F5CAB1 Practice Test 8 — 10 Questions

Question 1

An administrator has just completed the initial configuration of a BIG-IP appliance and needs to verify that the management interface is reachable from the corporate network. The administrator is on a workstation that can ping the management IP. Which command should the administrator run on the BIG-IP to confirm that the default gateway is correctly configured?

Choose an answer to begin — your selection is scored in the full session.

Accepted Answer

tmsh list sys management-route. To verify the default gateway on the management interface, the administrator should list the management routes. The command 'tmsh list sys management-route' displays the configured routes, including the default route and its gateway. This confirms that the gateway is set correctly. Other commands like showing the management IP or global settings do not provide the gateway information. Checking interface status is unrelated to gateway configuration.

Answer

tmsh show net interface

Answer

tmsh show sys management-ip

Answer

tmsh show sys global-settings

Question 2

A network engineer is preparing a new BIG-IP appliance for installation in a data center. The rack has both 120V and 208V power available. The engineer wants to ensure the device powers on correctly and is not damaged. Which power consideration should the engineer follow?

Accepted Answer

Verify the appliance's power supply rating and connect it to the appropriate voltage source as specified in the platform's hardware guide.. The correct approach is to verify the appliance's power requirements in the hardware guide before connecting power. BIG-IP platforms have varying power specifications, and using the wrong voltage or cord can damage the device or cause it to fail. Proper site preparation includes confirming power and environmental requirements to ensure a successful installation.

Answer

Connect the appliance only to a 120V outlet, because all BIG-IP appliances are designed exclusively for 120V.

Answer

Use a standard 120V computer power cord for all BIG-IP appliances, regardless of the model, because the power supplies auto-sense voltage.

Answer

Connect the appliance to a 208V outlet without checking the hardware guide, because higher voltage always improves performance.

Question 3

A network administrator is upgrading a BIG-IP from version 15.1 to 17.1 using the default upgrade process. After the upgrade, the administrator notices that the configuration from the previous version is not fully loaded and some objects are missing. The administrator checks the upgrade logs and sees a message about a configuration conversion failure. What is the most likely cause?

Accepted Answer

The configuration contains objects or features that are deprecated or unsupported in the new version, causing the conversion to fail.. Configuration conversion failures during upgrades are typically caused by deprecated or unsupported objects in the new version. The BIG-IP upgrade process automatically converts the configuration, but if an object cannot be converted, it is skipped and an error is logged. The administrator must review the logs to identify the problematic objects and manually update or remove them. This ensures a clean configuration load.

Answer

The administrator did not run the 'tmsh save sys config' command before the upgrade, so the configuration was not saved to the new version.

Answer

The upgrade was performed without first installing the latest hotfix for the current version, leading to an incompatible upgrade path.

Answer

The upgrade process requires a manual re-import of the configuration using 'tmsh load sys config' from a backup.

Question 4

A network administrator is setting up a new BIG-IP appliance and needs to license it using the automatic licensing method. The administrator has configured the management IP and default gateway. Which additional configuration is required for automatic licensing to succeed?

Accepted Answer

Configure DNS servers on the BIG-IP.. For automatic licensing to work, the BIG-IP must be able to reach the F5 licensing server. This requires the management interface to have internet connectivity and, crucially, DNS resolution. The BIG-IP uses DNS to resolve the licensing server's hostname. Without DNS configured, the licensing process cannot locate the server, and the license activation will fail. While NTP, proxy, and static routes can be relevant in specific network setups, they are not universally required for automatic licensing.

Answer

Configure a proxy server for licensing traffic.

Answer

Configure NTP servers on the BIG-IP.

Answer

Configure the BIG-IP to use a static route for the licensing server.

Question 5

An administrator is preparing to install a new BIG-IP appliance in a data center where the management network does not have a DHCP server. The administrator connects to the console and completes the initial configuration. Which action must be taken to ensure the BIG-IP is reachable on the management network after the initial setup?

