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| Section | Objectives |
|---|---|
| High Availability and Troubleshooting | - Device Service Clustering (DSC)
|
| Advanced Traffic Control | - iRules and Traffic Steering
|
| F5 BIG-IP System Fundamentals | - Initial Configuration and System Components
|
| Traffic Processing and Policies | - Profiles and Protocol Handling
|
| Traffic Management and Load Balancing | - Load Balancing Methods
|
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NEW QUESTION # 34
Refer to the exhibit.
A BIG-IP Administrator creates a new Virtual Server to load balance SSH traffic. Users are unable to log on to the servers.
What should the BIG-IP Administrator do to resolve the issue? (Choose one answer)
Answer: D
Explanation:
SSH is a Layer 4 TCP-based protocol that operates on TCP port 22 and does not use HTTP in any capacity. In the exhibit, the Virtual Server is configured with an HTTP Profile applied, which is inappropriate for SSH traffic and causes connection failures.
According to the BIG-IP Administration: Data Plane Configuration documentation:
An HTTP profile must only be applied to Virtual Servers handling HTTP or HTTPS traffic.
When an HTTP profile is attached, BIG-IP expects HTTP headers and attempts to parse application-layer data.
Non-HTTP protocols such as SSH, FTP (control), SMTP, and other raw TCP services will fail if an HTTP profile is enabled.
Why the other options are incorrect:
A . Set Protocol to UDP
SSH uses TCP, not UDP. Changing the protocol would break SSH entirely.
B . Set Source Address to 10.1.1.2
The source address setting controls client access restrictions and is unrelated to protocol parsing issues.
C . Set Destination Address/Mask to 0.0.0.0/0
The destination address is already valid for a specific SSH service and does not impact protocol handling.
Correct Resolution:
The BIG-IP Administrator should remove the HTTP Profile (set it to None) so the Virtual Server functions as a pure Layer 4 TCP service, allowing SSH connections to pass through successfully.
NEW QUESTION # 35
A BIG-IP Administrator adds new pool members into a highly utilized pool. Users report application failures.
Which pool-level setting should be checked?
Answer: A
Explanation:
Slow Ramp Time prevents new pool members from receiving full traffic immediately, avoiding overload.
NEW QUESTION # 36
All pool members are online. All other virtual server settings are at default. What might alter the load balancing behavior?
Answer: C
Explanation:
In a default BIG-IP configuration, the system utilizes the Load Balancing Method (typically Round Robin) to distribute each new connection across available pool members. However, the introduction of a persistence profile fundamentally changes this behavior. Persistence (also known as "stickiness") ensures that once a client has been load balanced to a specific pool member, all subsequent requests from that same client during a defined session or timeout period are directed to that same member, bypassing the standard load balancing algorithm. This is critical for applications that maintain state, such as shopping carts or authenticated sessions, where moving a user to a different server would result in a loss of session data.
While other options affect traffic handling, they do not "alter" the fundamental load balancing decision in the same way. A OneConnect profile (Option A) optimizes connection management by pooling idle server-side connections; while it changes how connections are reused, the initial load balancing decision still follows the configured method. A fallback host (Option C) is only utilized when the primary pool is unavailable, and since the question states all pool members are online, it remains inactive. SNAT Automap (Option D) changes the source IP address of the packet as it exits the BIG-IP toward the server to ensure return traffic passes back through the ADC, but it does not dictate which server is chosen for the request. Therefore, the persistence profile is the primary configuration element that overrides the load balancing algorithm to maintain a client-to- server relationship.
NEW QUESTION # 37
A BIG-IP Administrator finds the following log entry: tmm tmm[714]: 011e0002:4: sweeper_update:
aggressive mode activated. Which action should the BIG-IP administrator take to mitigate this memory issue?
Answer: B
Explanation:
The log message "aggressive mode activated" indicates that the BIG-IP's adaptive connection management system (the "Sweeper") has detected that the system's memory or connection limits are reaching a critical threshold. To protect the system from crashing due to memory exhaustion (OOM), the BIG-IP enters Aggressive Mode, where it begins to proactively and rapidly reap (close) idle connections to free up resources for new incoming traffic.
To mitigate this and return the system to a healthy state, the administrator needs to reduce the overall resource footprint of existing connections. Decreasing the TCP profile Idle Timeout value (Option B) is the most effective administrative action. In many environments, the default idle timeout is 300 seconds (5 minutes). If a large number of connections remain "open" in the BIG-IP connection table long after the clients have stopped sending data, they consume valuable TMM (Traffic Management Microkernel) memory. By lowering the timeout (e.g., to 60 or 120 seconds), the BIG-IP can expire and remove these inactive entries much sooner, preventing the connection table from bloating and triggering the Sweeper's aggressive mode.
Conversely, increasing the timeout (Option C) would exacerbate the problem by keeping "dead" connections in memory even longer. Connection Mirroring (Option D) actually increases memory usage because every connection must be duplicated on the standby peer. An active-active configuration (Option A) might spread the load but does not address the underlying resource management issue on the individual units. Therefore, tightening the idle timers is the standard procedural fix for memory pressure caused by high connection volumes.
NEW QUESTION # 38
An organization is reporting slow performance accessing their Intranet website. All employees use a single Proxy Server with a public IP.
What should the BIG-IP Administrator do to fix this issue?
Answer: C
Explanation:
When multiple users share one source IP, source-address persistence fails. Cookie persistence uniquely identifies users at Layer 7 and ensures correct session handling.
NEW QUESTION # 39
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