Quiz 2026 Updated F5CAB5: Reliable BIG-IP Administration Support and Troubleshooting Exam Book

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F5 F5CAB5 Exam Syllabus Topics:

SectionWeightObjectives
Topic 1: Traffic Management Fundamentals25%- Profiles and persistence
  • 1. Persistence types and configuration
  • 2. Protocol profiles (HTTP, TCP, SSL)
- Virtual servers, pools, and nodes
  • 1. Load balancing methods
  • 2. Creation and configuration
Topic 2: BIG-IP System Architecture & Initial Setup20%- Platform and hardware components
  • 1. Traffic management modules
  • 2. Chassis, blades, and interfaces
- Initial configuration and licensing
  • 1. Licensing activation and registration
  • 2. Network setup and management interfaces
Topic 3: Networking & Routing15%- VLANs, self-IPs, and routes
  • 1. Static and dynamic routing
  • 2. Interface and VLAN configuration
- High availability setup
  • 1. Sync-failover and mirroring
  • 2. Device service clustering (DSC)
Topic 4: Monitoring & Health Checks10%- Monitor types and configuration
  • 1. ICMP, TCP, HTTP, and custom monitors
  • 2. Monitor status and interpretation
Topic 5: Troubleshooting & Support20%- Tools and log analysis
  • 1. Log files: /var/log and system logs
  • 2. tmsh, bigpipe, and command-line utilities
- Common issues and resolution
  • 1. Performance and resource problems
  • 2. Connectivity and traffic failures
Topic 6: Maintenance & Upgrades10%- Software installation and upgrades
  • 1. Configuration backup and restore
  • 2. Image management and installation process

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F5 BIG-IP Administration Support and Troubleshooting Sample Questions (Q71-Q76):

NEW QUESTION # 71
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?

Answer: B

Explanation:
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 crashes. 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 system. In the provided exhibit,
/dev/md4 is explicitly listed at 100% usage for the / mount point. Checking other partitions like
/usr (which is at 82% in the exhibit) would not resolve the immediate "Full" status of the root directory. 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.


NEW QUESTION # 72
A BIG-IP Administrator observes the following pool member status message:
Pool /Common/testpool member /Common/10.120.0.5:8090 monitor status down
[/Common/http: up, /Common/http2: down; last error:]
Why is this pool member being marked down? (Choose one answer)

Answer: C

Explanation:
The pool member is marked DOWN because it is monitored by multiple health monitors, specifically an HTTP monitor and an HTTP/2 monitor. The status message clearly shows that the HTTP monitor is UP, while the HTTP/2 monitor is DOWN. In BIG-IP, when multiple monitors are assigned to a pool member, the default behavior is AND logic, meaning all assigned monitors must succeed for the pool member to be considered healthy.
In this scenario, the server is responding successfully to standard HTTP (likely HTTP/1.1) requests but does not support or respond correctly to HTTP/2 requests. As a result, the HTTP/2 monitor fails, which causes the overall monitor status to be DOWN, even though HTTP traffic itself is working.
This behavior is expected and documented in BIG-IP monitoring logic. Unless the monitor rule is explicitly changed to "at least one of", a single failing monitor will mark the pool member down. Therefore, the correct conclusion is that the pool member is only serving HTTP traffic, not HTTP/2.
The resolution would be to either remove the HTTP/2 monitor, correct the application to support HTTP/2, or adjust the monitor rule to match the intended health-check logic.


NEW QUESTION # 73
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?

Answer: D

Explanation:
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.


NEW QUESTION # 74
A BIG-IP Administrator needs to view the CPU utilization of a particular Virtual Server. Which section of the Configuration Utility should the administrator use for this purpose?

Answer: D

Explanation:
When a BIG-IP system experiences high overall CPU usage, troubleshooting requires identifying which specific application or service is the primary consumer of resources. While the system-wide performance graphs provide a global view, the granular data necessary to isolate a "top talker" is found in the "Local Traffic" statistics. Navigating to Statistics > Module Statistics > Local Traffic > Virtual Servers allows the administrator to see specific metrics for each configured virtual server, including the number of packets processed, current connections, and critical CPU cycles consumed. This is essential for troubleshooting performance issues where an inefficient iRule, high SSL handshake volume, or complex L7 profiles (like Compression or ASM) might be overtaxing the Traffic Management Microkernel (TMM) for one specific application. By reviewing these basic stats, an administrator can determine if a performance bottle-neck is a system-wide h1ardware issue or if it is isolated to a single virtual server, enabling targeted remediation such as optimizing iRule logic or moving the high-load virtual server to a dedicated device.


NEW QUESTION # 75
Which menu should you use on the BIG-IP Configuration Utility to generate a QKView support file? (Choose one answer)

Answer: C

Explanation:
Comprehensive and Detailed 150 to 250 Words Explanation From BIG-IP Administration, Support, and Troubleshooting Documents:
A QKView file is the primary diagnostic support bundle used by F5 Support to troubleshoot BIG-IP system issues. It contains comprehensive system information, including running configuration, licensing details, module provisioning, hardware status, software versions, log files, statistics, and the output of numerous diagnostic commands. Generating a QKView is a standard and recommended first step when investigating performance problems, configuration issues, or when opening a support case with F5.
In the BIG-IP Configuration Utility (GUI), the correct and supported location to generate a QKView is System > Support. This menu is specifically designed for support and troubleshooting operations. From this section, administrators can generate a QKView file, monitor its creation progress, download it locally, or upload it directly to F5 iHealth for automated analysis. This workflow is clearly documented in BIG-IP Administration and Support guides and aligns with F5 best practices.
The other menu options are not appropriate:
System > Configuration is used for system-wide settings such as DNS, NTP, and device identity.
System > Archive is used to create UCS backup files, which are configuration backups, not diagnostic bundles.
System > Logs is used only for viewing system logs, not generating support files.
Therefore, System > Support is the correct and only valid answer.


NEW QUESTION # 76
......

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