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| Certification Vendor: | F5 Networks |
|---|---|
| Exam Name: | F5 Certified BIG-IP Administrator: Data Plane Configuration |
| Exam Number: | F5CAB3 |
| Passing Score: | 247 out of 350 (approximately 70%) |
| Exam Duration: | 120 minutes |
| Exam Price: | $160 USD |
| Certificate Validity Period: | 2 years |
| Real Exam Qty: | 60-80 |
| Related Certifications: | F5 Certified Specialist, Data Plane Configuration F5 Certified BIG-IP Administrator (F5-CA) |
| Exam Format: | Build List, Multiple Select, Multiple Choice |
| Available Languages: | English |
| Sample Questions: | F5 F5CAB3 Sample Questions |
| Exam Way: | Online proctored or test center |
| Pre Condition: | Recommended: F5 Certified Administrator certification or equivalent experience with BIG-IP LTM |
| Official Syllabus URL: | https://www.f5.com/go/certification |
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NEW QUESTION # 76
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 addresses
Increasing timeouts may actually worsen the problem by keeping ports allocated longer, accelerating port exhaustion.
B . Remove the SNAT pool and apply SNAT Automap
SNAT 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 pool
This 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 # 77
Refer to the exhibit.
A BIG-IP Administrator needs to configure health monitors for a newly configured server pool named Pool_B. Which health monitor settings will ensure that all pool members will be accurately marked as available or unavailable?
Answer: B
Explanation:
The pool member list in the exhibit shows servers listening on four distinct service ports: 80 (HTTP), 21 (FTP), 443 (HTTPS), and 22 (SSH). To accurately monitor a pool where members provide different services, the administrator must apply monitors that correspond to each of those specific services.
The key to this configuration is the Availability Requirement (also known as "Monitor Rule"). If the administrator sets the requirement to "All health monitors," every single monitor (HTTP, HTTPS, FTP, and SSH) must pass for a member to be marked "Up." This would cause an immediate failure: for example, a server listening only on port 80 would fail the HTTPS, FTP, and SSH checks, resulting in the member being marked "Down" even if the HTTP service is healthy.
To ensure accuracy, the administrator should apply all four relevant monitors and set the Availability Requirement to at least one monitor. With this setting, the BIG-IP marks a member as "Up" if any of the assigned monitors return a successful response. Therefore, the member at 10.200.50.210:80 will stay "Up" as long as the HTTP monitor passes, even though it fails the FTP, HTTPS, and SSH monitors. This configuration allows a single pool to contain diverse service types while ensuring that the specific port defined for each member is verified correctly. Option C is incorrect because ICMP only checks if the IP is alive, not if the specific service port is functioning.
NEW QUESTION # 78
Application administrators are reporting that nodes different from those configured in the pool are selected.
The use of an iRule is suspected. How can the BIG-IP Administrator check if an iRule is used for this traffic?
(Pick the 2 correct responses below)
Answer: A,D
Explanation:
To determine if an iRule is influencing traffic for a specific Virtual Server, the administrator must verify the association between the Virtual Server object and any applied scripts. In the BIG-IP Configuration Utility (GUI), this association is found under the Resources tab of the specific Virtual Server. While there is an " iRules " sub-menu under Local Traffic, checking the Virtual Server ' s Resources tab is the definitive way to see which specific rules are currently active and in what order they are being processed for that particular traffic flow.
From the Command Line Interface (CLI), the tmsh list /ltm virtual < virtual_server > command provides a full text-based output of the virtual server ' s configuration. If iRules are applied, they will appear within a " rules { ... } " block in the command output. This is more effective than Option A, which only lists the contents of the iRule itself but does not show if or where it is applied. Option C is a common misconception; while some versions of the GUI have reorganized menus, the standard location for managing the association of profiles, policies, and iRules to a Virtual Server remains the " Resources " section. By identifying the applied iRule, an administrator can then review the script logic-often containing commands like pool or node-to see if it is overriding the default pool selection based on specific HTTP headers, URI paths, or client IP addresses.
NEW QUESTION # 79
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: D
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 UDPSSH uses TCP, not UDP. Changing the protocol would break SSH entirely.
* B. Set Source Address to 10.1.1.2The source address setting controls client access restrictions and is unrelated to protocol parsing issues.
* C. Set Destination Address/Mask to 0.0.0.0/0The 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 # 80
An organization reports slow performance accessing an Intranet website. All employees use a single proxy IP.
What should the BIG-IP Administrator do?
Answer: D
Explanation:
When many users share one source IP, source-address persistence fails. Cookie persistence uniquely identifies clients at Layer 7.
NEW QUESTION # 81
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