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| Certification Vendor: | F5 |
|---|---|
| Exam Name: | F5 BIG-IP Administration Data Plane Concepts (F5CAB2) |
| Exam Number: | F5CAB2 |
| Related Certifications: | F5 BIG-IP Administrator F5 Application Delivery Fundamentals F5 Certified Administrator (F5-CA) |
| Exam Format: | Multiple Choice, Scenario-based Questions |
| Available Languages: | English |
| Recommended Training: | F5 BIG-IP Fundamentals Training |
| Exam Registration: | F5 Training & Certification Portal |
| Sample Questions: | F5 F5CAB2 Sample Questions |
| Exam Way: | Online proctored or authorized testing center (varies by region) |
| Pre Condition: | Basic networking knowledge and familiarity with TCP/IP concepts are recommended. |
| Official Syllabus URL: | https://www.f5.com/services/training-certification |
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질문 # 53
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)
정답：D
설명：
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.
질문 # 54
An application is configured so that the same pool member must be used for an entire session, as well as for HTTP and FTP traffic. A user reports that a session has terminated, and the user must restart the session. The BIG-IP Administrator determines that the active BIG-IP device failed over to the standby BIG-IP device. Which configuration settings should the BIG-IP Administrator verify to ensure proper behavior when BIG-IP failover occurs?
정답：A
설명：
In this scenario, two specific High Availability and Persistence requirements must be met to ensure session continuity during a failover.
Persistence Mirroring: By default, persistence records (which map a client to a specific server) exist only on the memory of the active BIG-IP. If a failover occurs, the standby unit has no knowledge of these sessions and will re-load-balance the client, likely to a different server. Enabling Persistence Mirroring ensures that the persistence table is synchronized in real-time to the standby peer.
Match Across Services: The requirement specifies that the session must persist across both HTTP and FTP. These are different Virtual Servers (and likely different ports). The Match Across Services setting in the persistence profile allows the BIG-IP to use the same persistence record for any Virtual Server that shares the same IP address and pool, regardless of the service port.
질문 # 55
Refer to the exhibit above.
A BIG-IP pool is configured withPriority Group Activation = Less than 2 available members. The pool members have different priority groups and availability states. Which pool members arereceiving traffic?
(Choose one answer)
정답：C
설명：
This question tests understanding ofPriority Group Activation (PGA)and how BIG-IP determines which pool members are eligible to receive traffic.
Key BIG-IP Priority Group Concepts:
* Higher priority group numbers = higher priority
* BIG-IP willonly send traffic to the highest priority groupthat meets thePriority Group Activation condition
* Lower priority groups areactivated only when the condition is met
* Onlyavailable (green)members count toward the activation threshold
Configuration from the Exhibit:
* Priority Group Activation:Less than 2 available members
* Pool Members and Status:
Pool Member
Priority Group
Status
serv1
2
Active (available)
serv2
2
Inactive (down)
serv3
1
Active (available)
serv4
1
Active (available)
Step-by-Step Traffic Decision:
* BIG-IP first evaluates thehighest priority group (Priority Group 2)
* Priority Group 2 has:
* serv1 # available
* serv2 # unavailable
* Total available members = 1
* Activation rule isLess than 2 available members
* Condition istrue(1 < 2)
* BIG-IPactivates the next lower priority group (Priority Group 1)
* Traffic is now sent to:
* serv1 (Priority Group 2)
* serv3 and serv4 (Priority Group 1)
Final Result:
Traffic is distributed toserv1, serv3, and serv4
Why the Other Options Are Incorrect:
* A- Ignores activation of the lower priority group
* B- serv4 is also active and eligible
* C- serv2 is down and cannot receive traffic
Key Data Plane Concept Reinforced:
Priority Group Activation controls when lower-priority pool members are allowed to receive traffic, based strictly on the number ofavailable membersin the higher-priority group. In this case, the failure of one high-priority member caused BIG-IP toexpand traffic distributionto lower-priority members to maintain availability.
질문 # 56
Which event is always triggered when a client initially connects to a virtual server configured with an HTTP profile?
정답：D
설명：
The BIG-IP processing flow follows a specific sequence of events as a packet moves through the system.
* TCP Handshake: Before any application-layer data (like HTTP) can be processed, a TCP connection must be established.
* The First Event: The very first event triggered when a client completes the 3-way handshake with the virtual server is CLIENT_ACCEPTED.
* Profile Influence: Even if an HTTP profile is attached, the system must first "accept" the connection at the protocol level. HTTP_REQUEST only triggers after the client sends data that the BIG-IP recognizes as a valid HTTP request. If a client connects but never sends a request, CLIENT_ACCEPTED will have fired, but HTTP_REQUEST will not.
질문 # 57
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)
정답：D
설명：
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.
질문 # 58
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