F5CAB4 Practice Test 4 — 10 Questions

Question 1

An administrator needs to perform a massive configuration update. Which command should be used in TMSH to ensure the change is validated before application?

Accepted Answer

tmsh load sys config verify. Using the 'verify' option in TMSH allows the system to parse configuration changes and check for syntax or logical errors without actually applying them to the running configuration. This is essential for large updates because it prevents partial or broken configurations from being committed, which could lead to system instability, unintended traffic outages, or loss of management access, ensuring that updates are applied cleanly and safely.

Answer

tmsh save sys config

Answer

tmsh run util bash

Answer

tmsh edit sys config

Question 2

An administrator is preparing to upgrade the BIG-IP software on a device that is part of a high-availability pair. Before the upgrade, the administrator needs to ensure that the control plane configuration is backed up and can be restored if necessary. Which command should the administrator use to create a full configuration backup that includes both the configuration files and the license?

Accepted Answer

tmsh save sys ucs /var/local/ucs/backup.ucs. To create a full configuration backup on a BIG-IP, the administrator should use 'tmsh save sys ucs <filename>'. This command generates a UCS archive that contains the configuration, license, and other critical files. It is the standard method for backup and restore, especially before major changes like software upgrades. Other commands like 'save sys config' only save the running configuration to text files and do not include the license.

Answer

tmsh save sys config

Answer

tmsh backup sys config /var/local/backup.tgz

Answer

tmsh create sys backup

Question 3

An administrator is troubleshooting a BIG-IP device that is failing to synchronize configuration changes with its peer. The administrator runs 'tmsh show cm sync-status' and sees 'Changes Pending'. Which action should the administrator take first to identify the cause?

Accepted Answer

Run 'tmsh show cm device' to check the device group and trust status.. When synchronization fails with 'Changes Pending', the first step is to verify that the device is trusted and properly configured in the device group. The 'show cm device' command provides this information. If trust is broken or the device is not in the correct group, synchronization cannot occur. Once trust and group membership are confirmed, further troubleshooting can focus on specific configuration differences or network connectivity.

Answer

Run 'tmsh show sys mcp-state' to verify the mcpd daemon is running.

Answer

Run 'tmsh show cm sync-status' with the 'verbose' option to see detailed differences.

Answer

Run 'tmsh show sys config' to compare the running configuration with the saved configuration.

Question 4

Refer to the exhibit. What is the impact of changing this DB variable on the control plane?

Accepted Answer

It modifies internal system configuration parsing rules.. Modifying DB variables (also known as 'hidden' or advanced settings) directly affects the behavior of the BIG-IP system. In this case, enabling RFC3986 compliance for the configuration parser alters how the system handles certain characters. These settings are powerful tools in control plane administration for resolving edge-case issues, but they must be used carefully, as they can lead to unexpected behavior if not properly understood or documented.

Answer

It restarts the TMM process immediately.

Answer

It resets the system license to a trial state.

Answer

It upgrades the BIG-IP software version.

Question 5

An administrator needs to back up the current BIG-IP configuration to a UCS archive on the local device. Which command should the administrator use?

Accepted Answer

tmsh save sys ucs /var/local/ucs/backup.ucs. The correct command to create a UCS archive is 'tmsh save sys ucs <path>'. This command captures the entire configuration, including licenses and network settings, into a single file. It is the standard backup method for BIG-IP devices. Other commands either save only the running configuration or perform a restore, not a backup.

Answer

tmsh create sys ucs /var/local/ucs/backup.ucs

Answer

tmsh save sys config /var/local/ucs/backup.ucs

Answer

tmsh load sys ucs /var/local/ucs/backup.ucs

Question 6

An administrator needs to add a new VLAN to a BIG-IP device. They want to ensure that the change is saved to the configuration files immediately. Which sequence of TMSH commands should they use?

Accepted Answer

tmsh create net vlan vlan10 tag 10; tmsh save sys config. Creating a VLAN in TMSH modifies the running configuration. To make it persistent, the administrator must run 'save sys config', which writes the running configuration to the stored files. Creating a UCS archive does not update the stored configuration, and loading configuration would overwrite changes.

Answer

tmsh create net vlan vlan10 tag 10; tmsh load sys config

Answer

tmsh create net vlan vlan10 tag 10; tmsh save sys ucs

Answer

tmsh create net vlan vlan10 tag 10; tmsh save sys config all

Question 7

When modifying the control plane configuration, which action ensures that the changes persist after a system reboot?

Accepted Answer

tmsh save sys config. Changes made via TMSH are held in memory by mcpd until an explicit save command is issued. The 'save sys config' command writes the in-memory configuration to the /config/bigip.conf file on disk. Failing to perform this save operation will result in the loss of all configuration changes upon the next system reboot, which is a common error that can lead to catastrophic downtime if a device unexpectedly restarts.

Answer

tmsh reload sys config

Answer

tmsh commit sys config

Answer

exit

Question 8

An administrator is troubleshooting an issue where changes made through the BIG-IP Configuration utility (GUI) are not appearing in the tmsh configuration. The administrator suspects that the GUI and tmsh are using different configuration sources. Which statement correctly describes how the GUI and tmsh interact with the BIG-IP configuration?

Accepted Answer

Both the GUI and tmsh modify the configuration through the mcpd daemon, which updates the configuration files.. The GUI and tmsh are both front-ends to the same configuration management system, centered on the mcpd daemon. When a change is made in either interface, it is sent to mcpd, which updates the in-memory configuration and eventually writes it to the configuration files. This design ensures that changes made in one interface are reflected in the other, provided they are saved.

Answer

The GUI uses a proprietary protocol to communicate with the configuration, while tmsh uses SNMP.

Answer

The GUI writes directly to the bigip.conf file, while tmsh reads from a separate database.

Answer

tmsh reads the configuration from the bigip.conf file every time a command is entered, while the GUI caches settings in memory.

Question 9

Which file path contains the primary BIG-IP configuration file that the mcpd daemon loads at startup?

Accepted Answer

/config/bigip.conf. The BIG-IP configuration is stored in /config/bigip.conf. This file represents the system's defined state. During boot, mcpd parses this file and loads the configuration into memory. Understanding this location is fundamental for administrators, as it is the target for manual backups, configuration audits, and troubleshooting issues where the configuration fails to load or requires manual restoration from a known good state.

Answer

/var/tmp/bigip.conf

Answer

/etc/bigip.conf

Answer

/var/lib/bigip.conf

Question 10

Which utility should an administrator use to monitor real-time resource consumption on the BIG-IP control plane, specifically for identifying processes consuming high CPU?

Accepted Answer

top. The 'top' utility is a standard Linux command used to monitor system processes in real-time. Since the F5 BIG-IP control plane runs on a Linux-based OS, using standard Linux tools is a fundamental skill for administrators. This tool helps identify rogue or high-load processes that might be impacting the Configuration Utility or system responsiveness, which is vital for effective troubleshooting and maintaining overall system performance.

Answer

tmsh show sys performance

Answer

bigtop

Answer

tmsh show sys connection