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F5 F5CAB1 Exam Syllabus Topics:

Topic	Details
Topic 1	BIG IP Administration Data Plane Configuration: This section of the exam measures skills of System Administrators and covers configuring BIG IP objects that control data plane behavior. It focuses on setting up virtual servers, pools, nodes, monitors, and profiles so that applications are delivered reliably and efficiently according to design requirements.
Topic 2	BIG IP Administration Install Initial Configuration and Upgrade: This section of the exam measures skills of System Administrators and covers the lifecycle tasks for deploying and maintaining a BIG IP system. It includes installing the platform, performing initial setup, applying licenses, configuring basic networking, and planning and executing software upgrades and hotfixes.
Topic 3	BIG IP Administration Control Plane Administration: This section of the exam measures skills of System Administrators and covers managing the control plane where BIG IP is configured and administered. It includes working with user accounts, roles, device settings, configuration management, and using the graphical interface and command line for daily administrative tasks.
Topic 4	BIG IP Administration Data Plane Concepts: This section of the exam measures skills of Network Administrators and covers how BIG IP handles application traffic on the data plane. It includes understanding flow of traffic, key data path components, basic concepts of load balancing, and how security and performance features affect user traffic.
Topic 5	BIG IP Administration Support and Troubleshooting: This section of the exam measures skills of Network Administrators and covers identifying and resolving common issues that affect BIG IP operation. It focuses on using logs, statistics, diagnostic tools, and basic troubleshooting methods to restore normal traffic flow and maintain stable application delivery.

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F5 BIG-IP Administration Install, Initial Configuration, and Upgrade Sample Questions (Q25-Q30):

NEW QUESTION # 25
How should a BIG-IP Administrator check theprovisioned CPU percentfor a module?
(Choose two.)

A. By runningtmsh show /sys cpuand reviewing the specific module provisioned output.
B. By runningtmsh show /sys provisionand reviewing the specific module in the output.
C. By checking theDashboardoutput in the Statistics tab in the GUI.
D. By running thetopcommand and reviewing the output for the provisioned module.
E. By going toSystem / Resource Provisioningand hovering over the CPU section colors.

Answer: B,E

Explanation:
BIG-IP allocates CPU and memory resources based on module provisioning levels.
To view how much CPU a module is assigned, administrators must check provisioning information from:
C). GUI - System Resource Provisioning
This page visually displays CPU allocation via color-coded bars.
Hovering over the CPU bar shows:
* CPU usage percent per module
* Which modules share CPU cycles
* The system's total resource allocation
This is the primary GUI method.
D). tmsh show /sys provision
This command displays detailed module provisioning information including:
* Provisioned modules
* Their provisioning level
* CPU and memory allocation data
It is the authoritative CLI method for resource provisioning status.
Why the other options are incorrect:
A). top
* Shows real-time process usage, notprovisionedCPU allocation.
B). tmsh show /sys cpu
* Displays CPU runtime utilization, not per-module provisioning.
E). Statistics Dashboard
* Only shows traffic / system runtime metrics, not provisioning resource allocations.
Therefore,C and Dare correct.

NEW QUESTION # 26
The Configuration Utility of a BIG-IP device is currently accessible via its management IP10.53.1.245from all VLANs.
The BIG-IP Administrator needs to restrict access so only hosts from the10.0.0.0/24subnet can access the Configuration Utility.
Which TMSH command accomplishes this?

A. (tmos)# modify /ltm httpd allow replace-all-with {10.0.0.0/24}
B. (tmos)# modify /sys httpd allow replace-all-with {10.0.0.0/24}
C. (tmos)# create /net acl MGMT.HTTP rule add { (permit tcp 10.0.0.0/24 10.53.1.245 http) (deny ip any any http) }
D. (tmos)# create /net acl MGMT.HTTP rule add { (permit tcp 10.0.0.0 0.0.0.255 host 10.53.1.245 http) }

Answer: B

Explanation:
BIG-IP controls access to the web-based Configuration Utility (TMUI) through the/sys httpd allowlist. This parameter specifies which client IPs or subnets may initiate HTTP/HTTPS connections to the management interface.
To restrict TMUI access toonlythe 10.0.0.0/24 subnet:
* The correct method is tomodify the HTTPD allow listso that it contains only this subnet.
* This requires replacing the entire current list with the new subnet using:
modify /sys httpd allow replace-all-with {10.0.0.0/24}
This ensures thatonlyclients within 10.0.0.0/24 can reach the Configuration Utility.
Why the other options are incorrect:
* Options A and Ccreate network ACL objects under /net acl, which apply to data-plane traffic, not management-plane TMUI access. TMUI access is not controlled by LTM ACLs but by the HTTPD allow directive.
* Option Bis incorrect syntax and references /ltm httpd, which is not the proper object; the correct hierarchy is /sys httpd.
Thus, only modifying the/sys httpd allowlist achieves the required restriction.

