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問題 #52
Due to a change in application requirements, a BIG-IP Administrator needs to modify the configuration of a Virtual Server to include a Fallback Persistence Profile. Which persistence profile type should the BIG-IP Administrator use for this purpose?
答案:C
問題 #53
Without decrypting, what portion of an HTTPS session is visible with a packet capture? (Choose one answer)
答案:C
解題說明:
In an HTTPS session, the application-layer payload--including HTTP request headers, response headers, cookies, and body content--is encrypted using SSL/TLS. Without decrypting the traffic (for example, without SSL offloading on BIG-IP or access to the private keys), a packet capture cannot reveal any HTTP-level details.
However, network-layer and transport-layer information remains visible, even when encryption is used. This includes source and destination IP addresses, source and destination ports, TCP flags, sequence numbers, and TLS handshake metadata. Therefore, thesource IP address (Option B) is visible in a packet capture of HTTPS traffic without decryption.
問題 #54
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?
答案:B
解題說明:
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 tr18affic 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.
問題 #55
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?
答案:B
解題說明:
When load balancing is not working as expected and connections appear skewed across physical hardware, the administrator must distinguish between "member" 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 port. If a single server hosts multiple services (Web, FTP, API) across different pools, using "Least Connections (member)" would only balance connections within each individual pool. 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 to. 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.
問題 #56
A BIG-IP Administrator makes a configuration change to the BIG-IP device. Which file logs the message regarding the configuration change?
答案:B
解題說明:
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.
問題 #57
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