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| Certification Vendor: | F5 Networks |
|---|---|
| Exam Name: | BIG-IP Administration Data Plane Configuration |
| Exam Number: | F5CAB3 |
| Exam Price: | USD 50 (Online), USD 65 (Test Center) |
| Related Certifications: | BIG-IP Administration Data Plane Concepts (F5CAB2) BIG-IP Administration Install, Initial Configuration, and Upgrade (F5CAB1) BIG-IP Administration Support and Troubleshooting (F5CAB5) BIG-IP Administration Control Plane Administration (F5CAB4) |
| Real Exam Qty: | 30 |
| Certificate Validity Period: | 3 years |
| Exam Duration: | 30 minutes |
| Passing Score: | 245 |
| Exam Format: | Scenario-based, Multiple Choice |
| Available Languages: | English |
| Recommended Training: | F5 Certified Administrator BIG-IP Blueprint Administering BIG-IP Training Course |
| Exam Registration: | Certiverse Pearson VUE F5 Education |
| 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 # 36
In a pool there are 2 pool members (older servers) that can handle fewer connections than the other 3 newer servers.
Which load balancing method would allow more traffic to be directed to the newer servers? (Choose one answer)
Answer: C
Explanation:
This scenario requires unequal load distribution based on server capacity. The newer servers must receive more connections than the older ones, while still dynamically accounting for active connection counts.
According to BIG-IP Administration: Data Plane Configuration documentation:
Weighted Least Connections (member) combines:
Connection awareness (least connections)
Administrator-defined weights (ratios) to reflect server capacity
Pool members with higher weights receive proportionally more new connections than members with lower weights, even when using the same load balancing algorithm.
Why B is correct:
Allows assigning higher weights to newer servers and lower weights to older servers Ensures smarter traffic distribution based on both capacity and real-time load Why the other options are incorrect:
A . Global Availability
Used for disaster recovery and site failover, not intra-pool load distribution.
C . Round Robin
Distributes connections evenly without considering server capacity.
D . Least Connections (member)
Balances only by current connection count and does not account for differences in server performance or capacity.
Correct Resolution:
Use Weighted Least Connections (member) and assign higher weights to newer servers so they receive more traffic while protecting older servers from overload.
NEW QUESTION # 37
A BIG-IP Administrator creates a new Virtual Server to load balance SSH traffic. Users are unable to log on to the servers.
What should the BIG-IP Administrator do to resolve the issue?
Answer: C
Explanation:
SSH is a TCP Layer 4 protocol. Applying an HTTP profile causes BIG-IP to expect HTTP headers, breaking SSH sessions. Removing the HTTP profile allows raw TCP forwarding.
NEW QUESTION # 38
A BIG-IP Administrator uses backend servers to host multiple services per server. There are multiple virtual servers and pools defined, referencing the same backend servers. Which load balancing algorithm is most appropriate to have an equal number of connections on each backend server?
Answer: C
Explanation:
This question addresses the critical architectural distinction between "member-based" and "node-based" load balancing in environments where servers are multi-homed or host multiple virtualized services. On a BIG-IP, a node represents the underlying IP address of a physical or virtual server, while a pool member represents a specific combination of that IP and a service port (e.g., 10.1.1.10:80).
When multiple pools reference the same IP address across different ports or Virtual Servers, using Least Connections (member) (Option D) only balances connections relative to that specific pool. For example, if Pool_A and Pool_B both use Server_X, and Pool_A has 100 connections while Pool_B has only 5, a member- based algorithm for Pool_B only sees the 5 connections and may continue to send traffic there even if Server_X is CPU-saturated by Pool_A.
The Least Connections (node) algorithm (Option B) solves this by tracking the aggregate total of all active connections directed to that specific node (IP address) across every pool on the system. By selecting the node with the absolute lowest total connection count, the BIG-IP ensures a more equitable distribution of work at the hardware resource level. Predictive methods (Options A and C) use a ranking system based on the trend of connection counts over time, but for the specific requirement of maintaining an equal number of current connections on multi-service servers, the direct Least Connections (node) calculation is the standard and most effective procedural choice.
NEW QUESTION # 39
A BIG-IP Administrator finds the following log entry after a report of user issues connecting to a virtual server:
01010201: Intercept exhaustion on 10.70.110.112 to 192.28.123.250:80 (proto 6) How should the BIG-IP Administrator modify the SNAT pool that is associated with the virtual server?
(Choose one answer)
Answer: A
Explanation:
The log message "Intercept exhaustion" indicates that the BIG-IP system has exhausted the available source port translations for one or more SNAT addresses. This occurs when too many concurrent client connections are being translated through a limited number of SNAT IP addresses, and all ephemeral source ports (typically ~64,000 per SNAT IP) are in use.
According to the BIG-IP Administration: Data Plane Configuration documentation:
Each SNAT IP address provides a finite number of available source ports.
When the number of concurrent connections exceeds the available port space, the BIG-IP logs an Intercept exhaustion error and new connections fail.
The recommended resolution is to increase the available SNAT resources by adding additional IP addresses to the SNAT pool.
Why the other options are incorrect:
A). Increase the timeout of the SNAT addressesIncreasing timeouts may actually worsen the problem by keeping ports allocated longer, accelerating port exhaustion.
B). Remove the SNAT pool and apply SNAT AutomapSNAT Automap uses the Self IP addresses on the egress VLAN, which may not provide additional capacity and can introduce routing or design issues. This is not a direct or recommended fix for SNAT exhaustion.
C). Remove an IP address from the SNAT poolThis would reduce the number of available source ports and further exacerbate the intercept exhaustion condition.
Correct Resolution:
By adding an IP address to the SNAT pool, the BIG-IP increases the total number of available source ports, alleviating intercept exhaustion and restoring successful client connections.
NEW QUESTION # 40
In the BIG-IP Configuration Utility, a user requests a single screen view to determine the status of all Virtual Servers and associated pool members, as well as any iRules in use. Where should the BIG-IP Administrator instruct the user to find this view?
Answer: D
Explanation:
The Local Traffic > Network Map provides a single consolidated view within the BIG-IP Configuration Utility that displays the full relationship hierarchy of all application delivery objects simultaneously. This includes Virtual Servers, their associated Pools, individual Pool Members, applied iRules, profiles, and the health status of each object - all rendered in a single topological screen.
This view is specifically designed for administrators and users who need rapid situational awareness across the data plane without navigating multiple menu screens. Each object is colour-coded to reflect its current availability state (green = available, red = unavailable, yellow = degraded).
The alternative options do not satisfy all requirements:
* Local Traffic > Monitors only displays health monitor configurations, not virtual server or pool member relationships.
* Statistics provides performance counters and throughput data, not object relationship mapping.
* Local Traffic > Virtual Servers lists virtual server configurations individually but does not provide a unified topology view inclusive of pool members and iRules in a single screen.
The Network Map is the authoritative single-pane-of-glass tool for application object visibility on BIG-IP.
Reference: BIG-IP Administration - Data Plane Configuration, Module: Monitoring and Managing Application Traffic - Network Map.
NEW QUESTION # 41
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