NEW QUESTION # 27
The BIG-IP Administrator needs to update access to the Configuration Utility to include the 172.28.31.0/24 and 172.28.65.0/24 networks.
From the TMOS Shell (tmsh), which command should the BIG-IP Administrator use to complete this task?

A. modify /sys httpd allow add { 172.28.31.0/255.255.255.0 172.28.65.0/255.255.255.0 }
B. modify /sys httpd allow add { 172.28.31.0 172.28.65.0 }
C. modify /sys httpd permit add { 172.28.31.0/255.255.255.0 172.28.65.0/255.255.255.0 }

Answer: A

Explanation:
Access to the BIG-IP Configuration Utility (TMUI) is controlled through the /sys httpd allow list.
This list defines which IP addresses or subnets are allowed to connect to the management web interface.
To allow two new subnets- 172.28.31.0/24 and 172.28.65.0/24 -the administrator must add both subnets to the existing list without removing current entries.
In tmsh, subnet entries must be specified in network/netmask format , for example:
172.28.31.0/255.255.255.0
The correct tmsh command to append these networks is:
modify /sys httpd allow add { 172.28.31.0/255.255.255.0 172.28.65.0/255.255.255.0 } Why the other options are incorrect:
Option B:
* IPs are listed without masks, which is invalid for subnet-based access control.
* The system requires network/netmask format.
Option C:
* The command uses permit instead of allow, which is not a valid attribute of /sys httpd.
* The correct keyword must be allow .
Thus, only Option A correctly adds both permitted subnets in the proper tmsh format.

NEW QUESTION # 28
A BIG-IP Administrator upgrades the BIG-IP LTM to a newer software version. After the administrator reboots into the new volume, the configuration fails to load.
Why is the configuration failing to load?

A. The license needed to be reactivated before the upgrade.
B. A minimum of at least two reboots is required.
C. The upgrade was performed on the standby unit.
D. Connectivity to the DNS server failed to be established.

Answer: A

Explanation:
When upgrading to a newer TMOS software version, BIG-IP validates whether the current license is permitted to run that version.
This is controlled by theService Check Datein the device's license file.
If the Service Check Date is older than the minimum required for the target version:
* The systemboots into the new volume,
* Butfails to load the configuration,
* And will instead present messages indicating that the configuration cannot be applied due to aninvalid or outdated license.
This is a well-known behavior:
An outdated license, not reactivated before upgrade, causes configuration load failure after reboot into the new software.
Why the other options are incorrect:
A). Performed on the standby unit
* Upgrading a standby unit does not cause configuration load failure.
* Standby-only upgrades are standard best practice.
C). Two reboots required
* BIG-IP does not require two reboots during an upgrade.
* One reboot into the new volume is sufficient.
D). DNS connectivity failure
* DNS connectivity does not affect configuration loading.
* DNS is only needed for automatic license activation, not for applying config at boot.
Thus, the configuration failed to load because thelicense was not reactivated before the upgrade, making Option Bcorrect.

NEW QUESTION # 29
The monitoring team reports that the SNMP server is unable to poll data from a BIG-IP device.

What information will help the BIG-IP Administrator determine whether the issue originates from the BIG-IP system?

A. The "Traffic Group" setting must use a floating Traffic Group.
B. The "Port Lockdown" setting is preventing the SNMP server from polling data from the BIG-IP.
C. The "VLAN / Tunnel" setting must allow All Vlans.
D. The configuration on the exhibit is correct and other options should be explored.

Answer: B

Explanation:
The exhibit shows a Self IP with:
VLAN: Data
Port Lockdown: Allow None
Impact of "Allow None" on SNMP
When a Self IP is configured with:
Port Lockdown: Allow None
the BIG-IP blocks all services and ports except a few hardcoded HA communication ports.
This means:
UDP/161 (SNMP) is blocked
UDP/162 (SNMP traps) is blocked
The SNMP server cannot poll or receive data from the BIG-IP through this Self IP SNMP relies on access through the Self IP if out-of-band (mgmt interface) is not used.
Thus, the issue is directly caused by Port Lockdown = Allow None, which prevents SNMP communication.

NEW QUESTION # 30
......

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