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| Section | Weight | Objectives |
|---|---|---|
| Topic 1: Modify and Manage Virtual Servers | 50% | - Apply persistence profiles - Configure encryption and protocol profiles - Verify pool configurations associated with virtual servers - Identify and work with iApp objects and iRules - Configure and modify virtual server properties |
| Topic 2: Modify and Manage Pools | 50% | - Set priority groups and service port configurations - Configure load balancing methods - Configure and modify pool settings - Implement health monitors for pools |
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NEW QUESTION # 56
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: D
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_OPTIMIZEDA 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 192.168.10.0/24The 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 # 57
Some users who connect to a busy Virtual Server have connections reset by the BIG-IP system. Pool member resources are NOT a factor.
What is a possible cause?
Answer: A
Explanation:
When the connection limit is reached, BIG-IP resets new connections, even if pool members are healthy.
NEW QUESTION # 58
Which type of Virtual Server requires the use of a FastL4 profile?
Answer: A
Explanation:
Performance (Layer 4) virtual servers rely on FastL4 profiles to provide high-speed L4 processing without full proxy overhead.
Below is BATCH 2 (next 10 questions) extracted only from your uploaded document that are clearly related to BIG-IP Administration: Data Plane Configuration topics.
#As requested, I have strictly excluded questions related to:
* Licensing
* HA / Device Trust / Sync-only
* Logging destinations
* User roles
* Hardware, EUD, support processes
* System-only administration
Source: Your uploaded TMOS Administration v2.0 document
NEW QUESTION # 59
Where in the configuration utility should the BIG-IP Administrator verify the pool member currently assigned to a pool is on port 80?
Answer: B
Explanation:
The BIG-IP Configuration Utility (GUI) organizes information hierarchically to allow for granular management of application objects. A Pool is a collection of backend servers (pool members) that provide the same service. To verify the specific network parameters-such as the IP address and the service port-of the servers within a pool, the administrator must navigate to the specific pool's configuration.
The standard procedural path to verify this is Local Traffic > Pools: Pool List, where the administrator selects the specific pool name. Once inside the pool's configuration, the Members tab displays a list of all IP addresses and service ports associated with that pool. Under the "Service Port" column, the administrator can confirm if the member is listening on port 80 (HTTP).
Options A and B are incorrect for this specific verification task. While Nodes (Option A) show the health of a physical server, a node represents only an IP address and does not have a "Service Port" associated with it until it is defined as a pool member. Verifying the Health Monitor (Option B) would tell the administrator how the system is checking the member's status, but it does not definitively show the port on which the member is actually receiving application traffic. In a BIG-IP environment, a pool member is uniquely identified by the combination of its Node IP and its Service Port, and the Members tab is the primary interface for managing and auditing these specific member attributes.
NEW QUESTION # 60
A BIG-IP Administrator creates an HTTP Virtual Server using an iApp template. After the Virtual Server is created, the user requests to change the destination IP addresses. The BIG-IP Administrator tries to change the destination IP address from 10.1.1.1 to 10.2.1.1 in Virtual Server settings, but receives the following error:
"The application service must be updated using an application management interface." What is causing this error?
Answer: B
Explanation:
In F5 BIG-IP administration, iApps are designed to manage complex application configurations as a single unit. When an iApp is deployed, it creates an "Application Service" object that owns all the associated LTM objects, such as Virtual Servers, Pools, and Nodes. By default, these iApps are created with Strict Updates enabled. Strict Updates is a safety mechanism that prevents administrators from making manual "out-of-band" changes to the individual objects created by the iApp. The system enforces this because manual changes would be overwritten the next time the iApp template is updated or re-entered.
When the administrator attempts to change the destination IP address directly on the Virtual Server object, the BIG-IP system checks the "Strict Updates" flag. If it is set to "Enabled," the system blocks the modification and generates the error message stating the service must be updated via the application management interface.
To resolve this, the administrator must navigate to the iApp >> Application Services menu, select the specific application service, and go to the "Reconfigure" tab. Within the iApp configuration form, the destination IP can be safely changed. Alternatively, if the administrator specifically wants to manage the objects manually and forgo the benefits of the iApp template management, they could disable "Strict Updates" in the iApp properties, though this is generally discouraged as it breaks the template's logic. The error is not related to subnetting or duplicate IPs, but strictly to the configuration authority assigned to the iApp service.
NEW QUESTION # 61
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