從Google Drive中免費下載最新的Fast2test F5CAB5 PDF版考試題庫：https://drive.google.com/open?id=1gMvKTHsdRFTFbn-LdORldxi-XfnSh9TZ
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Fast2test是一個為F5人士參加相關認證考試提供資源的便利網站。Fast2test針對不同的考生有不同的培訓方法和不同的培訓課程。有了Fast2test提供的這些針對性的培訓，考生通過F5CAB5相關考試就容易得多。很多曾經參加F5CAB5專業相關認證考試的人都是通過我們的Fast2test提供的測試練習題和答案考過的，因此Fast2test在F5行業中得到了很高的聲譽。
問題 #74
Some users who connect to a busy Virtual Server have connections reset by the BIG-IP system.
Pool member resources are NOT a factor in this behavior. What is a possible cause for this behavior?
答案：A
解題說明：
When troubleshooting intermittent connection resets on a "busy" Virtual Server, the administrator must examine the configured thresholds. A "Connection Limit" is a hard cap on the number of concurrent connections a Virtual Server or pool member can handle. If this limit is set too low, the BIG-IP will reset any new connection attempts once the threshold is reached. The key indicator in this scenario is that the problem only affects "some users" and happens when the server is
"busy," suggesting that the system is hitting a capacity ceiling rather than suffering from a persistent configuration error. Unlike a missing SSL profile, which would likely cause all connections to fail, or a "Connection Rate Limit," which throttles how fast connections arrive, a
"Connection Limit" focuses on the total volume. Identifying this as the cause requires reviewing the Virtual Server's statistics to see if the "Current Connections" count is consistently peaking at the configured limit value.
問題 #75
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?
答案：B
解題說明：
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.
問題 #76
Refer to the exhibit.
The BIG-IP Administrator has modified an iRule on one device of an HA pair. The BIG-IP Administrator notices there is NO traffic on the BIG-IP device in which they are logged into. What should the BIG-IP Administrator do to verify if the iRule works correctly?
答案：B
解題說明：
Based on the provided exhibits, the BIG-IP device is currently in a Standby state ("ONLINE (STANDBY)") and has a sync status of "Changes Pending" (Yellow icon).
Understanding Device State and Traffic: In an Active/Standby High Availability (HA) pair, traffic is processed by the Active device. The exhibit confirms the administrator is logged into the Standby device, which explains why there is "NO traffic" currently observed on this specific unit.
Configuration Synchronization (ConfigSync): When an administrator modifies a local object, such as an iRule, on one member of a device group, the changes must be synchronized to the other members to ensure consistency. The "Changes Pending" status indicates that the local configuration on this device is newer than the configuration on other group members.
Push vs. Pull: * Push: Sends the configuration from the current device to the other members of the device group.
Pull: Overwrites the current device's configuration with the configuration from another member of the group.
Resolving the Scenario: Since the administrator modified the iRule on "this device," they must Push the configuration to the group so the Active device receives the updated iRule. To verify the iRule works, the administrator can then monitor the traffic on the Active device or initiate a manual failover to make "this device" Active, allowing it to process traffic with the new iRule.
Option D is the correct administrative workflow: synchronize the changes to the group (Push) and then monitor the traffic flow to validate the new logic.
問題 #77
Clients report that they cannot reach the virtual server vs-production on port 80, but are able to ping the virtual server address. The configuration is shown below:
Plaintext
ltm virtual vs-production {
destination 10.99.20.50:http
ip-protocol tcp
mask 255.255.255.255
profiles {
http {}
tcp {}
}
source 192.168.0.0/16
translate-address enabled
translate-port enabled
vlans {
external
}
vlans-enabled
}
What is the cause?
答案：B
解題說明：
The issue is caused by the Source Address restriction configured on the virtual server.
Source Filter: The configuration contains the line source 192.168.0.0/16. This acts as an implicit Access Control List (ACL). The virtual server will only accept and process TCP connections if the client's source IP address falls within the 192.168.x.x range.
Why Ping Works: ICMP (Ping) is handled by the Virtual Address object, not the Virtual Server object. Unless ICMP is specifically disabled on the Virtual Address, it will respond to pings from any subnet, even if the Virtual Server itself is restricted by a source filter or is even disabled.
Evaluation of Other Options:
Disabled (Option A): If the VS were disabled, the configuration would typically show disabled or state down, and the symptoms would be similar, but the source filter is a more specific "misconfiguration" in this context.
Port 80 (Option C): The configuration destination 10.99.20.50:http explicitly confirms it is listening on port 80.
Unallowed Subnet: If a client from a different network (e.g., 10.10.1.5) tries to connect, the BIG-IP will silently drop the connection or send a reset because it does not match the defined source criteria.
問題 #78
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)
答案：B,E
解題說明：
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 unresolved issues, 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.
The other options are not appropriate for verifying known software issues. F5 End User Diagnostics (Option A) is a client-side troubleshooting tool, F5 University (Option C) is a training platform, and F5 Downloads (Option E) is primarily used to obtain software images and release notes, not to analyze known defects in depth.
問題 #79
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F5CAB5考古題分享: https://tw.fast2test.com/F5CAB5-premium-file.html
從Google Drive中免費下載最新的Fast2test F5CAB5 PDF版考試題庫：https://drive.google.com/open?id=1gMvKTHsdRFTFbn-LdORldxi-XfnSh9TZ