F5 Networks F5CAB1 Exam Dumps

When a TMOS ISO file is transferred to /shared/images/, the BIG-IP automatically performs a validation step:

Checksum Verification

Before the image becomes visible in the GUI, the system verifies the internal checksum embedded inside the ISO.

This ensures:

The file was fully transferred

The image is not corrupted

It matches the official F5 release signature

Only after passing this verification does the GUI display the ISO under ''Available Images.''

Why the other options are incorrect:

A . Reboot into a new partition

No reboot occurs simply from uploading an image.

C . Copying into /var/local/images/

This directory is not used for ISO storage.

All valid images remain in /shared/images/.

Thus, the correct system action is checksum verification.

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.

Why the other options are incorrect:

A . Upgrade the active node first

Upgrading the active device requires removing it from service and failing over abruptly. This is not recommended and increases service disruption risk.

B . Resetting device trust

Resetting trust is unnecessary and can disrupt configuration sync, peer communication, and cluster operation. It is not part of any standard upgrade workflow.

D . Upgrading and rebooting both nodes simultaneously

This would cause total outage, because both HA members would be unavailable at the same time.

By default, management-plane traffic uses the management routing table, while data-plane traffic uses the TMM routing table.

Remote Syslog traffic is management-plane traffic unless a management route exists.

If no Management Route matches the Syslog server's destination IP, the BIG-IP will instead:

Use TMM routes, and

Source the packets from a Self IP

This is exactly what the administrator is observing.

To force Syslog traffic out the management port:

You must create a Management Route, which is configured using:

tmsh create /sys management-route <name> gateway <ip> network <syslog subnet>

This sends syslog traffic:

Out of the management interface

Using the Management IP as the source

Thus, Option B is correct.

Why the other options are incorrect:

A . Set the Management IP as the source address

Source address selection is overridden by routing.

Without a management route, traffic still goes out the data plane.

C . Create a new Self IP using a route domain

Unnecessary and not related to management-plane routing.

Syslog traffic should not rely on data-plane Self IPs.

D . Modify port lockdown on Self IP to allow UDP/514

This would allow Syslog traffic into the BIG-IP over a Self IP, not force outbound traffic via management.

The exhibit shows the configuration of a Self IP with:

Port Lockdown: Allow Custom

A Custom List that includes the following TCP ports:

443

22

Meaning of these ports:

TCP 443 HTTPS (TMUI --- web-based management)

TCP 22 SSH (command-line remote access)

No other TCP, UDP, or protocol entries are listed; therefore, only these two services are allowed to reach the BIG-IP via this Self IP.

Evaluating the answer choices:

Option Service Port Allowed?

FTP TCP 21 Not listed Not allowed

SSH TCP 22 Listed Allowed

Telnet TCP 23 Not listed Not allowed

Thus, SSH is the only traffic permitted through this Self IP configuration.

In BIG-IP, software images are installed on boot volumes (for example, HD1.1, HD1.2, HD1.3, etc.).

To install software on a new volume, the administrator must instruct the system to create a new boot location before installation.

There are two correct ways to create a new volume:

A . tmsh command (with correct syntax)

tmsh install software image /shared/images/BIGIP-<version>.iso volume HD1.5 create-volume

This syntax correctly includes:

install software image

full path to ISO (/shared/images/...)

volume name (HD1.5)

create-volume keyword

This instructs BIG-IP to create the new boot volume as part of the installation.

C . Using the GUI System > Disk Management

From the Disk Management menu, the administrator can:

Select ''New Volume''

Enter the volume identifier (e.g., HD1.5)

Apply changes

This GUI method is officially supported and explicitly creates a new boot volume before installing the software.

Why the other options are incorrect:

B . Incorrect tmsh syntax

Missing /shared/images/ path

Incorrect command structure

D . Incorrect command structure

Missing required keywords and correct command hierarchy

E . Software Management Install does NOT create volumes

This installs to an existing volume only

The GUI install dialog does not create new boot volumes

Thus, only Option A and Option C properly create a new software volume.