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| Certification Vendor: | F5 Networks |
|---|---|
| Exam Name: | BIG-IP Administration Data Plane Configuration |
| Exam Number: | F5CAB3 |
| Real Exam Qty: | 30 |
| Related Certifications: | BIG-IP Administration Install, Initial Configuration, and Upgrade (F5CAB1) BIG-IP Administration Control Plane Administration (F5CAB4) BIG-IP Administration Data Plane Concepts (F5CAB2) BIG-IP Administration Support and Troubleshooting (F5CAB5) |
| Exam Duration: | 30 minutes |
| Exam Format: | Multiple Choice, Scenario-based |
| Certificate Validity Period: | 3 years |
| Exam Price: | USD 50 (Online), USD 65 (Test Center) |
| Available Languages: | English |
| Passing Score: | 245 |
| Recommended Training: | F5 Certified Administrator BIG-IP Blueprint Administering BIG-IP Training Course |
| Exam Registration: | Certiverse F5 Education Pearson VUE |
| Sample Questions: | F5 F5CAB3 Sample Questions |
| Exam Way: | Online proctored (Certiverse) / Test center proctored (Pearson VUE) |
| Pre Condition: | No formal prerequisites; recommended basic understanding of BIG-IP system and networking concepts |
| Official Syllabus URL: | https://education.f5.com/certification/big-ip-administration-data-plane-configuration-f5cab3 |
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| Topic | Details |
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| Topic 2 |
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NEW QUESTION # 64
A Standard Virtual Server reports poor network performance for Internet-based clients.
What configuration should be applied?
Answer: B
Explanation:
WAN TCP profiles are optimized for high latency and packet loss typical of Internet clients, while LAN profiles are ideal for backend servers.
NEW QUESTION # 65
Refer to the exhibit.
DNS queries from two internal DNS servers are being load-balanced to external DNS servers via a virtual server on a BIG-IP device. The DNS queries originate from:
192.168.10.100
192.168.10.200
and target:
192.168.2.150
All DNS queries destined for the external DNS servers fail.
Which property change should the BIG-IP Administrator make in the Virtual Server to resolve this issue? (Choose one answer)
Answer: C
Explanation:
DNS traffic is primarily transported using UDP port 53. In the exhibit, the Virtual Server is configured with the Protocol set to TCP, which prevents standard DNS queries from being processed correctly. BIG-IP Virtual Servers must be configured with the correct Layer 4 protocol to match the application traffic they are handling.
According to the BIG-IP Administration: Data Plane Configuration documentation:
The Protocol setting on a Virtual Server defines whether traffic is processed as TCP, UDP, or another supported transport protocol.
Standard DNS queries and responses use UDP, while TCP is only required for DNS zone transfers (AXFR) or exceptionally large responses.
When a DNS Virtual Server is incorrectly configured with TCP, UDP-based DNS queries are dropped, causing all requests to fail.
Why the other options are incorrect:
A . Protocol profile (Client) to DNS_OPTIMIZED
A DNS profile enhances DNS functionality but does not correct an incorrect transport protocol configuration.
B . Type to Performance (HTTP)
Performance (HTTP) Virtual Servers are designed for HTTP traffic and are not suitable for DNS services.
C . Source Address to 192.168.10.0/24
The existing source IPs already fall within the allowed range, so this setting does not address the failure.
Correct Resolution:
Changing the Protocol to UDP aligns the Virtual Server with standard DNS transport requirements, allowing DNS queries to be successfully processed and load-balanced.
NEW QUESTION # 66
A BIG-IP Administrator creates a new VLAN on BIG-IP Cluster Member A and attaches an interface to it.
Although the Auto Config Sync is in place, the new VLAN does NOT show up on Cluster Member B. What should the BIG-IP Administrator do to ensure the new VLAN is configured on each Cluster Member?
