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| Certification Vendor: | F5 |
|---|---|
| Exam Name: | BIG-IP Administration Data Plane Concepts |
| Exam Number: | F5CAB2 |
| Exam Price: | $50 USD |
| Related Certifications: | F5 Certified Administrator, BIG-IP (F5-CA) |
| Available Languages: | English |
| Real Exam Qty: | 30 |
| Passing Score: | Pass/Fail (Scaled scoring, specific threshold not publicly disclosed per sub-exam) |
| Exam Format: | Multiple Choice, Scenario-based |
| Exam Duration: | 30 minutes |
| Sample Questions: | F5 F5CAB2 Sample Questions |
| Exam Way: | Online (Pearson VUE) |
| Pre Condition: | None specified. It is one of five exams required for the F5 Certified Administrator, BIG-IP credential. |
| Official Syllabus URL: | https://education.f5.com/courses/1089 |
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NEW QUESTION # 52
Refer to the exhibit.
The network team creates a new VLAN on the switches. The BIG-IP Administrator creates a new VLAN and a Self IP on the BIG-IP device, but theservers on the new VLAN are NOT reachablefrom the BIG-IP device.
Which action should the BIG-IP Administrator take to resolve this issue? (Choose one answer)
Answer: D
Explanation:
For BIG-IP to send or receive traffic on a VLAN, that VLANmust be bound to a physical interface or a trunk. Creating a VLAN object and a Self IP alone isnot sufficientto establish data-plane connectivity.
From the exhibit:
* The VLAN (vlan_1033) exists and has a tag defined.
* A Self IP is configured and associated with the VLAN.
* However, traffic cannot reach servers on that VLAN.
This indicates aLayer 2 connectivity issue, not a Layer 3 or HA issue.
Whyassigning a physical interfacefixes the problem:
* BIG-IP VLANs do not carry traffic unless they are explicitly attached to:
* Aphysical interface(e.g., 1.1), or
* Atrunk
* Without an interface assignment, the VLAN is effectively isolated and cannot transmit or receive frames, making servers unreachable regardless of correct IP addressing.
Why the other options are incorrect:
* A. Set Port Lockdown to Allow AllPort Lockdown controls which services can be accessedon the Self IP(management-plane access), not whether BIG-IP can reach servers on that VLAN.
* B. Change Auto Last Hop to enabledAuto Last Hop affects return traffic routing for asymmetric paths. It does not fix missing Layer 2 connectivity.
* D. Create a Floating Self IP addressFloating Self IPs are used for HA failover. They do not resolve reachability issues on a single device when the VLAN itself is not connected to an interface.
Conclusion:
The servers are unreachable because the VLAN hasno physical interface assigned. To restore connectivity, the BIG-IP Administrator mustassign a physical interface (or trunk) to the VLAN, enabling Layer 2 traffic flow.
NEW QUESTION # 53
A BIG-IP Administrator is informed that traffic on interface 1.1 is expected to increase beyond the maximum bandwidth capacity of the link. There is a single VLAN on the interface.
What should the BIG-IP Administrator do to increase the total available bandwidth? (Choose one answer)
Answer: C
Explanation:
Comprehensive and Detailed Explanation (BIG-IP Administration - Data Plane Concepts):
On BIG-IP systems, physical interface bandwidth is fixed by the link speed (for example, 1GbE or 10GbE). When traffic demand exceeds the capacity of a single interface, BIG-IP provides link aggregation through trunks.
Key concepts involved:
Interfaces
A single physical interface (such as 1.1) is limited to its negotiated link speed. You cannot exceed this capacity through software tuning alone.
Trunks (Link Aggregation)
A trunk combines multiple physical interfaces into a single logical interface.
BIG-IP supports LACP and static trunks.
Traffic is distributed across member interfaces, increasing aggregate bandwidth and providing redundancy.
VLANs are then assigned to the trunk, not directly to individual interfaces.
Why option B is correct:
Creating a trunk with two interfaces allows BIG-IP to use both physical links simultaneously.
This increases total available bandwidth (for example, two 10Gb interfaces โ up to 20Gb aggregate capacity).
This is the documented and supported method for scaling bandwidth on BIG-IP.
Why the other options are incorrect:
A . Increase the MTU
MTU changes affect packet size and efficiency, not total bandwidth capacity.
