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[General] F5CAB2 Practice Test | Valid Study F5CAB2 Questions

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【General】 F5CAB2 Practice Test | Valid Study F5CAB2 Questions

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F5 BIG-IP Administration Data Plane Concepts (F5CAB2) Sample Questions (Q22-Q27):NEW QUESTION # 22
A BIG-IP system receives a client connection destined to 1.0.0.10:8080. Multiple virtual servers are configured on the system. Which virtual server will process the connection? (Choose one answer)
  • A. A forwarding virtual server configured with 0.0.0.0:any
  • B. A virtual server configured with 0.0.0.0:8080
  • C. A virtual server configured with destination 1.0.0.10:8080 and is available (green)
  • D. A forwarding virtual server configured with 1.0.0.10:any (port 0)
Answer: C
Explanation:
Comprehensive and Detailed Explanation From BIG-IP Administration Data Plane Concepts documents:
BIG-IP uses a virtual server matching and precedence algorithm to determine which virtual server processes an incoming connection. This decision is made entirely in the data plane and is based on how specifically a virtual server matches the destination IP address and port.
BIG-IP Virtual Server Selection Rules (Simplified):
When multiple virtual servers could match a packet, BIG-IP selects the most specific match, using the following precedence:
Exact IP address and exact port
Exact IP address with wildcard port (port 0 / any)
Wildcard IP address with exact port
Wildcard IP address and wildcard port
Applying the Rules to This Scenario:
Incoming traffic destination: 1.0.0.10:8080
Option C: 1.0.0.10:8080
Exact IP match
Exact port match
Highest possible specificity
If the virtual server is available (green), it wins the match
Option B: 1.0.0.10:any
Exact IP match, but wildcard port
Lower priority than an exact IP + exact port match
Option D: 0.0.0.0:8080
Wildcard IP, exact port
Lower priority than an exact IP match
Option A: 0.0.0.0:any
Wildcard IP and wildcard port
Lowest priority, used only if no more specific virtual server exists
Final Determination:
Because a virtual server configured with destination 1.0.0.10:8080 exactly matches both the IP address and port of the incoming connection-and is available-it will always be selected to process the traffic.
Key Data Plane Concept Reinforced:
BIG-IP always processes traffic using the most specific matching virtual server. Exact destination IP and port matches take precedence over any wildcard or forwarding virtual server definitions.

NEW QUESTION # 23
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. SSL Profile Server is applied
  • C. A persistence profile is applied
  • D. Priority Group Activation is disabled
Answer: C
Explanation:
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 disabledPriority 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 appliedA 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 methodLeast 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 # 24
When upgrading a BIG-IP redundant pair, what happens when one system has been updated but the other has not?
  • A. This is not possible since both systems are updated simultaneously.
  • B. The older system will issue SNMP traps indicating a communication error with the partner.
  • C. The first system to be updated will assume the Active role.
  • D. Synching should not be performed.
Answer: D

NEW QUESTION # 25
A BIG-IP Administrator makes a configuration change to a Virtual Server on the Standby device of an HA pair. The HA pair is currently configured with Auto-Sync enabled. What effect will the change have on the HA pair configuration? (Choose one answer)
  • A. The change will be propagated next time a configuration change is made on the Active device.
  • B. The change will be undone next time a configuration change is made on the Active device.
  • C. The change will be undone when Auto-Sync propagates the config to the Standby device.
  • D. The change will take effect when Auto-Sync propagates the config to the HA pair.
Answer: C
Explanation:
Comprehensive and Detailed Explanation From BIG-IP Administration Data Plane Concepts documents:
In a BIG-IP high availability (HA) configuration, Auto-Sync is a device trust feature that automatically synchronizes configuration changes from the Active device to the Standby device within a Sync-Failover device group.
Key principles from BIG-IP Administration Data Plane Concepts:
The Active device is always the authoritative source of configuration
Configuration changes are intended to be made only on the Active device With Auto-Sync enabled, any time the Active device configuration changes, the system automatically pushes the configuration to all Standby members of the device group Configuration changes made directly on a Standby device are not preserved In this scenario:
The administrator modifies a Virtual Server on the Standby device
That change is local only and does not alter the device group's synchronized configuration When Auto-Sync next runs (triggered by a change on the Active device or an internal sync event), the Active device configuration overwrites the Standby configuration As a result, the configuration change made on the Standby device is undone.
Why the Other Options Are Incorrect:
A - The change is not undone only when another change is made; it is undone during the next Auto-Sync operation B - Changes made on the Standby device are never propagated to the Active device D - Auto-Sync does not merge or promote Standby changes into the HA pair configuration Best Practice Reinforced:
Always perform configuration changes on the Active BIG-IP device when Auto-Sync is enabled to ensure consistent and predictable HA behavior.

NEW QUESTION # 26
A BIG-IP Administrator needs to connect a BIG-IP system to two upstream switches to provide external network resilience. The network engineer instructs the administrator to configure interface binding with LACP. Which configuration should the administrator use? (Choose one answer)
  • A. A Trunk containing an interface connected to each switch.
  • B. A Trunk listing the allowed VLAN IDs and MAC addresses configured on the switches.
  • C. A virtual server with an LACP profile and the switches' management IPs as pool members.
  • D. A virtual server with an LACP profile and the interfaces connected to the switches as pool members.
Answer: A
Explanation:
In BIG-IP architecture, link aggregation and redundancy at Layer 2 are implemented using Trunks, not virtual servers or pools.
According to BIG-IP Administration Data Plane Concepts:
* Interfaces are the physical network ports on the BIG-IP device
* A Trunk is a logical grouping of multiple interfaces
* Trunks can be configured to use LACP (Link Aggregation Control Protocol) to:
* Provide link redundancy
* Increase aggregate bandwidth
* Allow automatic detection of link failures
* VLANs are then assigned to the trunk, not directly to individual interfaces, once aggregation is in place Correct Design for the Scenario:
To connect BIG-IP to two upstream switches with LACP:
* One physical interface from BIG-IP connects to Switch A
* Another physical interface from BIG-IP connects to Switch B
* Both interfaces are placed into the same trunk
* LACP is enabled on the trunk and on the switches
This configuration allows:
* Traffic to continue flowing if one interface or switch fails
* Proper LACP negotiation between BIG-IP and the upstream switches
* Clean separation of responsibilities (Layer 2 handled by trunking, Layer 4-7 by virtual servers) Why Option D Is Correct:
* A Trunk containing an interface connected to each switch is exactly how BIG-IP implements LACP- based interface binding
* The trunk handles link state, load distribution, and failover at the data plane Why the Other Options Are Incorrect:
* A & B - Virtual servers operate at Layers 4-7 and have nothing to do with physical link aggregation or LACP
* C - VLAN IDs and MAC addresses are not configured inside a trunk definition; trunks aggregate interfaces, and VLANs are applied to trunks Key Data Plane Concept Reinforced:
On BIG-IP systems, LACP is always configured on a Trunk, which aggregates physical interfaces to provide Layer 2 resiliency and bandwidth aggregation. Virtual servers and pools are not involved in physical interface binding.

NEW QUESTION # 27
......
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