Answer: A
Explanation:
In a BIG-IP High Availability (HA) environment, most configuration objects (Virtual Servers, Pools, iRules) are considered " shared " and are synchronized automatically between devices. However, network-level objects-specifically VLANs and Self IPs-are unique to the hardware and are generally not synchronized by the ConfigSync process.
This is intentional because two devices in a cluster may have different physical cabling or interface assignments. For example, Cluster Member A might use interface 1.1 for a specific VLAN, while Cluster Member B might use interface 1.2. Because the BIG-IP system cannot assume that the physical network topology is identical for both appliances, the administrator must Configure the new VLAN manually on Cluster Member B.
Once the VLAN is created manually on both devices with the exact same name, it can then be used to host " shared " floating Self IP addresses or traffic groups that will synchronize. Failing to create the VLAN on the peer device will prevent the traffic group from failing over correctly, as the peer will not have the necessary Layer 2 broadcast domain defined to take over the traffic. Resetting Device Trust (Option D) is a drastic step for fix sync communication issues but will not change the fact that VLANs are non-syncable objects.
Enabling the interface (Option B) only affects the link status of Member A and has no impact on the configuration of Member B.
NEW QUESTION # 67
A virtual server is configured to offload SSL from a pool of backend servers. When users connect to the virtual server, they successfully establish an SSL connection but no content is displayed. A packet trace performed on the server shows that the server receives and responds to the request. What should a BIG-IP Administrator do to resolve the problem?
Answer: C
Explanation:
This scenario describes a classic routing issue often encountered during SSL offload deployments. The fact that an SSL connection is established indicates the Client SSL profile is working correctly. The packet trace showing the server "receives and responds" to the request is the most critical diagnostic clue.
When a BIG-IP receives traffic, it typically passes the client's original source IP address to the backend server. If the backend server's default gateway is not the BIG-IP (a common "one-arm" network topology), the server will attempt to send its response directly back to the client's IP via its own default router. The client's browser will reject this response because it expects traffic to come from the Virtual Server's IP, not the backend server's IP.
To resolve this, the administrator must enable SNAT (Source Address Translation), typically using SNAT Automap. When SNAT is enabled, the BIG-IP replaces the client's original source IP with one of its own Self IPs before forwarding the request to the server. Because the source of the packet is now the BIG-IP, the backend server is forced to send its response back to the BIG-IP. The BIG-IP then receives the response, translates it back, and delivers the content to the user. Option A is unnecessary if the servers are expecting plain-text traffic after the BIG-IP performs offload. Option D would only worsen the existing routing discrepancy.
NEW QUESTION # 68
Local Traffic Network Map: VS_HTTP # POOL_WEB # 192.168.212.30:80 Pool Member | Parent Node
192.168.212.30 Port 80
Why is the virtual server unresponsive to incoming connections?
Answer: C
Explanation:
In the BIG-IP object hierarchy, a Pool Member is a child object of a Node . A pool member represents a specific IP:Port combination, while the parent node represents the underlying server IP address. When a node is disabled , all pool members that are children of that node are rendered unavailable - regardless of the individual pool member ' s own health or enabled state.
The Network Map depicted shows the pool member (192.168.212.30:80) with its Parent Node (192.168.212.30) disabled. This parent-child dependency means that even if the pool member itself is healthy and enabled, the disabled node cascades its unavailable state downward, causing the pool to have no available members and rendering VS_HTTP unresponsive to incoming connections.
The other options can be eliminated as follows:
* Pool member monitor failed - the monitor status is not indicated as failed in the Network Map display.
* Pool member is disabled - the pool member itself is not shown as disabled; the parent node is.
* Node monitor failed - no monitor failure is indicated; the node ' s administrative state is explicitly disabled.
Understanding the node-to-member inheritance of availability state is fundamental to accurate BIG-IP traffic troubleshooting.
Reference: BIG-IP Administration - Data Plane Configuration, Module: Pool Members, Nodes, and Availability State Inheritance.
NEW QUESTION # 69
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