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F5CAB4 Exam
F5.F5CAB4.v2026-06-15.q69 Dumps

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Question 41

A BIG-IP Administrator needs to update the list of configured NTP servers. In which area of the Configuration Utility should the BIG-IP Administrator perform this update?

A.System > Configuration
B.System > Services
C.System > Preferences
D.System > Platform

Correct Answer: A

NTP (Network Time Protocol) is vital for management connectivity and HA state synchronization. Correct time is required for log timestamping and device trust group communication46. To manage these settings, the administrator navigates to System > Configuration, where general system-level services like NTP and DNS are defined to ensure the Control Plane remains synchronized with the network environment.

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Question 42

Which log file should the BIG-IP Administrator check to determine if a specific user tried to log in to the BIG-IP Configuration Utility? (Choose one answer)

A./var/log/pam/tallylog
B./var/log/secure
C./var/log/ltm
D./var/log/httpd

Correct Answer: B

Comprehensive and Detailed Explanation From BIG-IP Administration Control Plane Administration documents:
On BIG-IP systems, all authentication attempts for administrative access-including logins to the Configuration Utility (GUI)-are logged in /var/log/secure. This log file records:
Successful and failed login attempts
The username used
The authentication method (local, LDAP, RADIUS, etc.)
Access denials and PAM authentication errors
Why the other options are incorrect:
/var/log/pam/tallylog tracks account lockouts and failed attempt counters, not detailed login attempts.
/var/log/ltm logs traffic management events, not administrative authentication.
/var/log/httpd logs web server activity but does not record authentication success or failure for BIG-IP administrative users.
Therefore, the correct log file to verify whether a user attempted to log in to the BIG-IP Configuration Utility is /var/log/secure.

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Question 43

A node is a member of various pools and hosts different web applications. If a web application is unavailable, the BIG-IP appliance needs to mark the pool member down for that application pool.
What should a BIG-IP Administrator deploy at the pool level to accomplish this?

A.A combination of ICMP + TCP monitor
B.A TCP monitor with a custom interval/timeout
C.A UDP monitor with a custom interval/timeout
D.An HTTP monitor with custom send/receive strings

Correct Answer: D

To accurately report the current status of specific web applications hosted on the same server (node), the Control Plane must use a monitor that operates at the application layer.
Application-Specific Monitoring: While a node (the IP address) might be up and responding to ICMP (ping) or TCP handshakes, a specific web service or path on that server could be failing.
Custom Send Strings: An HTTP monitor allows the administrator to define a "Send String" to request a specific page or URI related to the application in that pool .
Receive Strings: The "Receive String" identifies a unique value that the application must return to be considered "Available" .
Granular Status Reporting: By deploying these monitors at the pool level, the Control Plane can mark a pool member "Offline" for one application pool if the receive string is missing, while keeping it "Available" in another pool where the service is still healthy.

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Question 44

The BIG-IP Administrator has to investigate an issue with an HTTP virtual server. Which log file should be checked first?

A./var/log/messages
B./var/log/audit
C./var/log/httpd/httpd_errors
D./var/log/ltm

Correct Answer: D

For an issue involving an HTTP virtual server, the first log file to check is /var/log/ltm . A BIG-IP virtual server is an LTM traffic-management object, and runtime events related to virtual servers, pools, pool members, monitors, availability changes, and traffic-management behavior are normally written to the LTM log. /var/log/httpd/httpd_errors is not the correct first choice because it relates to the BIG-IP Configuration Utility web service, not to an HTTP application virtual server processing client traffic. /var/log/audit records administrative configuration changes, such as who modified an object and when. /var/log/messages contains broader system-level messages but is not the primary LTM troubleshooting log. Therefore, when the problem statement specifically says an HTTP virtual server is having an issue, the control-plane troubleshooting path starts with /var/log/ltm .
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Question 45

Where are system logs typically stored?

A./config
B./var/log
C./usr/bin
D./home

Correct Answer: B

BIG-IP stores logs in the /var/log directory.

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