サンプル問題 1： Which virtual server type is being configured in the screenshot? (Choose one answer.)
A: Standard
B: Forwarding IP
C: Performance Layer 4
正解：C
Explanation: Comprehensive and Detailed Explanation (BIG-IP Administration C Data Plane Concepts): The configuration shown matches a Performance Layer 4 virtual server because it is explicitly using a FastL4 profile: The screenshot shows Protocol: TCP and Protocol Profile (Client): fastL4. In BIG-IP data plane terms, FastL4 is the hallmark of a Performance (Layer 4) virtual server, designed to process connections at Layer 4 with minimal overhead (high throughput/low latency) compared to full proxy L7 processing. The screenshot also shows HTTP Profile (Client): None (and HTTP server profile effectively not in use). A Standard virtual server commonly uses full-proxy features and frequently includes L7 profiles (like HTTP) when doing HTTP-aware load balancing, header manipulation, cookie persistence, etc. In contrast, a Performance L4 virtual server typically does not use an HTTP profile because it is not doing HTTP-aware (Layer 7) processing. It is not a Forwarding IP virtual server: A Forwarding (IP) virtual server is used to route/forward packets (often without load balancing to pool members in the same way as Standard/Performance VS) and is selected by choosing a forwarding type. The presence of a TCP protocol with a FastL4 client profile aligns with a Layer 4 load-balancing style virtual server, not a packet-forwarding virtual server type. Conclusion: Because the configuration is TCP-based and explicitly uses fastL4 with no HTTP profile, the expected BIG-IP virtual server type is Performance Layer 4 (Option C)
サンプル問題 2： A development team needs to apply a software fix and troubleshoot one of its servers. The BIG-IP Administrator needs to immediately remove all connections from the BIG-IP system to the back-end server. The BIG-IP Administrator checks the virtual server configuration and finds that a persistence profile is assigned to it. What should the BIG-IP Administrator do to meet this requirement? (Choose one answer)
A: Set the pool member to a Forced Offline state and manually delete existing connections through the command line
B: Set the pool member to an Offline state and manually delete existing connections through the command line
C: Set the pool member to a Forced Offline state
D: Set the pool member to a Disabled state
正解：C
Explanation: Comprehensive and Detailed Explanation (BIG-IP Administration C Data Plane Concepts): In BIG-IP traffic management, persistence profiles cause existing client connections (and subsequent requests) to be repeatedly sent to the same pool member. When persistence is enabled, simply preventing new connections is not sufficient if the requirement is to immediately remove all existing connections. Key behavior of pool member states: Forced Offline Immediately removes the pool member from load balancing. Terminates all existing connections, regardless of persistence. Prevents new connections from being established. This is the correct state when urgent maintenance or troubleshooting is required. Disabled Prevents new connections from being sent to the pool member. Allows existing connections to continue, which is not acceptable when persistence is configured and connections must be cleared immediately. Offline (non-forced) Similar to Disabled behavior depending on context. Does not guarantee immediate termination of existing connections. Manually deleting connections via the command line Is unnecessary and operationally inefficient. BIG-IP already provides a supported mechanism (Forced Offline) to cleanly and immediately remove traffic. Conclusion: To immediately remove all existing connections, including those maintained by persistence, the BIG-IP Administrator must set the pool member to a Forced Offline state. This directly satisfies the requirement without additional manual steps.
サンプル問題 3： Active connections to pool members are unevenly distributed. The load balancing method is Least Connections (member). Priority Group Activation is disabled. What is a potential cause of the uneven distribution? (Choose one answer)
A: Priority Group Activation is disabled
B: SSL Profile Server is applied
C: A persistence profile is applied
D: Incorrect load balancing method
正解：C
Explanation: Comprehensive and Detailed Explanation (BIG-IP Administration C Data Plane Concepts): With Least Connections (member), BIG-IP attempts to send new connections to the pool member with the fewest current connections. In a perfectly “stateless” scenario (no affinity), this often trends toward a fairly even distribution over time. However, persistence overrides load balancing: When a persistence profile is applied, BIG-IP will continue sending a client (or client group) to the same pool member based on the persistence record (cookie / source address / SSL session ID, etc.). This means even if another pool member has fewer connections, BIG-IP may still select the persisted member to honor session affinity. The result can be uneven active connection counts, even though the configured load balancing method is Least Connections. Why the other options are not the best cause: A. Priority Group Activation is disabled Priority Group Activation only affects selection when priority groups are configured; disabling it does not inherently create uneven distribution under Least Connections. B. SSL Profile Server is applied A server-side SSL profile affects encryption to pool members, but it does not by itself cause skewed selection across pool members. (Skew could happen indirectly if members have different performance/latency, but that’s not the primary, expected exam answer.) D. Incorrect load balancing method Least Connections is a valid method and does not itself explain unevenness unless something is overriding it (like persistence) or pool members are not all eligible. Conclusion: A persistence profile is the most common and expected reason that active connections become unevenly distributed, because persistence takes precedence over the Least Connections load-balancing decision.
試験はこの世界で成功しやすいことの一つです。試験は前もって範囲を教えていますから、復習はこの範囲内の自分ができないところを探し続けています。GOWUKAKUはF5CAB2問題集を用いたF5CAB2（BIG-IP Administration Data Plane Concepts (F5CAB2) exam）試験の復習方法を案内しています。
