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| Certification Vendor: | F5 |
|---|---|
| Exam Name: | BIG-IP Administration Support and Troubleshooting (F5CAB5) |
| Exam Number: | F5CAB5 |
| Real Exam Qty: | 25-30 |
| Exam Price: | USD 50 (online) / USD 65 (test center) |
| Passing Score: | 245 |
| Available Languages: | English |
| Related Certifications: | BIG-IP Administration Control Plane Administration BIG-IP Administration Data Plane Concepts BIG-IP Administration Install, Initial Configuration, and Upgrade BIG-IP Administration Data Plane Configuration |
| Exam Duration: | 30 minutes |
| Exam Format: | Multiple Choice |
| Recommended Training: | Troubleshooting BIG-IP Training Administering BIG-IP Course |
| 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 |
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質問 # 65
A gateway_icmp health monitor is configured on a pool. The BIG-IP Administrator is investigating why the pool is reported as down while the server is online. Other pools with servers in the same subnet are correctly monitored.
What can cause this behavior? (Choose one answer)
正解：D
解説：
A gateway_icmp monitor checks basic network reachability by sending ICMP echo requests (pings) to the pool member or its gateway. If the pool is marked DOWN while the server is confirmed to be online, the most likely cause is that ICMP traffic is being blocked.
A host-based firewall active on the server (Option C) can block ICMP echo requests or replies, preventing BIG-IP from receiving a successful response to the health check. This results in the monitor failing and the pool member being marked down, even though the server and application are otherwise functioning normally. This explanation is consistent with the scenario where other servers in the same subnet work correctly, indicating that routing and BIG-IP configuration are not the issue.
The other options are unrelated to ICMP monitoring. Logged-in users (Option A), missing patches (Option B), and stopped HTTP services (Option D) do not affect a gateway_icmp monitor. BIG-IP troubleshooting best practices recommend verifying ICMP reachability and firewall policies when diagnosing ICMP-based monitor failures.
質問 # 66
Which command checks disk usage?
正解：D
解説：
Shows disk usage in human-readable format.
質問 # 67
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?
正解：D
解説：
Comprehensive and Detailed Explanation From BIG-IP Administration S73upport and Troubleshooting documents: Persistence is critical for ensuring that a client's session remains with the same pool member throughout its duration. If primary persistence (like Cookie Persistence) fails-for instance, because the client has disabled cookies-load balancing will not work as expected, and the session may be broken. A "Fallback Persistence Profile" provides a backup method75. The most common and reliable fallback method is "Source Address Affinity"76. This method tracks the client's IP address in the BIG-IP's persistence table and ensures that any subsequent requests from that IP are routed to the same pool member, even if the primary persistence token is missing. Troubleshooting session drops often involves checking if a fallback method is configured to handle scenarios where the primary method is unsupported by the client's browser or environment. Without a fallback, the BIG-IP would revert to standard load balancing, potentially sending the client to a different server that lacks their session data.
質問 # 68
Refer to Exhibit:
An organization is reporting slow performance accessing their Intranet website, hosted in a public cloud. All employees use a single Proxy Server with the public IP of 104.219.110.168 to connect to the Internet. What should the BIG-IP Administrator of the Intranet website do to fix this issue?
正解：C
解説：
This scenario describes a classic network performance issue known as the "Mega-Proxy" problem. When an organization routes all employee traffic through a single proxy server, the BIG-IP sees thousands of unique users as having the exact same source IP address. If the administrator has configured "Source Address Affinity" persistence, the BIG-IP will correctly follow the rule but incorrectly route all users to the same single backend pool member. This creates a severe load imbalance where one server is overwhelmed while others remain idle, leading to poor application response times. To resolve this, the administrator must change the persistence profile to "HTTP Cookie". Cookie-based persistence allows the BIG-IP to place a unique identifier in each user's browser, allowing the system to distinguish between individual sessions even if they share the same source IP. This fix ensures that traffic is distributed evenly across the pool members, restoring4 the expect5ed load balancing functionality and resolving the slow performance reported by users behind the corporate proxy.
質問 # 69
Refer to the exhibit. A BIG-IP Administrator creates a new Virtual Server to load balance SSH traffic. Users are unable to log on to the servers. What should the BIG-IP Administrator do to resolve the issue? (Exhibit shows a Standard Virtual Server with an HTTP profile applied).
正解：D
解説：
When troubleshooting a Virtual Server that is not working as expected, it is critical to ensure that the applied profiles match the type of traffic being processed. SSH (Secure Shell) is a non-HTTP protocol that operates over TCP. The exhibit indicates that an HTTP profile is applied to the Virtual Server. An HTTP profile instructs the BIG-IP system to parse traffic as HTTP; however, since SSH traffic does not follow HTTP specifications, the BIG-IP's parser will fail to understand the data stream, typically resulting in dropped packets or reset connections. To fix this, the administrator must set the HTTP profile to "None". This allows the Virtual Server to act as a
"Standard" or "FastL4" listener that passes the encrypted SSH data transparently to the backend pool members without attempting application-layer inspection. This highlights a common troubleshooting step: verifying that L7 profiles are not inadvertently applied to L4 traffic, which disrupts the expected traffic flow between the client and the server.
質問 # 70
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