond it. (estimate)

14questions here

3free pages

5concepts

Questions 1–5

1foundation · easy
What is the primary purpose of performing a packet capture when diagnosing a network-level performance issue?
Select an answer first
2foundation · easy
Which scenario best illustrates the use of a packet capture to diagnose a network-level performance problem?
Select an answer first
3application · medium
A packet capture on the BIG-IP shows a high number of TCP zero-window advertisements from the server. The BIG-IP performance graphs show normal CPU and memory. What does this indicate?
Select an answer first
4foundation · easy
When troubleshooting a performance issue reported by clients, which capture point is most appropriate to determine if the problem is on the client side of the network?
Select an answer first
5foundation · easy
A performance issue occurs only during peak business hours. When should a packet capture be scheduled to best isolate the issue?
Select an answer first

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