Accepted Answer

Assign a management IP address, netmask, and default gateway using the console configuration utility or tmsh.. In a network without DHCP, the management interface must be manually configured with a static IP address, netmask, and default gateway. This is accomplished during the initial console setup or later via tmsh. Without this step, the BIG-IP cannot be reached on the management network, preventing remote administration and further configuration.

Answer

Enable the DHCP client on the management interface with a static fallback address.

Answer

Create a VLAN group that includes the management interface and assign an IP address to it.

Answer

Configure a self IP on the management VLAN using the tmsh command create net self.

Question 6

What is the main advantage of using a UCS file for configuration management?

Accepted Answer

It contains the entire configuration including keys and certs.. A UCS file provides an all-in-one archive of the BIG-IP system configuration, including certificates, keys, and license files. This portability is the cornerstone of F5 configuration management, allowing administrators to migrate configurations between different hardware or virtual environments with ease. It is the gold standard for backups, ensuring that the entire state of the system can be recovered accurately during disaster recovery scenarios.

Answer

It allows for real-time configuration synchronization.

Answer

It compresses the log files for faster uploading.

Answer

It enables auto-update of the BIG-IP firmware.

Question 7

A network administrator is installing a new BIG-IP appliance and needs to license it. The administrator has a base registration key and wants to activate the license online. Which step is required to complete the license activation?

Accepted Answer

Configure the management interface with a valid IP address and DNS settings to allow outbound HTTPS access to F5.. Online license activation requires the BIG-IP management interface to have network connectivity to F5's licensing servers. This means a valid IP address, gateway, and DNS must be configured. Once connectivity is established, the administrator can enter the base registration key and the BIG-IP will automatically retrieve and install the license.

Answer

Access the F5 licensing portal and manually generate a license file, then upload it to the BIG-IP.

Answer

Disable the default firewall rules to allow licensing traffic on port 80.

Answer

Install a license server on the internal network and point the BIG-IP to it.

Question 8

An administrator is preparing to install a new BIG-IP virtual edition (VE) license using the command line interface. Which TWO files or parameters are strictly required to complete a manual activation when the device lacks direct internet access? (Choose two.)

Accepted Answer

The unique Dossier generated from the unactivated BIG-IP VE instance.. Manual licensing of a BIG-IP VE offline requires generating a dossier from the device and submitting it to the F5 licensing portal to receive the signed license file. Providing the exact dossier string and subsequently installing the returned license file completes the activation process securely without requiring outbound internet connectivity from the management network.

Answer

The root administrator password hash exported from the configuration utility.

Answer

The enterprise registration key provided in the F5 software purchase order email.

Answer

The private SSL certificate used for securing administrative web management traffic.

Question 9

An administrator is upgrading a BIG-IP from version 14.1 to 17.1. The administrator wants to ensure that the upgrade does not fail due to insufficient disk space. Which command should be used to check the available disk space on the BIG-IP before the upgrade?

Accepted Answer

df -h. Before upgrading a BIG-IP, it is critical to verify sufficient disk space. The 'df -h' command, run from the bash shell, provides a clear view of available space on all file systems. If any partition is nearly full, the upgrade may fail. The administrator should ensure there is enough free space, typically by removing old software images or log files. This command is the standard way to check disk usage on Linux-based systems like TMOS.

Answer

show /system disk-usage

Answer

tmsh show sys disk

Answer

ls -l /var/log

Question 10

What is the purpose of the 'Active' status in the BIG-IP software volume table?

Accepted Answer

It identifies the partition currently running the system.. The 'Active' status indicates which partition is currently running the operating system. Knowing how to identify the active volume is essential because all software installations must be performed on the 'inactive' volume to ensure traffic is not interrupted. This fundamental understanding prevents accidental service outages by ensuring the administrator never installs software directly onto the partition that is currently managing production traffic.

Answer

It identifies the partition with the latest updates.

Answer

It shows which partition is currently syncing.

Answer

It indicates the volume where logs are stored.