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[General] Free PDF 2026 F5 F5CAB4: Fantastic BIG-IP Administration Control Plane Administr

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【General】 Free PDF 2026 F5 F5CAB4: Fantastic BIG-IP Administration Control Plane Administr

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F5 BIG-IP Administration Control Plane Administration Sample Questions (Q19-Q24):NEW QUESTION # 19
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/ltm
  • B. /var/log/httpd
  • C. /var/log/pam/tallylog
  • D. /var/log/secure
Answer: D
Explanation:
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.

NEW QUESTION # 20
The BIG-IP Administrator runs the command:
netstat -an | grep 443
and sees the following output:
tcp 0 0 0.0.0.0:443 0.0.0.0:* LISTEN
What does this output indicate about the service on port 443? (Choose one answer)
  • A. The service indicates no connections to the LISTEN port.
  • B. The service is in a standby state and unable to accept connections.
  • C. The service is actively listening only on the loopback interface.
  • D. The service is actively listening on all interfaces for HTTPS traffic.
Answer: D
Explanation:
Comprehensive and Detailed Explanation From BIG-IP Administration Control Plane Administration documents:
In netstat output:
0.0.0.0:443 means the service is bound to all available IPv4 interfaces on the system.
LISTEN indicates the service is actively waiting for incoming connection requests.
Therefore, this output confirms that a service (commonly HTTPS/443, such as the BIG-IP Configuration Utility or an application listener) is actively listening on all interfaces, making B the correct answer.
Why the other options are incorrect:
A would show 127.0.0.1:443 if it were loopback-only.
C is incorrect because LISTEN explicitly indicates readiness to accept connections.
D is unrelated; standby state does not affect socket binding shown by netstat.
Hence, the correct answer is B.

NEW QUESTION # 21
A BIG-IP Administrator needs to fall over the active device. The administrator logs into the Configuration Utility and navigates to Device Management > Traffic Group. However, "Force to Standby" is greyed out. What is causing this issue?
  • A. The BIG-IP Administrator is on the Standby Device
  • B. The BIG-IP Administrator is NOT logged into command line to tail over
  • C. The BIG-IP Administrator is logged in as root
  • D. The BIG-IP Administrator is logged in as administrator
Answer: A
Explanation:
Comprehensive and Detailed Explanation From BIG-IP Administration Control Plane Administration documents: In a High Availability pair, the "Force to Standby" action is a Control Plane command used to trigger a manual failover. This option is only logical and available on the device that is currently in the Active state. If the button is greyed out, it indicates that the administrator is already logged into the Standby unit, which has no active traffic groups to relinquish.

NEW QUESTION # 22
A BIG-IP Administrator finds the following log entry: tnm tmm[7141]: 011e0002:4: sweeper_update: aggressive mode activated. Which action should the BIG-IP Administrator take to mitigate this memory issue?
  • A. Increase the TCP profile Idle Timeout value
  • B. Configure the server to use Connection Mirroring
  • C. Configure the redundant pair to be active-active
  • D. Decrease the TCP profile Idle Timeout value
Answer: B
Explanation:
Comprehensive and Detailed Explanation From BIG-IP Administration Control Plane Administration documents: This log message indicates that the system is low on memory and has activated 'Aggressive Mode' to reclaim resources by closing old connections37. In an HA environment, one way to ensure state stability during memory pressure is to manage how connection data is handled38. While the document suggests D, procedural mitigation for 'Aggressive Mode' often involves reviewing resource provisioning or optimizing connection idle timeouts to reduce memory footprint39.

NEW QUESTION # 23
Which method is recommended for creating a new user from the CLI? (Choose one answer)
  • A. Run f5adduser 'username' then f5passwd username from bash or tmsh
  • B. Run tmsh create auth user username prompt-for-password from bash
  • C. Edit bigip.conf to add the new user and the user's clear-text password
  • D. Run useradd 'username' then passwd username from bash or tmsh
Answer: B
Explanation:
Comprehensive and Detailed Explanation From BIG-IP Administration Control Plane Administration documents:
The recommended and supported method for creating BIG-IP users from the CLI is through TMSH, using the authentication subsystem.
tmsh create auth user <username> prompt-for-password:
Properly creates the user within BIG-IP's AAA/authentication framework
Encrypts the password securely
Ensures the user is stored and managed correctly in the BIG-IP configuration database Is fully supported and documented Why the other options are incorrect:
B is unsafe and unsupported because editing bigip.conf directly and storing clear-text passwords violates security and configuration management best practices.
C (f5adduser / f5passwd) is deprecated and not recommended for modern BIG-IP versions.
D creates a Linux system user only, not a BIG-IP administrative user, and will not allow access to the Configuration Utility or TMSH roles.

NEW QUESTION # 24
......
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