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| Certification Vendor: | F5 |
|---|---|
| Exam Name: | F5 BIG-IP Administration: Install, Initial Configuration, and Upgrade |
| Exam Number: | F5CAB1 |
| Exam Format: | Multiple Choice |
| Available Languages: | English |
| Related Certifications: | F5 Certified Technology Specialist (LTM) F5 Certified BIG-IP Administrator |
| Recommended Training: | F5 BIG-IP Administration Fundamentals Course F5 LTM Essentials Training |
| Exam Registration: | F5 Training & Certification Portal |
| Sample Questions: | F5 F5CAB1 Sample Questions |
| Exam Way: | Online proctored or authorized testing center (varies by region) |
| Pre Condition: | Basic networking knowledge (TCP/IP, routing concepts) recommended |
| Official Syllabus URL: | https://www.f5.com/services/training-certification |
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NEW QUESTION # 21
The device is currently onv15.1.2.1.
The BIG-IP Administrator needs to boot the device back tov13.1.0.6to gather data for troubleshooting.
The system shows:
Sys::Software Status
Volume Product Version Build Active Status Allowed
HD1.1 BIG-IP 15.1.2.1 0.0.10 yes complete yes
HD1.2 BIG-IP 13.1.0.6 0.0.3 no complete yes
Which is the correct command-line sequence to boot the device to version13.1.0.6?
Answer: A
Explanation:
To change the boot volume on a BIG-IP system from one installed TMOS version to another, the correct CLI tool is:
switchboot
The correct syntax uses the-bflag:
switchboot -b <volume>
This command marks the specified boot location as the one to be used on the next reboot.
Thus, to boot intoHD1.2which contains13.1.0.6, the sequence is:
* Mark HD1.2 as the next boot location:
* switchboot -b HD1.2
* Reboot the system:
* reboot
This is the standard and officially supported method for selecting a different installed volume.
Why the other options are incorrect:
A). "tmsh reboot HD1.2"
* There is no such tmsh syntax.
* Boot volume cannot be selected by adding a parameter to reboot.
C). switchboot -I HD1.2
* The -I flag is invalid. Only -b is used.
D). "tmsh switchboot HD1.2"
* switchboot isnota tmsh command; it is a system-level shell utility.
Therefore,Option Bis the correct and valid command sequence.
NEW QUESTION # 22
The Service Check Date on the license matches the date that the BIG-IP was installed two years ago. Which of the following activities would require the BIG-IP Administrator to renew the license and update the Service Check Date for it to work?
Answer: B
Explanation:
Comprehensive and Detailed Explanation From BIG-IP Administration - Install, Initial Configuration, and Upgrade:
The Service Check Date embedded in the BIG-IP license acts as a gating mechanism that determines eligibility for software updates. F5 enforces that the Service Check Date must be equal to or newer than the software release date of any BIG-IP version being installed. If the installed license carries a Service Check Date from two years ago, attempting to upgrade to a newly released BIG-IP software version - whose release date post-dates that Service Check Date - will fail, as the system validates this date during the upgrade process.
Option A is incorrect - generating and uploading a QkView to F5 iHealth is a diagnostic activity that requires no license validation or Service Check Date verification whatsoever.
Option C is incorrect - ASM signature and threat campaign updates are content updates, not platform software upgrades. These updates are independent of the Service Check Date requirement and do not trigger license validation checks during installation.
Only a platform software upgrade to a newly released BIG-IP version directly invokes the Service Check Date validation, mandating license renewal prior to the upgrade proceeding successfully.
Reference Topics: License Service Check Date, Software Upgrade Prerequisites, License Reactivation - BIG- IP Administration Study Guide.
NEW QUESTION # 23
Which port is an exception to the Port Lockdown function of Self-IPs if a device-group synchronization cluster is configured?
Answer: B
Explanation:
Self-IPs implement a security feature known asPort Lockdown, which limits which services are reachable on a Self-IP.
However, certain services required for BIG-IP device-to-device communication bypass Port Lockdown to ensure cluster and HA functionality.
TCP 4353
* TCP port4353is used byDevice Service Clustering (DSC)for:
* Device trust establishment
* Configuration synchronization
* Failover communication
* Because BIG-IP devices must always be able to communicate for HA functions to remain operational, port 4353 isexempt from Port Lockdown rules.
Why the other options are incorrect
A). TCP 443
* Not required for device trust or synchronization.
* HTTPS access is fully controlled by Port Lockdown.
C). UDP 53
* DNS traffic is not required for synchronization and has no exemption under Port Lockdown.
NEW QUESTION # 24
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: B
Explanation:
The exhibit shows aSelf IPwith:
* VLAN:Data
* 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 # 25
Refer to the exhibit. What traffic will be permitted to reach the BIG-IP?
Answer: B
Explanation:
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?
Not allowed
FTP TCP 21 Not listed
Allowed
SSH TCP 22 Listed
Not allowed
Telnet TCP 23 Not listed
Thus, SSH is the only traffic permitted through this Self IP configuration.
NEW QUESTION # 26
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