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Author: tysmith345    Time: 22 hour before
Title: Exam F5CAB1 Quick Prep & Reliable F5CAB1 Test Practice
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F5 BIG-IP Administration Install, Initial Configuration, and Upgrade Sample Questions (Q13-Q18):NEW QUESTION # 13
In order to configure allowed IP addresses forSSH accessto a BIG-IP device, the BIG-IP Administrator has issued the commands shown in the exhibit.

Which IP addresses will have SSH access after issuing the shown commands?
(Choose two.)
Answer: A,E
Explanation:
From the exhibit, the administrator performs the following actions:
* Displays the current SSH allow configuration:
tmsh list sys sshd allow
allow { ALL }
* Replaces the existing SSH allow list with a specific subnet:
tmsh modify sys sshd allow replace-all-with { 10.0.0.0/24 }
* Confirms the updated configuration:
tmsh list sys sshd allow
allow { 10.0.0.0/24 }
This configuration restricts SSH access to only hosts that fall within the10.0.0.0/24network.
Evaluation of the options
A). 10.0.0.100
This address is within the 10.0.0.0/24 subnet and is a valid host address, so SSH access is permitted.
B). 10.0.0.254
This address is also within the 10.0.0.0/24 subnet and is a valid host address, so SSH access is permitted.
C). 10.0.0.256
This is not a valid IP address because an IPv4 octet cannot exceed 255.
D). 100.0.1.10
This address is outside the configured 10.0.0.0/24 subnet and will not be allowed.
E). 100.0.0.10
This address is also outside the configured subnet and will not be allowed.

NEW QUESTION # 14
Given thatBIGIP-<version>.isoandHotfix-BIGIP-<version>-ENG.isohave been uploaded to/shared/images on an F5 device, what is the appropriatetmshcommand to prepare and update the BIG-IP device with the hotfixof a software version on anew volume HD1.2?
(Choose one.)
Answer: C
Explanation:
When installing a BIG-IP software versionwith a HotFixon anew boot volume, F5 requires that both thebase TMOS imageand theHotFix imagebe installed together as part of the same installation workflow.
The correct process is:
* Specify thebase TMOS ISO
* Specify theHotFix ISOthat corresponds to that base version
* Instruct the system tocreate a new boot volume
* Install both images into that new volume
This is achieved with the following tmsh syntax:
tmsh install /sys software BIGIP-<version>.iso hotfix Hotfix-BIGIP-<version>-ENG.iso create-volume HD1.2 This command:
* Installs the base image first
* Applies the HotFix on top of the base image
* Creates and installs everything onHD1.2
* Leaves the currently active volume untouched for rollback
Why the other options are incorrect
A). Installing only the hotfix
A HotFix cannot be installed by itself on a new volume. A base image must already be present.
C). Using create instead of install
The create keyword is not valid for software installation operations.
D). Using copy
The copy command does not install software images or hotfixes.

NEW QUESTION # 15
How can the BIG-IP Administrator tell when anunlicensed modulehas been provisioned?
Answer: C
Explanation:
The BIG-IP system has built-in licensing enforcement.
If an administrator provisions a module that the device isnot licensedto run, the system will still allow the provisioning action to occurinitially, but the system detects the mismatch and displays an alert.
What actually happens:
* The GUI places awarning bannerin theupper-left cornerlabeled something similar to:"rovisioning Warning"
* This appears immediately after provisioning a module that is not included in the active license.
* The system remains in an "inconsistent state" until the module is disabled again or the license is updated.
This is the visual cue BIG-IP uses to indicate that a module was provisioned without valid licensing.
Why the other options are incorrect:
A). "A BIG-IP does not allow unlicensed modules to be provisioned."
* Not true. BIG-IPdoesallow provisioning, but warns afterward.
B). "A warning will appear when provisioning an unlicensed module."
* The warning doesnotappear during the provisioning step itself.
* It appearsafter provisioning, in the main GUI, as a system banner.

NEW QUESTION # 16
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?
Answer: D
Explanation:
The exhibit shows aSelf IPwith:
* VLANata
* Port Lockdown:Allow None
Impact of "Allow None" on SNMP
When a Self IP is configured with:
Port Lockdown: Allow None
the BIG-IP blocksallservices 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 byPort Lockdown = Allow None, which prevents SNMP communication.
Why the other options are incorrect:
B). Traffic Group must use a floating Traffic Group
* SNMP polling doesnotrequire floating Self IPs.
* Floating groups apply to HA failover IPs, not SNMP functionality.
C). VLAN/Tunnel must allow All VLANs
* Self IPs are always bound to a VLAN; SNMP doesnotrequire All VLANs.
* As long as the Self IP belongs to a reachable VLAN, SNMP can work.
D). Configuration is correct
* It is not correct:Allow Noneblocks SNMP and is the problem.

NEW QUESTION # 17
The Port Lockdown feature prevents unwanted connection attempts to a Self IP.
Which three types of connection attempts areunaffectedby Port Lockdown settings?
Answer: C
Explanation:
Port Lockdown controls which ports and protocols aSelf IPwill respond to.
However, certain traffic types bypass Port Lockdown for BIG-IP functionality and routing integrity.
The three types that areNOT affectedby Port Lockdown are:
1. Defined Virtual Server Traffic
Traffic destined to a Self IP that matches aconfigured virtual serveris always accepted by the BIG-IP, regardless of Port Lockdown settings.
This ensures that traffic processing does not break when administrators restrict Self-IP ports.
2. ICMP (Internet Control Message Protocol)
ICMP (such as ping, traceroute responses, etc.) always passes through a Self IP even when Port Lockdown is set to:
* Allow Default
* Allow None
* Allow Custom
F5 allows ICMP for reachability and diagnostic purposes independent of Port Lockdown rules.
3. Centralized Management Infrastructure (CMI)
CMI includes the internal HA services used for:
* Device Trust
* ConfigSync
* Failover
* Mirroring
These essential HA communications bypass Port Lockdown to prevent accidental cluster failure.
The well-known port for this traffic isTCP 4353, which is always permitted.
Why the other options are incorrect:
Option A:SSHisrestricted by Port Lockdown unless explicitly allowed.
Option B:Same issue - SSH does not bypass Port Lockdown.
OnlyDefined VS Traffic,ICMP, andCMIbypass Port Lockdown.

NEW QUESTION # 18
......
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