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| Certification Vendor: | F5 |
|---|---|
| Exam Name: | BIG-IP Administration Data Plane Concepts |
| Exam Number: | F5CAB2 |
| Passing Score: | Not officially disclosed |
| Exam Duration: | 30 minutes |
| Exam Price: | $50 USD |
| Certificate Validity Period: | 3 years |
| Real Exam Qty: | 30 |
| Available Languages: | English |
| Related Certifications: | F5 Certified Administrator, BIG-IP |
| Exam Format: | Scenario-based, Multiple choice |
| Recommended Training: | BIG-IP Administration Training Courses |
| Exam Registration: | F5 Education Portal Pearson VUE Certiverse |
| Sample Questions: | F5 F5CAB2 Sample Questions |
| Exam Way: | Online proctored (Certiverse) / In-person (Pearson VUE centers) |
| Pre Condition: | No mandatory prerequisites; can take in any order with other F5CAB exams |
| Official Syllabus URL: | https://education.f5.com/exams/big-ip-administration-data-plane-concepts |
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NEW QUESTION # 41
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)
Answer: D
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 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 # 42
What type of virtual server should be used to block responses for one IP in a subnet with a virtual server?
(Choose one answer)
Answer: A
Explanation:
In the BIG-IP system, when you need to prevent traffic from reaching a specific destination or being processed by the system, you utilize specific Virtual Server types that act as "denial" points.
* Reject Virtual Servers: When a packet matches a Reject virtual server, the BIG-IP system stops the packet from being processed and sends a reset (RST) in the case of TCP, or an ICMP unreachable message in the case of UDP. This is the preferred method for "blocking" specific IPs when you want the sender to receive immediate notification that the connection was refused.
* Drop Virtual Servers: A Drop virtual server simply discards the packet without sending any response back to the source. While effective for "stealthing" a network, it is often less desirable for standard administration unless specifically mitigating a DoS attack.
* Comparison with Standard: A Standard virtual server is used to process and load balance traffic to a pool of members; it does not inherently act as a "blocking" mechanism for a single IP within a subnet unless combined with complex iRules or Packet Filters.
* Context of the Question: To block responses (or connection attempts) for a specific IP while other traffic in the subnet might be handled by more permissive virtual servers, a more specific (higher precedence) Reject virtual server is the standard administrative approach.
NEW QUESTION # 43
When upgrading a BIG-IP redundant pair, what happens when one system has been updated but the other has not?
Answer: A
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 # 44
What type of virtual server should be used to load balance UDP traffic without considering previous connections?
Answer: C
Explanation:
When handling high-volume UDP traffic where the BIG-IP does not need to maintain any session history or relationship between packets, aStatelessvirtual server is the appropriate choice.
* No Connection Tracking:A stateless virtual server does not create or maintain entries in the BIG-IP connection table. This means the system processes each packet as an individual event, without
"considering previous connections" or packets from the same source.
* High Performance:Because the system bypasses the overhead of state management, stateless virtual servers provide the highest possible throughput for UDP and ICMP traffic.
* Use Cases:This is ideal for services like DNS (stateless queries) or some types of syslog traffic where each packet is independent and doesn't require the persistence or protocol inspection typically provided by a full-proxy.
Why other options are incorrect:
* Forwarding:While a Forwarding (IP) virtual server can handle UDP, it still maintains a state entry in the connection table to ensure return traffic is handled correctly.
* Standard:This is a full-proxy virtual server. It is inherently stateful and requires a connection table entry for every flow it manages.
* Reject:This is a special virtual server type that simply drops incoming traffic and, in the case of TCP, sends a reset (RST) or, for UDP, sends an ICMP unreachable message. It is not a load balancing type.
NEW QUESTION # 45
What is required for a virtual server to support clients whose traffic arrives on the internal VLAN and pool members whose traffic arrives on the external VLAN?
Answer: D
Explanation:
4647
Virtual Servers have a setting called VLAN and Tunnel Traffic which defines where the BIG-IP "listens" for new connections.4849 Ingress Logic: A virtual server is an entry point. It must be enab50led on the VLAN where the Client resides. If a client is on the "51Internal" VLAN, the Virtual Server must be enabled there to receive the traffic.
Egress Logic: The BIG-IP system uses the TMM Routing Table and Self-IPs to reach pool members. It does not need the Virtual Server to be "enabled" on the destination VLAN (External) to send traffic there.
Default Behavior: By default, Virtual Servers are enabled on "All VLANs." However, if restricted for security, the administrator must ensure the Virtual Server is active on the client-facing (ingress) VLAN.
NEW QUESTION # 46
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