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54. 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: C
Begründung:
In F5 TMOS administration, the traffic flow is processed through specific event huddles within iRules. To troubleshoot or modify 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 client. 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 available. Conversely, HTTP_RESPONSE occurs during the return traffic from the server, which is too late to make a load balancing decision. 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.
55. 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: A,B
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).
56. 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: A,B
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).
57. Frage
During a high-demand traffic event, the BIG-IP Administrator needs to limit the number of new connections per second allowed to a Virtual Server. What should the administrator apply to accomplish this task?
Antwort: A
Begründung:
F5 BIG-IP provides two distinct ways to throttle traffic on a Virtual Server: total capacity and velocity.
Connection Rate Limit: This setting specifically controls the number of new connection attempts per second. It is the correct tool for managing traffic spikes and protecting backend resources from being overwhelmed by a high frequency of new requests.
Comparison (Connection Limit): A standard Connection Limit (Option C) restricts the total concurrent connections allowed at any one time, regardless of how fast they arrive.
58. Frage
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: C
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.
Evaluating Other Options:
Automap (Option A): SNAT Automap changes the source IP between the BIG-IP and the pool member. It does not impact the BIG-IP's ability to load balance incoming client requests.
Ratio Settings (Option B): In the provided exhibit, the pool members have a Ratio of 1, 2, and 3 respectively. While a higher ratio does direct more traffic to a member, the question asks for the "most likely cause" in the context of the provided ltm virtual configuration, which explicitly highlights the persistence override.
HTTP Profile (Option C): Round Robin is a Layer 4 load balancing algorithm and does not require a Layer 7 HTTP profile to function.
59. Frage
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