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NEW QUESTION # 31
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: B
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 # 32
A BIG-IP Administrator creates a new Virtual Server. The end user is unable to access the page. During troubleshooting, the administrator learns that the connection between the BIG-IP system and server is NOT set up correctly. What should the administrator do to solve this issue? (Choose one answer)
Answer: D
Explanation:
The issue described is a classic symptom of asymmetric routing, which frequently occurs when the BIG-IP system and the back-end servers reside on the same subnet (often referred to as a "one-arm" deployment).
The Routing Problem: By default, the BIG-IP system preserves the original client source IP address when forwarding traffic to a pool member. If the server is in the same subnet as the client or if the server's default gateway is not the BIG-IP, the server will attempt to send its response directly back to the client's IP address, bypassing the BIG-IP.
Stateful Failure: Since the BIG-IP is a Full Proxy, it maintains a state table. Because the response packet never returns through the BIG-IP, the system cannot complete the three-way handshake or manage the application session, resulting in a connection failure for the user.
The Solution (SNAT): Enabling Source Network Address Translation (SNAT) solves this by changing the source IP address of the request to an IP address owned by the BIG-IP (typically a self-IP).
Requirement for Subnet Alignment: To ensure the server sends the response back to the BIG-IP, the translation address must be reachable. By using a self-IP configured in the same subnet as the servers, the BIG-IP ensures that the server sees the request coming from a local "neighbor." The server will then naturally send the response back to that self-IP, allowing the BIG-IP to translate the packet back and forward it to the client.
Why other options are incorrect:
A: Disabling address translation would ensure the server-side traffic uses the client IP, making asymmetric routing inevitable in this scenario.
B: This is technically contradictory; "Auto Map" specifically uses existing self-IPs and does not require or use a "SNAT pool" configuration.
C: While using a specific translation address can work, it does not inherently guarantee the Layer 2/Layer 3 reachability mentioned in the scenario as effectively as ensuring the self-IP is correctly placed in the server's subnet.
NEW QUESTION # 33
Which of the following has iApp configured objects?
Answer: C
Explanation:
An F5 iApp is a template-driven system used to deploy complex applications by grouping all necessary BIG- IP objects (Virtual Servers, Pools, Profiles) into a single management entity. Objects created by an iApp are distinguished by their naming convention and metadata. In the provided exhibit, the Virtual Server configuration in Option A is clearly identified as an iApp-managed object through two primary indicators.
First, the object resides within a sub-directory or partition ending in .app (/Common/vmware_test.app/).
Second, the configuration explicitly includes the attribute app-service /Common/vmware_test.app
/vmware_test, which serves as the system's internal pointer linking the LTM object back to the parent iApp Application Service. Furthermore, several profiles associated with this virtual server also reside within the same .app container, such as /Common/vmware_test.app/vmware_test_http.
In contrast, Options B, C, and D represent standard, manually created Virtual Servers. While they may have complex configurations (such as the APM profiles in app2_vs and app1_vs), they lack the folder-based naming hierarchy and the app-service metadata attribute that denotes iApp ownership. Standard objects like app1_vs are managed individually, whereas the objects within vmware_test.app are typically protected by
"Strict Updates." This means their configuration is controlled by the iApp's template logic; any manual attempt to modify these specific parameters directly via the Virtual Server menu would result in an error message stating the service must be updated via the application management interface. Identifying these objects is a critical procedural step for administrators to determine whether a configuration should be edited through the standard LTM menus or through the iApp's "Reconfigure" tab to ensure consistency and prevent manual changes from being overwritten by the template.
NEW QUESTION # 34
Due to a change in application requirements, a BIG-IP Administrator needs to modify the configuration of a Virtual Server to include a Fallback Persistence Profile.
Which persistence profile type should the BIG-IP Administrator use?
Answer: A
Explanation:
Fallback persistence is used when the primary persistence method fails. Source Address Affinity is a Layer 4 persistence method and is fully supported as a fallback option for most virtual server types.
NEW QUESTION # 35
A BIG-IP Administrator needs to configure health monitors for a pool containing HTTP, HTTPS, FTP, and SSH services.
Which configuration ensures accurate member status?
Answer: D
Explanation:
Using "at least one" ensures each member is marked up based on its relevant service monitor.
NEW QUESTION # 36
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