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NEW QUESTION # 23
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: D
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 # 24
Refer to the exhibit.
The BIG-IP Administrator has configured an HTTP health monitor and applied it to a pool of HTTP web servers that host the website www.f5.com , but all pool members show a "DOWN" status. From the monitor logging on the LTM, the BIG-IP Administrator notices that the web server is returning a response of "400 Bad Request." What would be the correct monitor Send string?
Answer: A
Explanation:
Comprehensive and Detailed Explanation From BIG-IP Administration Data Plane Configuration
/Course Guide/topics:
The monitor is explicitly sending an HTTP/1.1 request. For HTTP/1.1, the request must contain a valid Host header identifying the intended virtual host. The configured monitor sends the URI and Connection: Close header but omits Host: www.f5.com. A web server using name-based virtual hosting can therefore reject the request with HTTP 400 Bad Request , which explains why every pool member is marked down.
F5 ' s official BIG-IP monitor documentation gives the HTTP/1.1 convention in the form " GET / HTTP/1.
1\r\nHost: server.com\r\nConnection: close\r\n\r\n " .
Option A follows that required structure: the request line identifies HTTP/1.1, Host: www.f5.com selects the correct hosted site, Connection: Close requests connection termination after the response, and the final \r\n\r\n properly terminates the HTTP header section. F5 also specifies that when HTTP/1.0 or HTTP/1.1 is used, the monitor evaluates the HTTP status code; a non-200 response such as 400 causes the monitored resource to be considered unavailable.
Reference Topics: BIG-IP LTM Monitors Reference # HTTP Monitor Send String , HTTP/1.1 request formatting , pool-member health monitoring .
NEW QUESTION # 25
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?
Answer: A
Explanation:
The configuration error is the HTTP Profile = http setting. The virtual server is intended to load balance SSH
, which operates over TCP port 22 and is not an HTTP application protocol. The configured TCP protocol and TCP profile are therefore appropriate, but an HTTP profile should not be attached to this SSH virtual server.
F5 documentation states that an HTTP profile defines how BIG-IP manages HTTP traffic . The standard http profile operates in Reverse proxy mode by default and invokes BIG-IP ' s HTTP protocol processing. F5 separately documents Transparent HTTP proxy mode as the mode that can forward invalid HTTP traffic instead of dropping it. This distinction is important because an SSH protocol exchange is not syntactically valid HTTP traffic.
Setting HTTP Profile to None removes unnecessary Layer 7 HTTP parsing and leaves the virtual server handling the SSH connection through its TCP profile. The other changes are inappropriate: SSH requires TCP rather than UDP; the source address does not need to equal the virtual server ' s destination IP; and changing the destination to 0.0.0.0/0 is unrelated to the application-protocol mismatch.
Reference Topics: Local Traffic Profiles # HTTP Profiles , Proxy Mode , TCP profiles , Virtual Server profile assignment .
NEW QUESTION # 26
Application administrators are reporting that nodes different from those configured in the pool are selected.
The use of an iRule is suspected. How can the BIG-IP Administrator check if an iRule is used for this traffic?
(Pick the 2 correct responses below)
Answer: A,D
Explanation:
To determine if an iRule is influencing traffic for a specific Virtual Server, the administrator must verify the association between the Virtual Server object and any applied scripts. In the BIG-IP Configuration Utility (GUI), this association is found under the Resources tab of the specific Virtual Server. While there is an " iRules " sub-menu under Local Traffic, checking the Virtual Server ' s Resources tab is the definitive way to see which specific rules are currently active and in what order they are being processed for that particular traffic flow.
From the Command Line Interface (CLI), the tmsh list /ltm virtual < virtual_server > command provides a full text-based output of the virtual server ' s configuration. If iRules are applied, they will appear within a " rules { ... } " block in the command output. This is more effective than Option A, which only lists the contents of the iRule itself but does not show if or where it is applied. Option C is a common misconception; while some versions of the GUI have reorganized menus, the standard location for managing the association of profiles, policies, and iRules to a Virtual Server remains the " Resources " section. By identifying the applied iRule, an administrator can then review the script logic-often containing commands like pool or node-to see if it is overriding the default pool selection based on specific HTTP headers, URI paths, or client IP addresses.
NEW QUESTION # 27
For a given Virtual Server, the BIG-IP must perform SSL Offload and negotiate secure communication over TLSv1.2 only. What should the BIG-IP Administrator do to meet this requirement?
Answer: A
NEW QUESTION # 28
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