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NEW QUESTION # 63
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: A
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.
* Invalid Syntax: Option D is incorrect because it tries to append the hostname to the URI path, which the web server will likely reject with a "404 Not Found". tracepath (Options B and C) is a path discovery tool similar to traceroute and cannot validate HTTP response content.
NEW QUESTION # 64
A BIG-IP Administrator observes the following pool member status message:
Pool /Common/testpool member /Common/10.120.0.5:8090 monitor status
down
[/Common/http: up, /Common/http2: down; last error:]
Why is this pool member being marked down? (Choose one answer)
Answer: C
Explanation:
The pool member is marked DOWN because it is monitored by multiple health monitors, specifically an HTTP monitor and an HTTP/2 monitor. The status message clearly shows that the HTTP monitor is UP, while the HTTP/2 monitor is DOWN. In BIG-IP, when multiple monitors are assigned to a pool member, the default behavior is AND logic, meaningall assigned monitors must succeed for the pool member to be considered healthy.
In this scenario, the server is responding successfully to standard HTTP (likely HTTP/1.1) requests but does not support or respond correctly to HTTP/2 requests. As a result, the HTTP/2 monitor fails, which causes the overall monitor status to be DOWN, even though HTTP traffic itself is working.
This behavior is expected and documented in BIG-IP monitoring logic. Unless the monitor rule is explicitly changed to"at least one of", a single failing monitor will mark the pool member down.
Therefore, the correct conclusion is that the pool member isonly serving HTTP traffic, not HTTP/2.
The resolution would be to either remove the HTTP/2 monitor, correct the application to support HTTP/2, or adjust the monitor rule to match the intended health-check logic.
NEW QUESTION # 65
In an F5 BIG-IP system, a pool is configured with a health monitor and the "Manual Resume" feature is Enabled. If a pool member is marked Offline (Red) due to a health monitor failure, what will be the status of the member once the health monitor successfully passes again?
Answer: A
Explanation:
The "Manual Resume" feature is a safety mechanism used when a pool is not working as expected due to flapping services or unstable backend applications. Normally, when a health monitor fails, the pool member is marked "Offline" (Red), and when the monitor passes, it automatically returns to "Available" (Green)47. However, if "Manual Resume" is enabled, the BIG-IP will not automatically put the member back into rotation after a failure48. Even if the health check begins to pass again, the member remains in an "Offline (Disabled)" state49. This requires an administrator to manually intervene and re-enable the member. This is a common point of confusion when troubleshooting; a member may show passing health checks but still not receive traffic because it is waiting for a manual administrative "resume" command. This feature is intended to prevent "unhealthy" servers from receiving traffic until an engineer has confirmed the root cause of the initial failure was resolved.
NEW QUESTION # 66
A BIG-IP Administrator configured the following virtual server to pass traffic on all addresses and ports.
After configuration is completed, the BIG-IP Administrator notices that the virtual server is unable to pass traffic.
ltm virtual forwarding_any_vs {
destination 0.0.0.0:any
ip-forward
mask 255.255.255.255
profiles {
fastL4 { }
}
serverssl-use-sni disabled
source 0.0.0.0/0
translate-address disabled
translate-port disabled
}
Which part of the configuration is the cause of the issue? (Choose one answer)
Answer: C
Explanation:
This virtual server is intended to function as aforwarding (IP-forwarding) virtual server, which is commonly used for routing or firewall-style deployments where BIG-IP forwards traffic transparently without load balancing or address translation. For a forwarding virtual server to match and passall traffic, the destination must be configured as 0.0.0.0:anywith a mask of 0.0.0.0, not 255.255.255.255.
The configured mask 255.255.255.255 represents a/32 host mask, which restricts the virtual server to matching traffic destined only for the exact IP address 0.0.0.0. Since 0.0.0.0 is not a valid routable destination for normal traffic, no packets will ever match the virtual server, causing it to pass no traffic at all.
This is a well-documented BIG-IP behavior:
* destination 0.0.0.0:any
* mask 0.0.0.0
together define acatch-all forwarding virtual server.
The destination itself (Option A) is correct for a forwarding VS, and disabling address translation (Option C) is expected and required for IP-forwarding mode. Therefore, the incorrect subnet mask is the sole reason the virtual server is not functioning as expected.
NEW QUESTION # 67
Users are unable to reach an application. The BIG-IP Administrator checks the Configuration Utility and observes that the Virtual Server has a red diamond in front of the status. What is causing this issue?
Answer: A
Explanation:
In the BIG-IP Configuration Utility, the status icon (shape and color) provides immediate feedback on why a virtual server is not working as expected. A "Red Diamond" indicates that the object is
"Offline" and unavailable to process traffic. For a virtual server, this specific status typically means it has inherited an offline state from its mandatory backend resources. If all pool members associated with the virtual server have failed their health monitors, the virtual server will transition to a red diamond status because it has no healthy destination for incoming requests. This is distinct from a "Black Circle," which would indicate the virtual server has been manually
"Disabled" by an administrator. To troubleshoot a red diamond, the administrator must examine the associated pool and its members to determine why the health monitors are failing (e.g., server crashes, network path failures, or incorrect monitor strings). Resolving the health check failures on the pool members will return the virtual server to an "Available" (Green) status.
NEW QUESTION # 68
......
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