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| Certification Vendor: | F5 |
|---|---|
| Exam Name: | BIG-IP Administration Data Plane Concepts |
| Exam Number: | F5CAB2 |
| Related Certifications: | F5 Certified Administrator, BIG-IP (F5-CA) |
| Exam Format: | Multiple Choice, Scenario-based |
| Exam Price: | $50 USD |
| Passing Score: | Pass/Fail (Scaled scoring, specific threshold not publicly disclosed per sub-exam) |
| Available Languages: | English |
| Real Exam Qty: | 30 |
| 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 # 18
A BIG-IP Administrator is informed that traffic on interface 1.1 is expected to increase beyond the maximum bandwidth capacity of the link. There is a single VLAN on the interface.
What should the BIG-IP Administrator do to increase the total available bandwidth? (Choose one answer)
Answer: A
Explanation:
Comprehensive and Detailed Explanation (BIG-IP Administration - Data Plane Concepts):
On BIG-IP systems, physical interface bandwidth is fixed by the link speed (for example, 1GbE or 10GbE). When traffic demand exceeds the capacity of a single interface, BIG-IP provides link aggregation through trunks.
Key concepts involved:
Interfaces
A single physical interface (such as 1.1) is limited to its negotiated link speed. You cannot exceed this capacity through software tuning alone.
Trunks (Link Aggregation)
A trunk combines multiple physical interfaces into a single logical interface.
BIG-IP supports LACP and static trunks.
Traffic is distributed across member interfaces, increasing aggregate bandwidth and providing redundancy.
VLANs are then assigned to the trunk, not directly to individual interfaces.
Why option B is correct:
Creating a trunk with two interfaces allows BIG-IP to use both physical links simultaneously.
This increases total available bandwidth (for example, two 10Gb interfaces β up to 20Gb aggregate capacity).
This is the documented and supported method for scaling bandwidth on BIG-IP.
Why the other options are incorrect:
A . Increase the MTU
MTU changes affect packet size and efficiency, not total bandwidth capacity.
C . Assign two interfaces to the VLAN
BIG-IP does not support assigning a VLAN to multiple interfaces directly. VLANs must be associated with one interface or one trunk.
D . Set the media speed manually
Media speed can only be set up to the physical capability of the interface and connected switch port. It cannot exceed the hardware limit.
Conclusion:
To increase total available bandwidth on BIG-IP when a single interface is insufficient, the administrator must create a trunk object with multiple interfaces and move the VLAN onto the trunk. This aligns directly with BIG-IP data plane design and best practices.
NEW QUESTION # 19
A BIG-IP system receives a client connection destined to 1.0.0.10:8080. Multiple virtual servers are configured on the system. Which virtual server will process the connection? (Choose one answer)
Answer: A
Explanation:
Comprehensive and Detailed Explanation From BIG-IP Administration Data Plane Concepts documents:
BIG-IP uses a virtual server matching and precedence algorithm to determine which virtual server processes an incoming connection. This decision is made entirely in the data plane and is based on how specifically a virtual server matches the destination IP address and port.
BIG-IP Virtual Server Selection Rules (Simplified):
When multiple virtual servers could match a packet, BIG-IP selects the most specific match, using the following precedence:
Exact IP address and exact port
Exact IP address with wildcard port (port 0 / any)
Wildcard IP address with exact port
Wildcard IP address and wildcard port
Applying the Rules to This Scenario:
Incoming traffic destination: 1.0.0.10:8080
Option C: 1.0.0.10:8080
Exact IP match
Exact port match
Highest possible specificity
If the virtual server is available (green), it wins the match
Option B: 1.0.0.10:any
Exact IP match, but wildcard port
Lower priority than an exact IP + exact port match
Option D: 0.0.0.0:8080
Wildcard IP, exact port
Lower priority than an exact IP match
Option A: 0.0.0.0:any
Wildcard IP and wildcard port
Lowest priority, used only if no more specific virtual server exists
Final Determination:
Because a virtual server configured with destination 1.0.0.10:8080 exactly matches both the IP address and port of the incoming connection-and is available-it will always be selected to process the traffic.