C . Assign two interfaces to the VLAN
BIG-IP does not support assigning a VLAN to multiple interfaces directly. VLANs must be associated with one interface or one trunk.
D . Set the media speed manually
Media speed can only be set up to the physical capability of the interface and connected switch port. It cannot exceed the hardware limit.
Conclusion:
To increase total available bandwidth on BIG-IP when a single interface is insufficient, the administrator must create a trunk object with multiple interfaces and move the VLAN onto the trunk. This aligns directly with BIG-IP data plane design and best practices.
NEW QUESTION # 54
Refer to the exhibit.
During a planned upgrade to a BIG-IP HA pair running Active/Standby, an outage to application traffic is reported shortly after the Active unit is forced to Standby. Reverting the failover resolves the outage. What should the BIG-IP Administrator modify to avoid an outage during the next failover event? (Choose one answer)
Answer: D
Explanation:
Comprehensive and Detailed Explanation (BIG-IP Administration - Data Plane Concepts):
In an Active/Standby BIG-IP design, application availability during failover depends on both units having equivalent data-plane connectivity for the networks that carry application traffic. Specifically:
VLANs are bound to specific interfaces (and optionally VLAN tags).
Floating self IPs / traffic groups move to the new Active device during failover.
For traffic to continue flowing after failover, the new Active device must have the same VLANs available on the correct interfaces that connect to the upstream/downstream networks.
What the symptom tells you:
Traffic works when Device A is Active
Traffic fails when Device B becomes Active
Failback immediately restores traffic
This pattern strongly indicates the Standby unit does not have the VLAN connected the same way (wrong physical interface assignment), so when it becomes Active, it owns the floating addresses but cannot actually pass traffic on the correct network segment.
Why Interface mismatch is the best match:
If the Active unit is already working, its interface mapping is correct.
The fix is to make the Standby unit's VLAN/interface assignment match the Active unit.
That corresponds to changing the Standby device interface to 1.1.
Why the Tag options are less likely here (given the choices and the exhibit intent):
Tag issues can also break failover traffic, but the question/options are clearly driving toward the classic HA requirement: consistent VLAN-to-interface mapping on both devices so the data plane remains functional after the traffic group moves.
Conclusion: To avoid an outage on the next failover, the BIG-IP Administrator must ensure the Standby device uses the same interface (1.1) for the relevant VLAN(s) that carry the application traffic, so when it becomes Active it can forward/receive traffic normally.
NEW QUESTION # 55
A BIG-IP Administrator has a cluster of devices. What should the administrator do after creating a new Virtual Server on device 1?
Answer: D
Explanation:
F5 BIG-IP uses aConfigSyncmechanism to ensure that all members of a Device Service Cluster (DSC) share the same configuration.
* Manual Synchronization:By default, configuration changes made on one device (the "source") do not automatically propagate to other members.
* Direction of Sync:Once a Virtual Server is created on device 1, that device's configuration is now
"newer" than the rest of the group. The administrator must initiate a synchronization from themodified device (device 1) to the Sync-Failover group.
* Consistency:This ensures that if a failover occurs, device 2 (the standby) will have the exact same Virtual Server configuration and can take over traffic immediately without interruption.
NEW QUESTION # 56
To increase the available bandwidth of an existing trunk, the BIG-IP Administrator plans to add additional interfaces. Which command should the BIG-IP Administrator run from within the bash shell? (Choose one answer)
Answer: D
Explanation:
In BIG-IP, a trunk is a Layer 2 network object used to aggregate multiple physical interfaces into a single logical link. This aggregation provides increased bandwidth and link resiliency, commonly in conjunction with LACP.
Key concepts that apply here:
* Trunks are managed under the /net trunk tmsh hierarchy
* Physical interfaces are added or removed using the modify command
* The create command is used only when defining a brand-new trunk, not when updating an existing one Because the trunk already exists and the goal is to add interfaces, the correct operation is:
tmsh modify /net trunk trunk_A interfaces add {1.3 1.4}
This command:
* Modifies the existing trunk named trunk_A
* Adds interfaces 1.3 and 1.4 to the trunk
* Immediately increases available bandwidth and redundancy
Why the Other Options Are Incorrect
* B uses the /sys hierarchy, which is not used for trunks
* C attempts to create a trunk that already exists
* D uses an incorrect hierarchy and an incorrect operation
NEW QUESTION # 57
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