F5CAB5 real questions - Testking real exam - BIG-IP Administration Support and Troubleshooting VCE

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F5 F5CAB5 Exam Syllabus Topics:

TopicDetails
Topic 1
  • Identify the reason load balancing is not working as expected: This domain addresses troubleshooting load balancing by analyzing persistence, priority groups, rate limits, health monitor configurations, and availability status.
Topic 2
  • Determine resource utilization: This domain covers analyzing system resources including control plane versus data plane usage, CPU statistics per virtual server, interface statistics, and disk and memory utilization.
Topic 3
  • Identify network level performance issues: This section focuses on diagnosing network problems including packet capture needs, interface availability, packet drops, speed and duplex settings, and TCP profile optimization.,

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F5 BIG-IP Administration Support and Troubleshooting Sample Questions (Q30-Q35):

NEW QUESTION # 30
In the BIG-IP Configuration Utility, a user requests a single screen view to determine the status of all Virtual Servers and associated pool members, as well as any iRules in use. Where should the BIG-IP Administrator instruct the user to find this view?32

Answer: D

Explanation:
Comprehensive and Detailed Explanation From BIG-IP A41dministration Support and Troubleshooting documents: To confirm functionality across a complex environment, the "Network Map" is the most efficient troubleshooting tool in the Configuration Utility43. It provides a hierarchical, visual representation of the traffic management objects44. A single glance allows the administrator to see the status of a Virtual Server (Green/Red/Yellow), the status of its associated pool, the health of individual pool members, and which iRules are currently attached45. This view is superior to the standard "Virtual Server List" for troubleshooting because it maps the dependencies between objects46. For example, if a Virtual Server is "Red," the Network Map will show if that status is inherited from a failed pool or a specific monitor failing on a pool member. Reviewing these basic stats in the Network Map helps the administrator quickly isolate whether a failure is at the service level (Virtual Server), the logic level (iRule), or the hardware level (Pool Member).


NEW QUESTION # 31
A BIG-IP Administrator disabled a virtual server with a pool that has a working health monitor.
How does the status icon look for this virtual server?

Answer: D

Explanation:
BIG-IP status icons provide immediate visual feedback regarding the state of an object based on its availability and enabled/disabled status.
Color (Black): The color black indicates that an object has been manually Disabled by an administrator.
Shape (Circle): The circular shape indicates that the object is Available (i.e., its health monitors are passing).
Scenario Result: Since the virtual server is manually disabled (Black) but its associated pool has a working health monitor that is currently passing (Circle), the resulting icon is a Black Circle.


NEW QUESTION # 32
Which process is most likely responsible for high traffic processing CPU usage?

Answer: A

Explanation:
TMM handles traffic processing and is usually responsible for high CPU under load.


NEW QUESTION # 33
Refer to the exhibit.

A user with IP address 192.168.162.70 is unable to connect to an HTTP application. What is a possible cause within the Virtual Server configuration?

Answer: D

Explanation:
The failure to connect is caused by a restrictive Source Address filter configured on the Virtual Server.
Source Address Filtering: In the BIG-IP system, the Source Address field on a Virtual Server acts as an implicit Access Control List (ACL). Only traffic originating from a client IP address that matches the specified network range will be accepted and processed by the Virtual Server.
Analyzing the Exhibit: The provided configuration for vs_http shows the Source Address is set to 10.128.10.0/24. This means the Virtual Server will only accept connections from the subnet ranging from 10.128.10.1 to 10.128.10.254.
Identifying the Conflict: The user trying to connect has the IP address 192.168.162.70. Since 192.168.162.70 does not fall within the allowed 10.128.10.0/24 range, the BIG-IP system will not match this traffic to the Virtual Server, effectively blocking the connection attempt.
Evaluation of Other Options:
All Ports (Option A): Configuring a Virtual Server for "All Ports" (port 0) allows it to handle traffic for any destination port, which would not block a standard HTTP application.
Destination Address (Option B): The destination address 192.168.162.80 is the Virtual IP (VIP) users should be connecting to; this is a standard configuration and not the cause of the failure for a user reaching out to it.
Standard Type (Option C): A "Standard" Virtual Server is the most common type used for HTTP applications as it allows for Layer 7 profiles and full proxy capabilities.


NEW QUESTION # 34
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?

Answer: A

Explanation:
Comprehensive and Detailed Explanation From BIG-IP Administration Support and Troubleshooting documents: When troubleshooting intermittent connection resets on a "busy" Virtual Server, the administrator must examine the configured thresholds62. A "Connection Limit" is a hard cap on the number of concurrent connections a Virtual Server or pool member can handle63. If this limit is set too low, the BIG-IP will reset any new connection attempts once the threshold is reached64. 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 error65. 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 volume66. 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.


NEW QUESTION # 35
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