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15. Frage
A Virtual Server uses an iRule to send traffic to pool members depending on the URI. The BIG-IP Administrator needs to modify the pool member in the iRule. Which event declaration does the BIG-IP Administrator need to change to accomplish this?
Antwort: B
Begründung:
Comprehensive and Detailed Explanation From BIG-IP Administration Support and Troubleshooting documents: In F5 TMOS administration, the traffic flow is processed through specific event huddles w3ithin iRules. To troubleshoot or m4odify traffic based on a URI (Uniform Resource Identifier), the BIG-IP system must first parse the application-layer data. The HTTP_REQUEST event is triggered when the system has fully received and parsed the HTTP request headers from the client5. This is the correct point to implement logic that selects a pool or pool member based on the path or file requested (e.g., /images or /api). Using CLIENT_ACCEPTED would be too early in the troubleshooting process because that event triggers at the L4 (TCP) connection establishment phase, before any URI information is available6. Conversely, HTTP_RESPONSE occurs during the return traffic from the server, which is too late to make a load balancing decision7. For troubleshooting virtual server behavior where URIs are involved, ensuring the iRule is attached to a Virtual Server with an HTTP profile and using the HTTP_REQUEST event is essential for proper traffic steering and inspection.
16. Frage
Refer to the exhibit.
A BIG-IP Administrator configured a virtual server with a pool of 3 members and selected the Round Robin load balancing method to evenly distribute traffic across the pool members. During initial testing, traffic was not evenly distributed and the pool member 172.16.20.3 received more traffic than the other pool members.
Refer to the exhibit and the virtual server configuration provided below:
Plaintext
ltm virtual http.vs {
destination 10.10.1.100:http
ip-protocol tcp
mask 255.255.255.255
persist {
source_addr { default yes }
}
pool http.pool
profiles {
tcp{}
}
serverssl-use-sni disabled
source 0.0.0.0/0
source-address-translation {
type automap
}
translate-address enabled
}
What is the most likely cause of this behavior?
Antwort: A
Begründung:
The primary reason for the uneven traffic distribution is the presence of a Persistence Profile in the virtual server configuration.
Load Balancing vs. Persistence: While the Round Robin method is designed to distribute new connections sequentially among pool members, Persistence overrides this logic for existing clients.
Source Address Persistence: The configuration shows source_addr persistence is enabled. This ensures that once a client (identified by their source IP) is mapped to a pool member, all subsequent connections from that same IP will be sent to the same member for the duration of the persistence record.
Uneven Distribution Logic: If one source IP address generates significantly more connections or longer-lived sessions than others--or if many clients appear behind a single NAT/Proxy IP--that specific pool member (in this case, 172.16.20.3) will receive a disproportionate amount of traffic compared to the others.
17. Frage
A BIG-IP Administrator makes a configuration change to the BIG-IP device. Which file logs the message regarding the configuration change?
Antwort: D
Begründung:
The BIG-IP system uses the audit log to track administrative actions and configuration changes.
Audit Logging Functionality: When a user modifies the configuration via the Configuration Utility (GUI), the Traffic Management Shell (tmsh), or iControl, the system records the event in the audit log. This includes the name of the user who made the change, the timestamp, and the specific command or object that was modified.
Log Location: The audit log is stored at /var/log/audit.
18. Frage
A BIG-IP Administrator notices that one of the servers that runs an application isNOTreceiving any traffic.
The BIG-IP Administrator examines the configuration status of the application and observes the displayed monitor configuration and affected pool member status.
What is the possible cause of this issue? (Choose one answer)
Antwort: C
Begründung:
The key clue in the exhibit is the pool member's availability showing"Offline (Enabled) - Parent down". In BIG-IP terminology, a pool member inherits the status of itsparent node. If thenodeis marked down (for example, by a node-level monitor or a default "node is down" condition), thenall pool members using that node IPwill also be marked down and will not receive any traffic, even if the application service on the member port might be healthy.
While the HTTPS monitor configuration (send/receive strings) is displayed, the statusspecificallyindicates anode (parent) failure, not a service-level failure. If the problem were the application not matching the receive string, you would typically see the member down due to themember's monitorfailing (and the status would reflect monitor failure details), rather than "parent down." Option D is too broad; BIG-IP can generally reach the subnet (other servers work), and this symptom points to a specific node condition. Option C is incorrect because HTTP/1.1 is commonly used for monitoring and is valid when properly formatted (especially with a Host header). Therefore, the most likely cause is that thenode health monitor is not responding, causing the node-and consequently the member-to be marked down.
19. Frage
Plaintext
warning tmm[<pid>]: 011e0002:4: sweeper_segment_cb_any: Aggressive mode
/Common/default- eviction-policy activated (0) (global memory).
(345209/690176 pages)
warning tmm[<pid>]: 011e0003:4: Aggressive mode sweeper:
/Common/default-eviction-policy (0) (global memory) 1 Connections
killed
What is happening when the BIG-IP Administrator sees the messages in the LTM log displayed above? (Pick the 2 correct responses below)
Antwort: B,C
Begründung:
These log messages indicate that the BIG-IP system is under significant resource pressure and has activated its Adaptive Connection Management.
Global Eviction Policy: The message Aggressive mode ... activated (global memory) confirms that the system has reached a memory utilization threshold that triggers the eviction policy. This happens because TMM (the data plane) is running low on available memory pages.
Sweeper/Reaping: Once in "Aggressive mode," the BIG-IP "sweeper" starts reaping (terminating) connections to free up memory. The log Connections killed confirms this is occurring.
Impact: The system does not drop all connections; it targets connections based on the eviction policy (e.g., oldest connections or those exceeding limits) to bring memory usage back to safe levels. Thus, some connections will be dropped (Option A), and the cause is TMM memory exhaustion (Option C).
20. Frage
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