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| Certification Vendor: | F5 |
|---|---|
| Exam Name: | F5 BIG-IP Administration Data Plane Concepts (F5CAB2) |
| Exam Number: | F5CAB2 |
| Exam Format: | Scenario-based Questions, Multiple Choice |
| Available Languages: | English |
| Related Certifications: | F5 Certified Administrator (F5-CA) F5 Application Delivery Fundamentals F5 BIG-IP Administrator |
| 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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NEW QUESTION # 47
In the GUI, where should the BIG-IP Administrator configure an existing VLAN named external to a specific interface as untagged?
Answer: C
Explanation:
In the BIG-IP system, VLANs are the logical entities that group physical interfaces or trunks together. To modify how a VLAN interacts with an interface, the administrator must navigate to the specific VLAN configuration object.
* VLAN List:This section displays all existing VLANs configured on the system.
* Interface Association:Within the properties of a specific VLAN (in this case, "external"), there is an Interfacessection. This is where physical ports or trunks are assigned to the VLAN.
* Tagging Status:For each associated interface, the administrator can choose betweenTagged(802.1Q) or Untagged.
* Untagged:The interface will treat incoming traffic without a VLAN header as part of this VLAN, and outgoing traffic will not have a VLAN tag added. An interface can only be "Untagged" for one VLAN.
* Tagged:Allows an interface to carry traffic for multiple VLANs simultaneously by using 802.1Q headers.
NEW QUESTION # 48
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?
Answer: A
Explanation:
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. EnablingPersistence Mirroringensures 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 bothHTTPand FTP. These are different Virtual Servers (and likely different ports). TheMatch Across Servicessetting 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.
NEW QUESTION # 49
Refer to the exhibit above.
A BIG-IP pool is configured with Priority Group Activation = Less than 2 available members. The pool members have different priority groups and availability states. Which pool members are receiving traffic?
(Choose one answer)
Answer: C
Explanation:
This question tests understanding of Priority 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 will only send traffic to the highest priority group that meets the Priority Group Activation condition
* Lower priority groups are activated only when the condition is met
* Only available (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 the highest priority group (Priority Group 2)
* Priority Group 2 has:
* serv1 # available
* serv2 # unavailable
* Total available members = 1
* Activation rule is Less than 2 available members
* Condition is true (1 < 2)
* BIG-IP activates 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 to serv1, 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 of available members in the higher-priority group. In this case, the failure of one high-priority member caused BIG-IP to expand traffic distribution to lower-priority members to maintain availability.
NEW QUESTION # 50
When using the setup utility to configure a redundant pair, you are asked to provide a "Failover Peer IP".
Which address is this?
Answer: C
Explanation:
When establishing a redundant pair, each device must know where to send its health heartbeats and sync data.
* The Peer IP:TheFailover Peer IPis the IP address belonging to theotherBIG-IP device in the HA pair.
This is typically a34Self-IP on a dedicated "HA" or "Internal" VLAN, or the Management IP.
* Purpose:It identifies the destination for the "Heartbeat" (the "Are you alive?" check).
* Setup Context:During the initial setup, you tell Device A to look for Device B at its "Failover Peer IP," and you tell Device B to look for Device A at its respective "Failover Peer IP."
NEW QUESTION # 51
What type of virtual server should be used to load balance UDP traffic without considering previous connections?
Answer: B
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 # 52
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