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| Certification Vendor: | F5 |
|---|---|
| Exam Name: | BIG-IP Administration Support and Troubleshooting (F5CAB5) |
| Exam Number: | F5CAB5 |
| Passing Score: | 245 |
| Available Languages: | English |
| Related Certifications: | BIG-IP Administration Data Plane Concepts BIG-IP Administration Control Plane Administration BIG-IP Administration Data Plane Configuration BIG-IP Administration Install, Initial Configuration, and Upgrade |
| Real Exam Qty: | 25-30 |
| Exam Format: | Multiple Choice |
| Exam Duration: | 30 minutes |
| Exam Price: | USD 50 (online) / USD 65 (test center) |
| Recommended Training: | Administering BIG-IP Course Troubleshooting BIG-IP Training |
| Exam Registration: | F5 Education Exam Page F5 Certification Portal |
| Sample Questions: | F5 F5CAB5 Sample Questions |
| Exam Way: | Online proctored (Certiverse) or test center proctored (Pearson VUE) |
| Pre Condition: | No formal prerequisites required; part of the F5 Certified Administrator, BIG-IP certification path (5-exam series). |
| Official Syllabus URL: | https://education.f5.com/exams/big-ip-administration-support-and-troubleshooting-f5cab5 |
F5CAB5試験に合格して証明書を取得する方法に関する質問を検討していますか？最良の答えは、F5CAB5クイズトレントをダウンロードして学習することです。 F5CAB5試験の質問は、必要なものを短時間で取得するのに役立ちます。 F5CAB5トレーニング準備を購入した後、CertShikenダウンロードしてインストールするのに少し時間が必要です。その後、学習するのに約20〜30時間かかります。 F5CAB5試験ガイドをご覧いただき、貴重な時間を割いていただければ幸いです。
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質問 # 72
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?
正解：B
解説：
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.
質問 # 73
A Virtual Server uses an iRule to send traffic to pool members depending on the URI. The BIG-IP Administrator needs to modify the pool member in the iRule. Which event declaration does the BIG-IP Administrator need to change to accomplish this?
正解：B
解説：
Comprehensive and Detailed Explanation From BIG-IP Administration Support and Troubleshooting documents: In F5 TMOS administration, the traffic flow is processed through specific event huddles w3ithin iRules. To troubleshoot or m4odify traffic based on a URI (Uniform Resource Identifier), the BIG-IP system must first parse the application-layer data. The HTTP_REQUEST event is triggered when the system has fully received and parsed the HTTP request headers from the client5. This is the correct point to implement logic that selects a pool or pool member based on the path or file requested (e.g., /images or /api). Using CLIENT_ACCEPTED would be too early in the troubleshooting process because that event triggers at the L4 (TCP) connection establishment phase, before any URI information is available6. Conversely, HTTP_RESPONSE occurs during the return traffic from the server, which is too late to make a load balancing decision7. For troubleshooting virtual server behavior where URIs are involved, ensuring the iRule is attached to a Virtual Server with an HTTP profile and using the HTTP_REQUEST event is essential for proper traffic steering and inspection.
質問 # 74
The BIG-IP Administrator is investigating disk utilization on the BIG-IP device. (Exhibit shows /dev/md4 mounted on / at 100% utilization). What should the BIG-IP Administrator check next?
正解：D
解説：
Monitoring resource utilization is essential for maintaining system stability. If the root (/) file system reaches 100% capacity, the BIG-IP may become unresponsive, fail to save configuration changes, or experience daemon crashes83. When the / partition is full, the immediate troubleshooting step is to identify large or unnecessary files-such as old log files, core dumps, or temporary installer files-located specifically within that file system84. In the provided exhibit, /dev/md4 is explicitly listed at 100% usage for the / mount point85. Checking other partitions like /usr (which is at 82% in the exhibit) would not resolve the immediate "Full" status of the root directory86. Administrators often use the du (disk usage) command via the CLI to find the problematic files. Managing disk space is a proactive task; however, when utilization hits 100%, it becomes a reactive troubleshooting emergency that must be resolved to restore the management plane's functionality.
質問 # 75
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?
正解：B
解説：
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.
質問 # 76
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?
正解：D
解説：
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.
質問 # 77
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