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| Certification Vendor: | F5 |
|---|---|
| Exam Name: | BIG-IP Administration Data Plane Concepts |
| Exam Number: | F5CAB2 |
| Passing Score: | Pass/Fail (Scaled scoring, specific threshold not publicly disclosed per sub-exam) |
| Real Exam Qty: | 30 |
| Exam Price: | $50 USD |
| Exam Format: | Multiple Choice, Scenario-based |
| Related Certifications: | F5 Certified Administrator, BIG-IP (F5-CA) |
| Available Languages: | English |
| 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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NEW QUESTION # 17
Which of the following lists theorder of preference from most preferred to least preferredwhen BIG-IP processes and selects avirtual server? (Choose one answer)
Answer: A
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 specificdestination host, a specificsource host, and a specificservice portrepresents the highest level of specificity and thus the highest preference.
NEW QUESTION # 18
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: A
Explanation:
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 # 19
A network administrator is planning to add a trunk to a single BIG-IP system. What does a trunk provide? (Pick the 2 correct responses below)
Answer: C,D
Explanation:
In the F5 BIG-IP ecosystem, a trunk is a logical grouping of two or more physical interfaces that the system treats as a single data path. This configuration is based on the Link Aggregation Control Protocol (LACP) or static link aggregation.
Trunks provide two primary benefits to the data plane:
Increased Bandwidth: By aggregating multiple physical interfaces (e.g., combining two 10Gbps interfaces), the aggregate throughput of the logical connection is increased. This allows the BIG-IP to handle higher traffic volumes than a single interface could support.
Link Redundancy: Trunks provide high availability at the physical layer. If one physical interface within the trunk fails or the cable is disconnected, the BIG-IP system automatically redistributes traffic across the remaining active interfaces in the trunk. This prevents a single cable or port failure from causing a network outage.
Why the other options are incorrect:
Option C: While VLAN tags are often used on trunks, the ability to use tagged VLANs is a property of the VLAN configuration and 802.1Q tagging, not the trunk itself. A single interface can support tagged VLANs without being part of a trunk.
Option D: Trunks are agnostic to the type of application traffic (such as VoIP) passing through them. They operate at Layer 2 to provide a reliable pipe for any Layer 3+ traffic.
NEW QUESTION # 20
A BIG-IP Administrator configures remote authentication and needs to ensure that users can still log in even when the remote authentication server is unavailable. Which action should the BIG-IP Administrator take in the remote authentication configuration to meet this requirement? (Choose one answer)
Answer: C
Explanation:
Although remote authentication (LDAP, RADIUS, TACACS+) is a control-plane / management-plane feature, it directly affects availability and resiliency of administrative access, which is a critical operational HA consideration.
How BIG-IP Remote Authentication Works:
BIG-IP can authenticate administrators against:
LDAP
RADIUS
TACACS+
When remote authentication is enabled, BIG-IP by default relies on the remote server for user authentication If the remote authentication server becomes unreachable, administrators may be locked out unless fallback is configured Why "Fallback to Local" Is Required:
The Fallback to Local option allows BIG-IP to:
Attempt authentication against the remote authentication server first
If the remote server is unreachable or unavailable, fall back to:
Local BIG-IP user accounts (admin, or other locally defined users)
This ensures:
Continuous administrative access
Safe recovery during:
Network outages
Authentication server failures
Maintenance windows
This behavior is explicitly recommended as a best practice in BIG-IP administration to avoid loss of management access.
Why the Other Options Are Incorrect:
A . Configure a second remote user directory
Provides redundancy only if both directories are reachable
Does not help if remote authentication as a whole is unavailable
B . Configure a remote role group
Maps remote users to BIG-IP roles
Does not affect authentication availability
D . Set partition access to "All"
Controls authorization scope after login
Has no impact on authentication success
Key Availability Concept Reinforced:
To maintain administrative access resiliency, BIG-IP administrators should always enable Fallback to Local when using remote authentication. This prevents lockouts and ensures access even during authentication infrastructure failures.
NEW QUESTION # 21
Refer to the exhibit.
The BIG-IP Administrator needs to avoid overloading any of the pool members with connections when they become active. What should the BIG-IP Administrator configure to meet this requirement? (Choose one answer)
Answer: B
Explanation:
This question focuses on connection behavior when pool members transition from down to up, which is a classic data plane consideration in BIG-IP environments.
What problem is being solved?
When a pool member:
* Recovers from a failure
* Is enabled after maintenance
* Transitions from inactive to active
...it can suddenly receive a large burst of new connections, especially when using load-balancing methods such as Least Connections. This sudden surge can overload the server.
Why Slow Ramp Time is the correct solution:
Slow Ramp Time is a pool-level setting that:
* Gradually increases the number of connections sent to a newly available pool member
* Prevents sudden spikes in traffic
* Allows the server to warm up (application cache, JVM, DB connections, etc.) From BIG-IP Administration Data Plane Concepts:
* Slow Ramp Time controls the rate at which BIG-IP increases load to a pool member that has just become available
* During the ramp period, BIG-IP artificially increases the member's connection count, making it appear
"busier" and therefore less attractive for new connections
This directly satisfies the requirement to avoid overloading pool members when they become active.
Why the Other Options Are Incorrect:
* B. Different Ratio for each member
* Ratios control relative distribution under normal operation
* They do not prevent a sudden surge when a member becomes active
* C. Action On Service Down to Reselect
* Controls persistence behavior when a member goes down
* Has no impact on connection ramp-up when a member comes back online
* D. Same Priority Group to each member
* Affects failover logic between priority groups
* Does not control connection rate or ramp-up behavior
Key Data Plane Concept Reinforced:
To protect backend servers during recovery events, BIG-IP provides Slow Ramp Time, ensuring graceful reintroduction of traffic and preventing connection storms that can occur during high-load scenarios.
NEW QUESTION # 22
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