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| Section | Objectives |
|---|---|
| Topic 1: Network Performance Issue Identification | - Analyzing traffic flow issues - Identifying network-level performance bottlenecks |
| Topic 2: Traffic Flow and Load Balancing Troubleshooting | - Virtual server and pool troubleshooting - Load balancing behavior validation |
| Topic 3: BIG-IP Operations and Support Fundamentals | - System resource utilization analysis - Interpreting system health and statistics |
| Topic 4: Diagnostics and Root Cause Analysis | - Basic BIG-IP diagnostic workflows - Log interpretation and troubleshooting methods |
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NEW QUESTION # 43
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: C
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 # 44
A BIG-IP Administrator notices that one of the servers that runs an application is NOT receiving 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)
Answer: D
Explanation:
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 its parent node. If the node is marked down (for example, by a node-level monitor or a default "node is down" condition), then all pool members using that node IP will 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 status specifically indicates a node (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 the member's monitor failing (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 the node health monitor is not responding, causing the node-and consequently the member-to be marked down.
NEW QUESTION # 45
A custom HTTP monitor is failing to a pool member 10.10.3.75:8080 that serves up www.example.com. A ping works to the pool member address. The SEND string is:
GET / HTTP/1.1 \r\nHost: www.example.com\r\nConnection: Close\r\n\r\n.
Which CLI tool syntax will show whether the web server returns the correct HTTP response?
Answer: B
Explanation:
To manually verify a health monitor's "Send String" from the BIG-IP command line, the curl utility is the preferred tool because it allows for custom header insertion.
Matching the Monitor String: The monitor string requires an HTTP/1.1 request which must include a "Host" header. Option A correctly uses the --header (or -H) flag to pass Host:
www.example.com to the specific IP and port of the pool member.
Troubleshooting Logic: If curl--header 'Host: www.example.com' 'http://10.10.3.75:8080/' returns a
"200 OK" but the BIG-IP monitor still shows "Down," the administrator should check if the Receive String in the monitor configuration matches the output provided by curl.
NEW QUESTION # 46
A BIG-IP Administrator uses backend servers to host multiple services per server. There are multiple virtual servers and pools defined, referencing the same backend servers. Which load balancing algorithm is most appropriate to have an equal number of connections on each backend server?17
Answer: A
Explanation:
Comprehensive and Detailed Explanation From BIG-IP Administration Support and Troubleshooting documents: When load balancing is not working as 23expected and connections appear skewed across physical hardware, the administrator must distinguish between "member"24 and "node" level balancing. A
"member" refers to a specific IP and Port combination (e.g., 10.1.1.1:80), whereas a "node" refers to the underlying IP address (10.1.1.1) regardless of the port25. If a single server hosts multiple services (Web, FTP, API) across different pools, using "Least Connections (member)" would only balance connections within each individual pool26. This could lead to a scenario where one server is overwhelmed because it is winning the
"least connections" count in three different pools simultaneously. By selecting "Least Connections (node)," the BIG-IP tracks the total number of concurrent connections to the physical IP address across all pools it belongs to27. This ensures that the administrator can maintain an equal distribution of work across the hardware, preventing performance degradation on backend servers that host multiple application services.
NEW QUESTION # 47
A BIG-IP Administrator makes a configuration change to the BIG-IP device. Which file logs the message regarding the configuration change?
Answer: D
Explanation:
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.
Evaluation of Other Options:
/var/log/messages (Option A) contains general system and kernel messages but is not the primary source for configuration change details.
/var/log/secure (Option B) primarily logs authentication and authorization attempts (logins and logouts).
/var/log/user.log (Option D) is a generic Linux log file for user-level applications and does not track BIG-IP LTM configuration changes.
NEW QUESTION # 48
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