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| Certification Vendor: | F5 Networks |
|---|---|
| Exam Name: | BIG-IP Administration Data Plane Configuration |
| Exam Number: | F5CAB3 |
| Exam Duration: | 30 minutes |
| Real Exam Qty: | 30 |
| Related Certifications: | BIG-IP Administration Support and Troubleshooting (F5CAB5) BIG-IP Administration Control Plane Administration (F5CAB4) BIG-IP Administration Install, Initial Configuration, and Upgrade (F5CAB1) BIG-IP Administration Data Plane Concepts (F5CAB2) |
| Passing Score: | 245 |
| Available Languages: | English |
| Certificate Validity Period: | 3 years |
| Exam Price: | USD 50 (Online), USD 65 (Test Center) |
| Exam Format: | Multiple Choice, Scenario-based |
| Recommended Training: | F5 Certified Administrator BIG-IP Blueprint Administering BIG-IP Training Course |
| Exam Registration: | Pearson VUE Certiverse 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 1 |
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| Topic 2 |
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NEW QUESTION # 57
Refer to the exhibit.
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? (Choose one answer)
Answer: C
Explanation:
SSH is a Layer 4 TCP-based protocol that operates on TCP port 22 and does not use HTTP in any capacity. In the exhibit, the Virtual Server is configured with an HTTP Profile applied, which is inappropriate for SSH traffic and causes connection failures.
According to the BIG-IP Administration: Data Plane Configuration documentation:
An HTTP profile must only be applied to Virtual Servers handling HTTP or HTTPS traffic.
When an HTTP profile is attached, BIG-IP expects HTTP headers and attempts to parse application-layer data.
Non-HTTP protocols such as SSH, FTP (control), SMTP, and other raw TCP services will fail if an HTTP profile is enabled.
Why the other options are incorrect:
A . Set Protocol to UDP
SSH uses TCP, not UDP. Changing the protocol would break SSH entirely.
B . Set Source Address to 10.1.1.2
The source address setting controls client access restrictions and is unrelated to protocol parsing issues.
C . Set Destination Address/Mask to 0.0.0.0/0
The destination address is already valid for a specific SSH service and does not impact protocol handling.
Correct Resolution:
The BIG-IP Administrator should remove the HTTP Profile (set it to None) so the Virtual Server functions as a pure Layer 4 TCP service, allowing SSH connections to pass through successfully.
NEW QUESTION # 58
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 192.168.101.100 and 192.168.101.200 and target
192.168.21.50 .
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?
Answer: A
Explanation:
The virtual server is configured for destination 192.168.21.50 , service port 53 , but its Protocol is TCP .
Standard DNS query traffic is normally sent using UDP port 53 . Because virtual-server traffic matching includes the configured IP protocol, UDP DNS packets will not match a virtual server configured exclusively for TCP, causing the queries to fail.
F5 ' s DNS configuration guidance explicitly instructs administrators creating a DNS query virtual server to configure service port 53 and select UDP as the protocol. F5 also recommends separate TCP and UDP virtual servers when both forms of DNS traffic must be supported; TCP port 53 is particularly relevant for operations such as DNS zone transfers.
Option C is not required. The existing source network 192.168.100.0/23 spans addresses from 192.168.100.0 through 192.168.101.255, so both 192.168.101.100 and 192.168.101.200 are already permitted by the source- address criterion. F5 documents that the Source Address setting can specify the network from which a virtual server accepts traffic.
Therefore, changing the virtual server ' s Protocol from TCP to UDP corrects the traffic-matching problem.
Reference Topics: Virtual Server traffic matching; Protocol selection; DNS over UDP/TCP; Source Address matching; Service Port 53.
NEW QUESTION # 59
Which two load balancing methods consider all the connections the BIG-IP has between it and each backend application server (Pool Member) when making a load balancing decision for a new connection?
Answer: A,D
Explanation:
The two load balancing methods that consider all connections between the BIG-IP and each backend node
- not just connections to a specific pool member - are Least Connections (node) and Weighted Least Connections (node) .
The critical distinction here lies in the node-level scope of evaluation. A node represents the backend server ' s IP address, regardless of how many services or ports it may be serving. Therefore:
* Least Connections (node) directs new connections to the node with the fewest total active connections across all services on that server, providing a holistic connection-count perspective.
* Weighted Least Connections (node) operates identically but factors in an administrator-defined ratio weight, allowing servers with greater capacity to proportionally absorb more connections while still evaluating total node-level connection counts.
By contrast:
* Ratio (member) distributes traffic based on a static weight ratio and does not dynamically evaluate current connection counts.
* Round Robin distributes traffic sequentially in rotation, completely ignoring current connection states on any node or member.
The node-based methods are particularly valuable in environments where a single backend server hosts multiple pool members across different ports, ensuring the server ' s overall load - not just per-service load
- governs balancing decisions.
Reference: BIG-IP Administration - Data Plane Configuration, Module: Load Balancing Methods - Member vs. Node Scope.
NEW QUESTION # 60
A BIG-IP Administrator adds new pool members to a highly utilized pool. The application begins failing.
What pool-level setting should be checked?
Answer: C
Explanation:
Slow Ramp Time prevents new members from being overwhelmed immediately after activation.
NEW QUESTION # 61
All pool members are online. All other virtual server settings are at default.
What might alter the load balancing behavior? (Choose one answer)
Answer: C
Explanation:
By default, BIG-IP load balancing algorithms (such as Round Robin) distribute connections evenly across all available pool members. However, persistence profiles override normal load balancing decisions by forcing subsequent connections from a client to be sent to the same pool member.
According to the BIG-IP Administration: Data Plane Configuration documentation:
Persistence creates a client-to-server mapping that is honored before load balancing algorithms are applied.
When persistence is enabled, BIG-IP may repeatedly select the same pool member even if others are available.
This directly alters load balancing behavior.
Why the other options are incorrect:
A . Adding a OneConnect profile
OneConnect optimizes server-side TCP connections but does not change which pool member is selected.
B . Enabling SNAT automap
SNAT affects source address translation, not pool member selection.
C . Enabling a fallback host in the HTTP profile
A fallback host is only used when no pool members are available.
Correct Resolution:
Adding a persistence profile alters load balancing behavior by maintaining client affinity to a specific pool member.
NEW QUESTION # 62
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