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| Certification Vendor: | F5 Networks |
|---|---|
| Exam Name: | BIG-IP Administration: Install, Initial Configuration, and Upgrade |
| Exam Number: | F5CAB1 |
| Exam Duration: | 120 minutes |
| Passing Score: | 70% |
| Certificate Validity Period: | 2 years |
| Related Certifications: | F5 Certified Technology Specialist, BIG-IP Admin (F5CTS-BIG-IP-Admin) |
| Real Exam Qty: | 76 |
| Exam Format: | Multiple choice, Multiple select, True/False, Scenario-based |
| Available Languages: | English |
| Exam Price: | $50 USD |
| Sample Questions: | F5 F5CAB1 Sample Questions |
| Exam Way: | Online proctored or in-person at Pearson VUE testing centers |
| Pre Condition: | No formal prerequisites, but basic networking knowledge and familiarity with F5 BIG-IP platform is recommended |
| Official Syllabus URL: | https://www.f5.com/learn/certification/f5cab1 |
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NEW QUESTION # 15
When using the tmsh shell of a BIG-IP system, which command will display the management-ip address?
Answer: C
Explanation:
Within the BIG-IP Traffic Management Shell (tmsh), system configuration objects-including the management IP-are organized under the /sys hierarchy. The management IP address is a configurable property stored in the system configuration and can be viewed using the tmsh list command, which displays configuration objects and their currently assigned values.
Why "list /sys management-ip" is correct
* The list command in tmsh is used to display configured system values , not runtime statistics.
* The object that holds the management IP settings on BIG-IP systems is located at: /sys management-ip
* Running the command: list /sys management-ip will reveal the settings for the management IP interface, including the address, netmask, and any associated attributes.
* This is the standard method used during system setup and verification to confirm the management IP configuration.
This behavior aligns with BIG-IP administration procedures, where configuration information is retrieved using list , while operational data is retrieved using show .
Why the other options are incorrect
A). run /util bash ifconfig mgmt
* This command enters the Bash shell, then runs ifconfig to display the management interface.
* While this can show the management interface address, it is not a tmsh-native command , and the question specifically asks for a tmsh command.
* Administrators use tmsh directly for configuration display rather than leaving the shell.
C). show /sys management-ip
* The show command displays statistics or operational data , not configuration values.
* The management-ip object does not maintain statistics; therefore show does not return the configuration details required.
* Only the list command reveals stored configuration data such as IP address and netmask.
NEW QUESTION # 16
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?
Answer: B
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 }
NEW QUESTION # 17
What should you do before performing a software upgrade on BIG-IP?
Answer: A
Explanation:
It's crucial to back up the system configuration before upgrading to ensure you can restore the system if the upgrade fails.
NEW QUESTION # 18
A BIG-IP Administrator is responsible for deploying a new software image on an F5 BIG-IP HA pair and has scheduled a one-hour maintenance window. With a focus on minimizing service disruption, which of the following strategies is the most appropriate?
Answer: B
Explanation:
For BIG-IP high-availability (HA) pairs, F5's recommended upgrade workflow prioritizes service continuity, predictable failover, and minimal downtime. The established best-practice sequence is:
Upgrade the standby unit first
Because the standby device is not passing traffic, upgrading and rebooting it does not impact production.
Boot the standby unit into the newly installed version
Once online, the administrator verifies basic health, device sync status, cluster communication, and module functionality.
Perform a controlled failover to the upgraded unit
Traffic shifts to the newly upgraded device, allowing validation of the configuration and operational behavior under real traffic loads.
Upgrade the second device (now standby)
The previously active device becomes standby after failover, allowing it to be safely upgraded and rebooted without interruption.
This phased approach ensures only one device is unavailable at a time, allowing continuous traffic flow throughout the upgrade process.
Why the Correct Answer is C
Option C exactly matches F5's documented production-safe upgrade method:
Upgrade the standby node first
Reboot into new image
Failover to upgraded device
Validate
Upgrade the remaining (now-standby) device
This procedure minimizes risk and traffic disruption.
NEW QUESTION # 19
A secondary administrator has been granted access to a BIG-IP device through itsManagement Interface, but is unable to access theConfiguration Utility (WebUI).
What command can be run from the CLI to capture the network traffic on themanagement interfaceand troubleshoot the issue?
(Choose two.)
Answer: B,E
Explanation:
The BIG-IP has two distinct planes:
* Management-plane# handled entirely by the management interface (MGMT)
* Data-plane (TMM)# handles Self IPs, VLAN interfaces, and traffic processing To capture traffic on the management interface, only the management-side NICs may be used:
* mgmt# Logical name for the management interface
* eth0# Physical Linux interface mapped to the management port on most BIG-IP platforms Both of these correctly capture inbound/outbound WebUI (HTTPS/443) traffic on the management port.
Why the correct answers are A and B
A). tcpdump -i eth0 -n port 443
* On BIG-IP appliances and VMs, the management port maps toeth0at the Linux OS level.
* Capturing on eth0 correctly shows HTTPS traffic to the WebUI.
B). tcpdump -i mgmt -n port 443
* mgmtis the BIG-IP alias for the management interface.
* This is thepreferredand most explicit capture interface for management-plane packet captures.
Why the other options are incorrect:
C). tcpdump -i 0.0
* Interface0.0is the TMM switch interface used for data-plane packet captures.
* Itdoes NOTcapture management-plane traffic.
D). tcpdump -i tun0
* Used for tunnel interfaces (IPsec, VXLAN, etc.)
* Not related to management access.
E). tcpdump -i management
* There isnointerface named management on BIG-IP.
* The correct names are mgmt or eth0.
NEW QUESTION # 20
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