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The BIG-IP Administration Support and Troubleshooting (F5CAB5) study material of Getcertkey is available in three different and easy-to-access formats. The first one is printable and portable BIG-IP Administration Support and Troubleshooting (F5CAB5) PDF format. With the PDF version, you can access the collection of actual BIG-IP Administration Support and Troubleshooting (F5CAB5) questions with your smart devices like smartphones, tablets, and laptops.
| Section | Weight | Objectives |
|---|---|---|
| Topic 1: Security and Access | 10% | - Role-based access control (RBAC) - User authentication (Remote Auth, LDAP, RADIUS) - SSL/TLS configuration - Packet filtering |
| Topic 2: Troubleshooting and Support | 25% | - Logging and log configuration - Common troubleshooting scenarios - SNMP and monitoring - iRules debugging - tcpdump and network capture - Performance and resource monitoring |
| Topic 3: Initial Setup and Configuration | 20% | - Network configuration (VLANs, Self IPs, Routes) - Network failover setup - User management and role-based access - NTP and DNS configuration - Initial provisioning (Provisioning, License) |
| Topic 4: Local Traffic Management (LTM) | 30% | - Load balancing modes - SSL profiles and offloading - Virtual servers (Standard, Performance L4, Forwarding) - Pools and pool members - Health monitors and monitory types - iRules and persistence profiles |
| Topic 5: Architecture and Components | 15% | - BIG-IP system architecture - High availability (HA) configurations - Traffic flow and packet processing - Device service clustering (DSC) |
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NEW QUESTION # 16
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:
Comprehensive and Detailed Explanation From BIG-IP Administration Support and Troubleshooting documents: 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.
NEW QUESTION # 17
A BIG-IP Administrator plans to upgrade a BIG-IP device to the latest TMOS version. Which two tools could the administrator leverage to verify known issues for the target versions? (Choose two answers)
Answer: B,C
Explanation:
Before upgrading a BIG-IP system to a newer TMOS version, it is critical to review known issues to avoid introducing instability or regressions.F5 Bug Tracker (Option B)is a primary resource for this purpose. It allows administrators to search for documented software defects by TMOS version, module, symptom, or bug ID. Using Bug Tracker, an administrator can identify unresolvedissues, fixed bugs, and behavioral changes that may affect their specific deployment, such as traffic handling, high availability, or module-specific functionality. This directly supports proactive troubleshooting and informed upgrade planning.
F5 iHealth (Option D)is another essential tool used during upgrade preparation. iHealth analyzes uploaded UCS or QKView files and correlates the device configuration and software version with F5's known issues database. It provides actionable reports highlighting critical defects, upgrade risks, interoperability concerns, and recommended target versions. iHealth is especially valuable because it contextualizes known issues based on the actual configuration running on the device.
NEW QUESTION # 18
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?
Answer: D
Explanation:
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.
NEW QUESTION # 19
A user wants to use the iHealth Upgrade Advisor to determine any issues with upgrading TMOS. Where can the user generate the QKView to upload to iHealth?
Answer: A
Explanation:
To utilize the F5 iHealth service, a BIG-IP Administrator must generate a diagnostic snapshot of the system known as a QKView file.
* GUI Path: In the BIG-IP Configuration Utility (GUI), the QKView generation tool is located under System > Support.
* Process: On the Support page, the user selects the "New Support Snapshot" button. From there, they ensure "QKView" is selected. Once the BIG-IP finishes collecting the data (which includes logs, configuration, and hardware statistics), the user can download the resulting .qkview file directly to their local machine.
* iHealth Integration: This file is then uploaded to ihealth.f5.com. The Upgrade Advisor tool within iHealth specifically parses this QKView to check the current configuration against known bugs, hardware limitations, or syntax changes in the target TMOS version.
* Evaluation of Other Options:
* System > Configuration (Option B): This section contains general system settings like DNS, NTP, and SNMP, but does not contain diagnostic tools.
* System > Software Management (Option C): This is where new TMOS images (.iso files) are uploaded and installed, but it is not used for generating diagnostic reports.
* System > Archives (Option D): This is used to create and manage UCS (User Configuration Set) files, which are full system backups. While UCS files contain configuration, they do not contain the deep diagnostic logs and hardware stats required by iHealth for an Upgrade Advisor analysis.
NEW QUESTION # 20
A BIG-IP Administrator receives reports from users that SSL connections to the BIG-IP device are failing. Upon checking the log files, the administrator notices: SSL transaction (TPS) rate limit reached. stats show a maximum of 1200 client-side SSL TPS and 800 server-side SSL TPS.
What is the minimum SSL license limit required to handle this peak?
Answer: A
Explanation:
Troubleshooting failed SSL handshakes involves interpreting the resource limits defined by the system's license. The log message SSL transaction (TPS) rate limit reached indicates the BIG-IP is dropping SSL connections because it has exceeded its licensed "Transactions Per Second" capacity. When analyzing stats to determine the correct license level, the administrator must focus on "Client- side" SSL TPS. This represents the initial encrypted handshakes between users and the BIG-IP virtual servers91. In this scenario, the peak client-side demand is 1200 TPS.
While the 800 server-side transactions represent re-encryption toward the backend, F5's primary SSL TPS license limits typically apply to the client-facing side of the traffic flow. Therefore, to resolve the intermittent connectivity issues and ensure the virtual server works reliably during peaks, the license must be upgraded to at least 1200 TPS. Confirming this peak via statistics andcomparing it to the current license is a standard troubleshooting step for SSL performance issues.
NEW QUESTION # 21
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