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| Certification Vendor: | F5 |
|---|---|
| Exam Name: | BIG-IP Administration Data Plane Concepts |
| Exam Number: | F5CAB2 |
| Available Languages: | English |
| Passing Score: | Pass/Fail (Scaled scoring, specific threshold not publicly disclosed per sub-exam) |
| Real Exam Qty: | 30 |
| Related Certifications: | F5 Certified Administrator, BIG-IP (F5-CA) |
| Exam Format: | Scenario-based, Multiple Choice |
| Exam Price: | $50 USD |
| 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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質問 # 30
Which statement is true concerning the default communication between a redundant pair of BIG-IP devices?
正解：A
解説：
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).
質問 # 31
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 the servers on the new VLAN are NOT reachable from the BIG-IP device.
Which action should the BIG-IP Administrator take to resolve this issue? (Choose one answer)
正解：B
解説：
Comprehensive and Detailed Explanation (BIG-IP Administration - Data Plane Concepts):
For BIG-IP to send or receive traffic on a VLAN, that VLAN must be bound to a physical interface or a trunk. Creating a VLAN object and a Self IP alone is not sufficient to 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 a Layer 2 connectivity issue, not a Layer 3 or HA issue.
Why assigning a physical interface fixes the problem:
BIG-IP VLANs do not carry traffic unless they are explicitly attached to:
A physical interface (e.g., 1.1), or
A trunk
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 All
Port Lockdown controls which services can be accessed on the Self IP (management-plane access), not whether BIG-IP can reach servers on that VLAN.
B . Change Auto Last Hop to enabled
Auto Last Hop affects return traffic routing for asymmetric paths. It does not fix missing Layer 2 connectivity.
D . Create a Floating Self IP address
Floating 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 has no physical interface assigned. To restore connectivity, the BIG-IP Administrator must assign a physical interface (or trunk) to the VLAN, enabling Layer 2 traffic flow.
質問 # 32
When is an interface considered Available for use in a trunk?
正解：A
解説：
For an interface to be used as a physical member of a BIG-IP trunk, it must be free from conflicting Layer 2 assignments. In this question, the correct condition is that the interface is not assigned to a VLAN.
BIG-IP trunks aggregate multiple physical interfaces into one logical interface. The normal configuration sequence is to create the trunk from eligible physical interfaces and then assign the trunk itself to one or more VLANs. F5 documentation specifies that an interface assigned to a trunk must be an untagged interface and cannot simultaneously belong to another trunk. The Configuration utility therefore restricts which physical interfaces are presented as eligible trunk members.
An interface that is already directly participating in VLAN configuration is not treated as an available standalone interface for the intended trunk configuration. Instead, the physical interfaces are first aggregated, after which the resulting trunk becomes the VLAN member.
Option A is incorrect because a tagged interface has VLAN association and is not the prerequisite state for adding the physical interface to a trunk. Option B is also incorrect: an interface being administratively or operationally DOWN does not define trunk eligibility and may prevent it from becoming an active working link.
Study Guide Reference/Topics: Physical Interfaces; Trunk Configuration; Link Aggregation; VLAN Membership; Tagged and Untagged Interfaces; Interface Availability.
質問 # 33
An application is configured so that the same pool member must be used for an entire session, and this behavior must persist across HTTP and FTP traffic. A user reports that a session terminates and must be restarted after the active BIG-IP device fails over to the standby device.
Which configuration settings should the BIG-IP Administrator verify to ensure proper behavior when BIG-IP failover occurs? (Choose one answer)
正解：B
解説：
This scenario combines session continuity, multiple protocols (HTTP and FTP), and HA failover behavior
, which directly implicates persistence handling across devices and services.
Key Requirements Breakdown
* Same pool member for entire session
* Session must survive failover
* Session must span multiple services (HTTP and FTP)
Why Persistence Mirroring + Match Across Services Is Required
Persistence Mirroring
* Ensures persistence records are synchronized from the active BIG-IP to the standby BIG-IP.
* Without mirroring:
* After failover, the standby device has no persistence table
* Clients are load-balanced again
* Sessions break, forcing users to restart
* Persistence mirroring is essential for session continuity during failover Match Across Services
* Allows a single persistence record to be shared across multiple virtual servers / protocols
* Required when:
* HTTP and FTP must use the same pool member
* Multiple services are part of a single application session
Together, these settings ensure:
* Persistence survives device failover
* Persistence is honored across HTTP and FTP
Why the Other Options Are Incorrect
* A. Cookie persistence and session timeoutCookie persistence only applies to HTTP and does not address FTP or failover synchronization.
* B. Stateful failover and Network Failover detectionStateful failover applies to connection state, not persistence records, and does not link HTTP and FTP sessions.
* D. SYN-cookie insertion threshold and connection low-water markThese are DoS / SYN flood protection settings, unrelated to persistence or HA behavior.
質問 # 34
When upgrading a BIG-IP redundant pair, what happens when one system has been updated but the other has not?
正解：A
解説：
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.
質問 # 35
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