Key Data Plane Concept Reinforced:
BIG-IP always processes traffic using the most specific matching virtual server. Exact destination IP and port matches take precedence over any wildcard or forwarding virtual server definitions.
NEW QUESTION # 20
Which event is always triggered when a client initially connects to a virtual server configured with an HTTP profile?
Answer: B
Explanation:
The BIG-IP processing flow follows a specific sequence of events as a packet moves through the system.
* TCP Handshake: Before any application-layer data (like HTTP) can be processed, a TCP connection must be established.
* The First Event: The very first event triggered when a client completes the 3-way handshake with the virtual server is CLIENT_ACCEPTED.
* Profile Influence: Even if an HTTP profile is attached, the system must first "accept" the connection at the protocol level. HTTP_REQUEST only triggers after the client sends data that the BIG-IP recognizes as a valid HTTP request. If a client connects but never sends a request, CLIENT_ACCEPTED will have fired, but HTTP_REQUEST will not.
NEW QUESTION # 21
A BIG-IP Administrator has acluster of devices.
What should the administrator doafter creating a new Virtual Server on device 1? (Choose one answer)
Answer: D
Explanation:
In a BIG-IPdevice service cluster, configuration objects such asvirtual servers, pools, profiles, and iRules are maintained throughconfiguration 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 alocal device
* Those changes must bepushed to the group
* The correct operation is"Sync Device to Group"
WhyCis correct:
* The virtual server was createdonly 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 mustsynchronize device 1 to the group Why the other options are incorrect:
* A. Synchronize the settings of the group to device 1This would overwrite device 1's configuration with the group's existing configuration and mayremove the newly created virtual server.
* B. Create a new cluster on device 1The cluster already exists. Creating a new cluster is unnecessary and disruptive.
* D. Create a new virtual server on device 2This 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 groupso all devices share the same ADC application objects.
NEW QUESTION # 22
The network architecture for a BIG-IP consists of an external VLAN and an internal VLAN with two interfaces connected to the upstream switch. The design requires fault tolerance in the case that one of the interfaces is down. Which deployment architecture meets these requirements? (Choose one answer)
Answer: D
Explanation:
Comprehensive and Detailed Explanation From BIG-IP Administration Data Plane Concepts documents:
To meet the requirement of fault tolerance when one interface goes down, BIG-IP must use link aggregation so that loss of a single physical link does not isolate the VLAN(s).
How the objects relate (data plane view)
Interfaces = physical links.
Trunk (LACP) = bundles multiple interfaces into one logical link that provides redundancy (and possibly bandwidth aggregation).
VLANs are assigned to interfaces or trunks. If you need multiple VLANs on the same trunk, they must use 802.1Q tagging (because you can only have one untagged VLAN per interface/trunk).
Self IPs are then placed on the VLANs to provide BIG-IP presence and routing/ARP functions, but self IPs are not what provides link resiliency-the trunk does.
Why Option D is correct
You have two physical interfaces and you want resiliency if one fails β put both interfaces into one trunk with LACP enabled.
You need both external and internal VLANs on those same two links β both VLANs should be configured as tagged on that trunk, so they can coexist on the same aggregated link.
If either physical interface fails, the trunk remains up via the remaining interface, keeping both VLANs operational.
Why the other options are incorrect
A: Two VLANs cannot both be untagged on the same trunk/interface. Only one untagged VLAN is possible; additional VLANs must be tagged.
B: Two trunks "each with one VLAN" would typically mean splitting VLANs across separate trunks. With only two interfaces total, that becomes one interface per trunk-if one interface goes down, the VLAN on that interface is down (no redundancy for that VLAN).
C: Same redundancy problem as B, and disabling LACP removes the negotiated aggregation behavior expected when the switch engineer specifically requested LACP.
NEW QUESTION # 23
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