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| Section | Objectives |
|---|---|
| Network Performance Issue Identification | - Analyzing traffic flow issues - Identifying network-level performance bottlenecks |
| BIG-IP Operations and Support Fundamentals | - Interpreting system health and statistics - System resource utilization analysis |
| Traffic Flow and Load Balancing Troubleshooting | - Virtual server and pool troubleshooting - Load balancing behavior validation |
| Diagnostics and Root Cause Analysis | - Log interpretation and troubleshooting methods - Basic BIG-IP diagnostic workflows |
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NEW QUESTION # 33
Clients report that they cannot reach the virtual server vs-production on port 80, but are able to ping the virtual server address. The configuration is shown below:
Plaintext
ltm virtual vs-production {
destination 10.99.20.50:http
ip-protocol tcp
mask 255.255.255.255
profiles {
http {}
tcp {}
}
source 192.168.0.0/16
translate-address enabled
translate-port enabled
vlans {
external
}
vlans-enabled
}
What is the cause?
Answer: B
Explanation:
The issue is caused by the Source Address restriction configured on the virtual server.
Source Filter: The configuration contains the line source 192.168.0.0/16. This acts as an implicit Access Control List (ACL). The virtual server will only accept and process TCP connections if the client's source IP address falls within the 192.168.x.x range.
Why Ping Works: ICMP (Ping) is handled by the Virtual Address object, not the Virtual Server object. Unless ICMP is specifically disabled on the Virtual Address, it will respond to pings from any subnet, even if the Virtual Server itself is restricted by a source filter or is even disabled.
Evaluation of Other Options:
Disabled (Option A): If the VS were disabled, the configuration would typically show disabled or state down, and the symptoms would be similar, but the source filter is a more specific "misconfiguration" in this context.
Port 80 (Option C): The configuration destination 10.99.20.50:http explicitly confirms it is listening on port 80.
Unallowed Subnet: If a client from a different network (e.g., 10.10.1.5) tries to connect, the BIG-IP will silently drop the connection or send a reset because it does not match the defined source criteria.
NEW QUESTION # 34
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: A,C
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.
Reviewing pool statistics (Option C) is useful for general monitoring but does not explain why a health monitor is failing. Reviewing the routing table (Option A) is typically unnecessary unless there is evidence of a broader routing issue affecting multiple destinations.
NEW QUESTION # 35
A BIG-IP Administrator suspects that one of the BIG-IP device power supplies is experiencing power outages. Which log file should the BIG-IP Administrator check to verify the suspicion?
Answer: C
Explanation:
On a BIG-IP system, hardware-related alerts, including those for power supply units (PSUs), fans, and chassis components, are primarily logged in the Local Traffic Manager (LTM) log file.
Log Location: The file path is /var/log/ltm.
PSU Alert Messages: When a power supply fails, experiences an outage, or is unplugged, the chmand (Chassis Manager) or system_check processes log specific error codes to this file. For example, you may see messages like 010d0006:0: Chassis power supply <X> has experienced an issue or VINPUT=bad.
Troubleshooting: Administrators can use the command grep -i "power supply" /var/log/ltm to quickly filter for PSU-related events.
NEW QUESTION # 36
A BIG-IP Administrator creates a new Virtual Server. The end user is unable to access the page.
During troubleshooting, the administrator learns that the connection between the BIG-IP system and server is NOT set up correctly. What should the administrator do to solve this issue?
Answer: D
Explanation:
When a virtual server is not working as expected despite the pool members being marked "UP" (Green), the issue is frequently a return-path routing failure. If the BIG-IP forwards a request with the original client's source IP address, the backend server will try to respond directly to that client.
If the server does not have its default gateway pointed back to the BIG-IP, the response packet will be routed elsewhere (or dropped), resulting in a connection timeout for the user. To resolve this, the administrator must configure "Source Address Translation" (SNAT). By setting SNAT to
"Automap" or a specific SNAT address, the BIG-IP replaces the client's IP with its own internal self-IP. The backend server then sees the BIG-IP as the source and sends the response back to it locally. This troubleshooting step ensures a functional, symmetric traffic flow. Identifying the need for SNAT is one of the most common troubleshooting tasks for new virtual server deployments where the BIG-IP is not the default gateway for the backend servers.
NEW QUESTION # 37
A BIG-IP Administrator makes a configuration change to the BIG-IP device. Which file logs the message regarding the configuration change?
Answer: A
Explanation:
Comprehensive and Detailed Explanation From BIG-IP Administration Support and Troubleshooting documents: Troubleshooting configuration-related issues requires a clear trail of what was changed and by whom. The BIG-IP system includes a dedicated audit logging feature for this purpose28. Whenever a system object-such as a virtual server, pool, or iRule-is created, modified, or deleted, the system records the event in /var/log/audit29. These logs provide critical context during troubleshooting by showing if a performance drop or traffic failure coincided with a specific administrative action30. Unlike /var/log/ltm, which focuses on local traffic events like pool member status changes, or /var/log/secure, which handles authentication attempts, the audit log specifically tracks the "how" and "when" of configuration changes31. This is a vital resource for administrators to determine if a virtual server is not working as expected due to a recent manual change or an automated system action, allowing for a rapid "rollback" or correction of the configuration.
NEW QUESTION # 38
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