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F5 F5CAB2 Exam Syllabus Topics:

TopicDetails
Topic 1
  • Identify the different virtual server types: This domain covers BIG-IP virtual server types: Standard, Forwarding, Stateless, Reject, Performance Layer 4, and Performance HTTP.
Topic 2
  • Explain high availability (HA) concepts: This domain addresses HA concepts including integrity methods, implementation approaches, and advantages of high availability configurations.
Topic 3
  • Explain the relationship between interfaces, trunks, VLANs, self-IPs, routes and
Topic 4
  • their status
  • statistics: This domain covers BIG-IP networking components including interfaces, trunks, VLANs, self-IPs, and routes, their dependencies and status, plus predicting traffic paths and egress IPs.

F5 BIG-IP Administration Data Plane Concepts (F5CAB2) Sample Questions (Q22-Q27):

NEW QUESTION # 22
A BIG-IP Administrator has a cluster of devices.
What should the administrator do after creating a new Virtual Server on device 1? (Choose one answer)

Answer: C

Explanation:
Comprehensive and Detailed Explanation (BIG-IP Administration - Data Plane Concepts):
In a BIG-IP device service cluster, configuration objects such as virtual servers, pools, profiles, and iRules are maintained through configuration synchronization (config-sync).
Key BIG-IP concepts involved:
Device Service Cluster (DSC)
A cluster is a group of BIG-IP devices that share configuration data. One device is typically used to make changes, which are then synchronized to the rest of the group.
Config-Sync Direction Matters
Changes are made on a local device
Those changes must be pushed to the group
The correct operation is "Sync Device to Group"
Why C is correct:
The virtual server was created only on device 1
Other devices in the cluster do not yet have this object
To propagate the new virtual server to all cluster members, the administrator must synchronize device 1 to the group Why the other options are incorrect:
A . Synchronize the settings of the group to device 1
This would overwrite device 1's configuration with the group's existing configuration and may remove the newly created virtual server.
B . Create a new cluster on device 1
The cluster already exists. Creating a new cluster is unnecessary and disruptive.
D . Create a new virtual server on device 2
This defeats the purpose of centralized configuration management and risks configuration drift.
Conclusion:
After creating a new virtual server on a BIG-IP device that is part of a cluster, the administrator must synchronize the configuration from that device to the group so all devices share the same ADC application objects.


NEW QUESTION # 23
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: B

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 # 24
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)

Answer: D

Explanation:
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.


NEW QUESTION # 25
A BIG-IP system receives UDP traffic from a specific source. The administrator wants the traffic to be forwarded, not dropped or rejected. Which virtual server type should be used? (Choose one answer)

Answer: A

Explanation:
Comprehensive and Detailed Explanation From BIG-IP Administration Data Plane Concepts documents:
BIG-IP virtual server types define how traffic is handled at the data plane when it matches a virtual server's destination address and service port.
According to BIG-IP Administration Data Plane Concepts:
Standard virtual server
The default and most commonly used type
Accepts client connections and forwards traffic to pool members
Supports both TCP and UDP traffic
Allows full use of profiles (UDP, FastL4, persistence, etc.) and iRules Required when the goal is to process and pass traffic through BIG-IP Drop virtual server Silently discards matching traffic No response is sent to the client Reject virtual server Actively rejects traffic by sending an error response For UDP, BIG-IP may send an ICMP unreachable message Block virtual server Used to block traffic at the virtual server level Traffic is neither forwarded nor processed by pools In this scenario:
The administrator explicitly wants the UDP traffic to be forwarded
Only a Standard virtual server forwards traffic to a pool or next-hop destination Why the Other Options Are Incorrect:
A . Drop - Traffic is silently discarded
B . Reject - Traffic is actively rejected
C . Block - Traffic is blocked and not forwarded
Key Data Plane Concept Reinforced:
When traffic must be accepted and forwarded-regardless of whether it is TCP or UDP-the BIG-IP administrator must use a Standard virtual server, which is the only virtual server type designed for normal application traffic processing.


NEW QUESTION # 26
Which of the following lists the order of preference from most preferred to least preferred when BIG-IP processes and selects a virtual server? (Choose one answer)

Answer: C

Explanation:
The BIG-IP system uses a specific precedence algorithm to determine which virtual server (listener) should process an incoming packet when multiple virtual servers might match the criteria. Since BIG-IP version 11.3.0, the system evaluates three primary factors in a fixed order of importance:
Destination Address: The system first looks for the most specific destination match. A "Host" address (mask /32) is preferred over a "Network" address (mask /24, /16, etc.), which is preferred over a "Wildcard" (0.0.0.0/0).
Source Address: If multiple virtual servers have identical destination masks, the system then evaluates the source address criteria. Again, a specific source host match is preferred over a source network or a wildcard source.
Service Port: Finally, if both destination and source specifications are equal, the system checks the port. A specific port match (e.g., 80) is preferred over a wildcard port (e.g., or 0).
Following this logic, a virtual server configured with a specific destination host, a specific source host, and a specific service port represents the highest level of specificity and thus the highest preference.


NEW QUESTION # 27
......

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