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Exam F5 F5CAB2 Testking - Reliable F5CAB2 Braindumps Questions

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Exam F5 F5CAB2 Testking - Reliable F5CAB2 Braindumps Questions

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F5 BIG-IP Administration Data Plane Concepts (F5CAB2) Sample Questions (Q11-Q16):NEW QUESTION # 11
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)
  • A. The Tag value on the Active device
  • B. The Interface on the Standby device to 1.1
  • C. The interface on the Active device to 1.1
  • D. The Tag value on the Standby device
Answer: B
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 # 12
Active connections to pool members are unevenly distributed. The load balancing method is Least Connections (member). Priority Group Activation is disabled.
What is a potential cause of the uneven distribution? (Choose one answer)
  • A. Incorrect load balancing method
  • B. A persistence profile is applied
  • C. SSL Profile Server is applied
  • D. Priority Group Activation is disabled
Answer: B
Explanation:
Comprehensive and Detailed Explanation (BIG-IP Administration - Data Plane Concepts):
With Least Connections (member), BIG-IP attempts to send new connections to the pool member with the fewest current connections. In a perfectly "stateless" scenario (no affinity), this often trends toward a fairly even distribution over time.
However, persistence overrides load balancing:
When a persistence profile is applied, BIG-IP will continue sending a client (or client group) to the same pool member based on the persistence record (cookie / source address / SSL session ID, etc.).
This means even if another pool member has fewer connections, BIG-IP may still select the persisted member to honor session affinity.
The result can be uneven active connection counts, even though the configured load balancing method is Least Connections.
Why the other options are not the best cause:
A . Priority Group Activation is disabled
Priority Group Activation only affects selection when priority groups are configured; disabling it does not inherently create uneven distribution under Least Connections.
B . SSL Profile Server is applied
A server-side SSL profile affects encryption to pool members, but it does not by itself cause skewed selection across pool members. (Skew could happen indirectly if members have different performance/latency, but that's not the primary, expected exam answer.) D . Incorrect load balancing method Least Connections is a valid method and does not itself explain unevenness unless something is overriding it (like persistence) or pool members are not all eligible.
Conclusion:
A persistence profile is the most common and expected reason that active connections become unevenly distributed, because persistence takes precedence over the Least Connections load-balancing decision.

NEW QUESTION # 13
An organization needs to deploy an HTTP application on a BIG-IP system. The requirements specify hardware acceleration to enhance performance, while HTTP optimization features are not required.
What type of virtual server and associated protocol profile should be used to meet these requirements? (Choose one answer)
  • A. Type: Stateless Protocol Profile: fastL4
  • B. Type: Standard Protocol Profile: tcp-wan-optimized
  • C. Type: Performance (HTTP) Protocol Profile: fasthttp
  • D. Type: Performance (Layer 4) Protocol Profile: fastL4
Answer: D
Explanation:
Comprehensive and Detailed Explanation From BIG-IP Administration Data Plane Concepts documents:
To select the correct virtual server type, an administrator must balance the need for L7 intelligence versus raw throughput and hardware offloading:
Performance (Layer 4) Virtual Server: This type is designed for maximum speed. It uses the fastL4 profile, which allows the BIG-IP system to leverage the ePVA (Embedded Packet Velocity Accelerator) hardware chip. When a Performance (L4) virtual server is used, the system processes packets at the network layer (L4) without looking into the application payload (L7). This fulfills the requirement for hardware acceleration and avoids the overhead of HTTP optimization features, which are not needed in this scenario.
Performance (HTTP) Virtual Server: While fast, this type uses the fasthttp profile to provide some L7 awareness and optimization (like header insertion or small-scale multiplexing). Since the requirement specifically states HTTP optimization is not required, the L4 variant is more efficient.
Standard Virtual Server: This is a full-proxy type. While it offers the most features (SSL offload, iRules, Compression), it processes traffic primarily in the TMOS software layer (or via high-level hardware assistance), which is "slower" than the pure hardware switching path of the Performance (L4) type.
Stateless Virtual Server: This is typically used for specific UDP/ICMP traffic where the system does not need to maintain a connection table. It is not appropriate for standard HTTP (TCP) applications requiring persistent sessions or stateful load balancing.
By choosing Performance (Layer 4) with the fastL4 profile, the organization ensures that the traffic is handled by the hardware acceleration chips, providing the lowest latency and highest throughput possible for their HTTP application.

NEW QUESTION # 14
A BIG-IP Administrator assigns the default HTTP health monitor to a pool that has three members listening on port 80. When the administrator connects to each pool member using the curl utility, two of the members respond with a status of 404 Not Found, while the third responds with 200 OK. What will the pool show for member availability? (Choose one answer)
  • A. Two members offline and one member online
  • B. All members online
  • C. Two members online and one member offline
  • D. All members offline
Answer: A
Explanation:
Comprehensive and Detailed Explanation From BIG-IP Administration Data Plane Concepts documents:
In BIG-IP LTM, pool member availability is determined by health monitors, which continuously test application responsiveness and correctness.
For the default HTTP monitor, the behavior is defined as follows:
BIG-IP sends an HTTP request (by default, GET /)
The monitor expects a response with HTTP status 200 OK
Any HTTP response code other than 200 is considered a monitor failure
A failed monitor causes the associated pool member to be marked offline (down) Applying this to the scenario:
Two pool members return 404 Not Found
A 404 response indicates the requested object is missing
This response does not satisfy the success criteria of the default HTTP monitor BIG-IP marks these two members as offline One pool member returns 200 OK This matches the expected response code BIG-IP marks this member as online Resulting Pool Status:
2 members: Offline
1 member: Online
Why the Other Options Are Incorrect:
B - Members returning 404 responses cannot be considered healthy
C - At least one member responds with 200 OK, so the entire pool is not offline D - Not all members meet the monitor success criteria Key Data Plane Concept Reinforced:
BIG-IP health monitors validate not just reachability, but application correctness. For HTTP monitors, the response code is critical-404 is treated as a failure, even though the service is reachable.

NEW QUESTION # 15
Which of the following lists the order of preference from most preferred to least preferred when BIG-IP processes and selects a virtual server? (Choose one answer)
  • A. Destination host address → Source host address → Service port
  • B. Source host address → Service port → Destination host address
  • C. Service port → Destination host address → Source host address
Answer: A
Explanation:
The BIG-IP system uses a specific precedence algorithm to determine which virtual server (listener) should process an incoming packet when multiple virtual servers might match the criteria. Since BIG-IP version 11.3.0, the system evaluates three primary factors in a fixed order of importance:
Destination Address: The system first looks for the most specific destination match. A "Host" address (mask /32) is preferred over a "Network" address (mask /24, /16, etc.), which is preferred over a "Wildcard" (0.0.0.0/0).
Source Address: If multiple virtual servers have identical destination masks, the system then evaluates the source address criteria. Again, a specific source host match is preferred over a source network or a wildcard source.
Service Port: Finally, if both destination and source specifications are equal, the system checks the port. A specific port match (e.g., 80) is preferred over a wildcard port (e.g., or 0).
Following this logic, a virtual server configured with a specific destination host, a specific source host, and a specific service port represents the highest level of specificity and thus the highest preference.

NEW QUESTION # 16
......
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