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F5 F5CAB5 시험요강:

주제소개
주제 1
  • Identify the reason a virtual server is not working as expected: This section covers diagnosing virtual server issues including availability status, profile conflicts and misconfigurations, and incorrect IP addresses or ports.
주제 2
  • Determine resource utilization: This domain covers analyzing system resources including control plane versus data plane usage, CPU statistics per virtual server, interface statistics, and disk and memory utilization.
주제 3
  • Identify the reason load balancing is not working as expected: This domain addresses troubleshooting load balancing by analyzing persistence, priority groups, rate limits, health monitor configurations, and availability status.
주제 4
  • Given a scenario, interpret traffic flow: This domain covers understanding traffic patterns through client-server communication analysis and interpreting traffic graphs and SNMP results.
주제 5
  • Given a scenario, review basic stats to confirm functionality: This section involves interpreting traffic object statistics and network configuration statistics to validate system functionality.
주제 6
  • Identify the reason a pool is not working as expected: This domain focuses on troubleshooting pools including health monitor failures, priority group membership, and configured versus availability status of pools and members.

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F5 F5CAB5시험패스 가능한 인증공부 - F5CAB5시험대비 최신버전 공부자료

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최신 F5-CA F5CAB5 무료샘플문제 (Q16-Q21):

질문 # 16
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)

정답：B,D

설명：
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.


질문 # 17
In the BIG-IP Configuration Utility, a user requests a single screen view to determine the status of all Virtual Servers and associated pool members, as well as any iRules in use. Where should the BIG-IP Administrator instruct the user to find this view?

정답：D

설명：
To confirm functionality across a complex environment, the "Network Map" is the most efficient troubleshooting tool in the Configuration Utility. It provides a hierarchical, visual representation of the traffic management objects. A single glance allows the administrator to see the status of a Virtual Server (Green/Red/Yellow), the status of its associated pool, the health of individual pool members, and which iRules are currently attached. This view is superior to the standard "Virtual Server List" for troubleshooting because it maps the dependencies between objects. For example, if a Virtual Server is "Red," the Network Map will show if that status is inherited from a failed pool or a specific monitor failing on a pool member. Reviewing these basic stats in the Network Map helps the administrator quickly isolate whether a failure is at the service level (Virtual Server), the logic level (iRule), or the hardware level (Pool Member).


질문 # 18
Which command shows routing table?

정답：C

설명：
Displays routes used for packet forwarding decisions.


질문 # 19
Plaintext
warning tmm[<pid>]: 011e0002:4: sweeper_segment_cb_any: Aggressive mode /Common/default-eviction-policy activated (0) (global memory). (345209/690176 pages) warning tmm[<pid>]: 011e0003:4: Aggressive mode sweeper: /Common/default-eviction-policy (0) (global memory) 1 Connections killed What is happening when the BIG-IP Administrator sees the messages in the LTM log displayed above? (Pick the 2 correct responses below)

정답：A,C


질문 # 20
Users report that traffic is negatively affected every time a BIG-IP device fails over. The traffic becomes stabilized after a few minutes. What should the BIG-IP Administrator do to reduce the impact of future failovers?

정답：C

설명：
When traffic "stabilizes after a few minutes" following a failover, it points to a network-level performance issue involving ARP cache on upstream routers and switches. Each BIG-IP interface has a unique hardware MAC address. During failover, the Standby device takes over the floating IP address, but the upstream switch still associates that IP with the MAC of the now-offline device. Traffic is lost until the switch learns the new MAC or its ARP entry expires. "MAC Masquerading" solves this by creating a shared, virtual MAC address for the floating traffic group. This virtual MAC is used by whichever device is currently active. Because the MAC address for the virtual server IP never changes from the perspective of the network, the upstream devices do not need to update their ARP tables. This troubleshooting solution eliminates the delay associated with failover, providing a seamless transition and ensuring that application traffic flow is not disrupted when the BIG-IP HA state changes.


질문 # 21
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