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[General] Real F5 F5CAB2 Questions - Your Key to Success

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【General】 Real F5 F5CAB2 Questions - Your Key to Success

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F5 BIG-IP Administration Data Plane Concepts (F5CAB2) Sample Questions (Q12-Q17):NEW QUESTION # 12
Which statement is true concerning the default communication between a redundant pair of BIG-IP devices?
  • A. Data for both connection and persistence mirroring are shared through the same TCP connection.
  • B. Connection mirroring data is shared through the serial fail over cable unless network failover is enabled.
  • C. Regardless of the configuration, some data is communicated between the systems at regular intervals.
  • D. Communication between the systems cannot be effected by port lockdown settings.
Answer: C
Explanation:
Redundant BIG-IP systems (HA pairs) must maintain constant communication to monitor the health of the peer and synchr15onize states.16
* Heartbeats: By default, even with a serial cable, th17e BIG-IP systems exchange "heartbeat" packets over the network to determine if the peer is still alive.
* Network Failover: This involves the exchange of UDP packets (typically on port 1026) at regular intervals.
* Device Service Clustering (DSC): Modern BIG-IP versions use the Central Management (cm) infrastructure to communicate configuration status and sync status constantly.
* Clarification on others: Port lockdown does affect HA communication if misconfigured (A is false).
Mirroring uses separate channels (B is false). Mirroring is never sent over the serial cable because it requires high bandwidth (D is false).

NEW QUESTION # 13
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 Interface on the Standby device to 1.1
  • B. The Tag value on the Standby device
  • C. The interface on the Active device to 1.1
  • D. The Tag value on the Active device
Answer: A
Explanation:
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 # 14
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 1.0.0.10:any (port 0)
  • B. A virtual server configured with destination 1.0.0.10:8080 and is available (green)
  • C. A virtual server configured with 0.0.0.0:8080
  • D. A forwarding virtual server configured with 0.0.0.0:any
Answer: B
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 # 15
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)
  • A. tmsh create /sys trunk trunk_A interfaces add {1.3 1.4}
  • B. tmsh modify /net trunk trunk_A interfaces add {1.3 1.4}
  • C. tmsh modify /sys trunk trunk_A interfaces add {1.3 1.4}
  • D. tmsh create /net trunk trunk_A interfaces add {1.3 1.4}
Answer: B
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 # 16
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. Synching should not be performed.
  • C. The older system will issue SNMP traps indicating a communication error with the partner.
  • D. The first system to be updated will assume the Active role.
Answer: B
Explanation:
The F5 BIG-IP upgrade process for HA pairs requires a specific "staggered" approach to maintain uptime.
* Version Mismatch: When one unit is upgraded to a newer version of TMOS (e.g., from 15.1 to 16.1), it enters a26 "Version Mismatch" 27state with its peer.
* Configuration Sync: Because the configuration schemas between different versions are often incompatible, ConfigSync should not be performed. Attempting to sync a newer configuration to an older system (or vice-versa) can cause configuration corruption or system instability.
* Failover Capability: Generally, a pair with a version mismatch can still fail over to ensure traffic continuity during the upgrade window, but administrative changes and syncs must be paused until both units are on the same version.

NEW QUESTION # 17
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