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NEW QUESTION # 73
Refer to the exhibit. The BIG-IP Administrator has modified an iRule on one device of an HA pair.
The BIG-IP Administrator notices there is NO traffic on the BIG-IP device in which they are logged into. What should the BIG-IP Administrator do to verify if the iRule works correctly?
Answer: D
Explanation:
Based on the provided exhibits, the BIG-IP device is currently in a Standby state ("ONLINE (STANDBY)") and has a sync status of "Changes Pending" (Yellow icon).
Understanding Device State and Traffic: In an Active/Standby High Availability (HA) pair, traffic is processed by the Active device. The exhibit confirms the administrator is logged into the Standby device, which explains why there is "NO traffic" currently observed on this specific unit.
Configuration Synchronization (ConfigSync): When an administrator modifies a local object, such as an iRule, on one member of a device group, the changes must be synchronized to the other members to ensure consistency. The "Changes Pending" status indicates that the local configuration on this device is newer than the configuration on other group members.
Push vs. Pull: * Push: Sends the configuration from the current device to the other members of the device group.
Pull: Overwrites the current device's configuration with the configuration from another member of the group.
Resolving the Scenario: Since the administrator modified the iRule on "this device," they must Push the configuration to the group so the Active device receives the updated iRule. To verify the iRule works, the administrator can then monitor the traffic on the Active device or initiate a manual failover to make "this device" Active, allowing it to process traffic with the new iRule.
Option D is the correct administrative workflow: synchronize the changes to the group (Push) and then monitor the traffic flow to validate the new logic.
NEW QUESTION # 74
Refer to the exhibit.
An LTM device has a virtual server mapped to www.f5.com . Users report that when they connect to www.f5.com they are unable to receive content. What is the likely cause of the issue? (Choose one answer)
Answer: A
Explanation:
Based on the configuration screens provided in the exhibit, the primary reason for the connectivity failure is the disabled ARP setting on the Virtual Address.
Virtual Address ARP Setting: In a standard BIG-IP deployment, the Address Resolution Protocol (ARP) must be enabled for the Virtual Address (192.168.238.111 in this case). When enabled, the BIG-IP system responds to ARP requests from the local network gateway or adjacent devices for that specific IP address.
Exhibit Analysis: Looking at the "Virtual Address List >> 192.168.238.111" properties section, the ARP checkbox is unselected (unchecked). Because ARP is disabled, the upstream router or client cannot resolve the MAC address for 192.168.238.111, and the traffic never reaches the BIG-IP LTM.
Availability Indicators: Note the yellow circle (status indicator) on both the Virtual Server and the Pool Members. In F5 BIG-IP, a yellow status typically indicates that the object is "Available" (Enabled) but its monitors are not currently identifying it as "Up" (which would be a green circle), or it is in a "Monitor Unknown" state. However, even if a pool is available, the traffic must first reach the Virtual Server, which is prevented here by the lack of ARP.
Incorrect Options Analysis:
Priority Group Activation (A): The exhibit shows this is "Disabled". While this affects how load balancing picks members between groups, it does not prevent all content from being received; the system would simply use all members in the pool.
Route Advertising (C): While "Route Advertisement" is also unchecked, this is generally only required if the BIG-IP needs to dynamically propagate the Virtual Address route via protocols like BGP or OSPF. For local segment connectivity, ARP is the fundamental requirement.
NEW QUESTION # 75
Which two methods should the BIG-IP Administrator use to troubleshoot a pool member that has been marked DOWN by its health monitor? (Choose two answers)
Answer: B,D
Explanation:
When a pool member is marked DOWN, it indicates that the configured health monitor is failing.
The most effective troubleshooting approach is to focus on the monitor behavior and the actual traffic between BIG-IP and the pool member.
Enabling monitor logging (Option B) is a recommended first step. Monitor logging provides detailed information about why the health check is failing, such as timeouts, connection refusals, incorrect responses, or unexpected status codes. This directly correlates with BIG-IP troubleshooting best practices and allows administrators to confirm whether the failure is due to application behavior, incorrect monitor configuration, or network reachability.
Collecting a TCPdump packet capture (Option D) is also a highly effective method. A packet capture allows the administrator to verify whether the monitor probes are being sent, whether responses are received, and whether packets are being dropped, reset, or malformed. This is especially valuable when diagnosing firewall issues, SSL problems, or application-level failures.
NEW QUESTION # 76
A BIG-IP Administrator needs to view the CPU utilization of a particular Virtual Server. Which section of the Configuration Utility should the administrator use for this purpose?
Answer: A
Explanation:
When a BIG-IP system experiences high overall CPU usage, troubleshooting requires identifying which specific application or service is the primary consumer of resources. While the system-wide performance graphs provide a global view, the granular data necessary to isolate a "top talker" is found in the "Local Traffic" statistics. Navigating to Statistics > Module Statistics > Local Traffic > Virtual Servers allows the administrator to see specific metrics for each configured virtual server, including the number of packets processed, current connections, and critical CPU cycles consumed. This is essential for troubleshooting performance issues where an inefficient iRule, high SSL handshake volume, or complex L7 profiles (like Compression or ASM) might be overtaxing the Traffic Management Microkernel (TMM) for one specific application. By reviewing these basic stats, an administrator can determine if a performance bottle-neck is a system-wide hardware issue or if it is isolated to a single virtual server, enabling targeted remediation such as optimizing iRule logic or moving the high-load virtual server to a dedicated device.
NEW QUESTION # 77
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?17
Answer: D
Explanation:
Comprehensive and Detailed Explanation From BIG-IP Administration Support and Troubleshooting documents: When load balancing is not working as 23expected and connections appear skewed across physical hardware, the administrator must distinguish between "member"24 and "node" level balancing. A
"member" refers to a specific IP and Port combination (e.g., 10.1.1.1:80), whereas a "node" refers to the underlying IP address (10.1.1.1) regardless of the port25. If a single server hosts multiple services (Web, FTP, API) across different pools, using "Least Connections (member)" would only balance connections within each individual pool26. This could lead to a scenario where one server is overwhelmed because it is winning the
"least connections" count in three different pools simultaneously. By selecting "Least Connections (node)," the BIG-IP tracks the total number of concurrent connections to the physical IP address across all pools it belongs to27. This ensures that the administrator can maintain an equal distribution of work across the hardware, preventing performance degradation on backend servers that host multiple application services.
NEW QUESTION # 78
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