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| Certification Vendor: | F5 Networks |
|---|---|
| Exam Name: | F5 BIG-IP Administration, Support and Troubleshooting |
| Exam Number: | F5CAB5 |
| Exam Duration: | 90 minutes |
| Real Exam Qty: | 65 - 75 |
| Passing Score: | Approx. 70% |
| Certificate Validity Period: | 2 years |
| Exam Price: | $150 USD |
| Related Certifications: | F5 Certified BIG-IP Professional F5 Certified Solution Expert |
| Exam Format: | Simulation-based items, Drag and drop, Multiple choice |
| Available Languages: | English |
| Recommended Training: | F5 Troubleshooting BIG-IP (TRB) Course F5 Administering BIG-IP (ADM) Course |
| Exam Registration: | Pearson VUE Registration |
| Sample Questions: | F5 F5CAB5 Sample Questions |
| Exam Way: | Online proctored or onsite at Pearson VUE test centers |
| Pre Condition: | Recommended: Basic networking knowledge, experience with F5 BIG-IP administration, completion of F5 Administering BIG-IP (ADM) training |
| Official Syllabus URL: | https://www.f5.com/services/training-certification/certification/exams/f5cab5 |
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NEW QUESTION # 42
Which Virtual Server type prevents the use of a default pool?
Answer: B
Explanation:
In BIG-IP TMOS administration, the "Forwarding (IP)" virtual server type is unique because it is designed to act as a high-performance router rather than a typical load balancer. Unlike a "Standard" virtual server, which terminates a connection and directs it to a specific pool of members, a Forwarding (IP) virtual server is intended to forward packets based on the system's routing table. Consequently, the configuration for this type of virtual server explicitly removes the option to associate a default pool. If an administrator is troubleshooting a scenario where they cannot assign a pool to a virtual server, they must verify if the type was accidentally set to Forwarding (IP). This type is most commonly used for outbound internet traffic (outbound SNAT) or to allow the BIG-IP to serve as a gateway between internal subnets. Identifying this constraint is vital for troubleshooting configuration errors where an administrator expects the system to load balance traffic but finds the pool association settings are grayed out or unavailable in the Configuration Utility.
NEW QUESTION # 43
A BIG-IP Administrator makes a configuration change to the BIG-IP device. Which file logs the message regarding the configuration change?
Answer: B
Explanation:
The BIG-IP system uses the audit log to track administrative actions and configuration changes.
* Audit Logging Functionality: When a user modifies the configuration via the Configuration Utility (GUI), the Traffic Management Shell (tmsh), or iControl, the system records the event in the audit log.
This includes the name of the user who made the change, the timestamp, and the specific command or object that was modified.
* Log Location: The audit log is stored at /var/log/audit.
* Evaluation of Other Options:
* /var/log/messages (Option A) contains general system and kernel messages but is not the primary source for configuration change details.
* /var/log/secure (Option B) primarily logs authentication and authorization attempts (logins and logouts).
* /var/log/user.log (Option D) is a generic Linux log file for user-level applications and does not track BIG-IP LTM configuration changes.
NEW QUESTION # 44
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 # 45
A device group is currently in theChanges Pendingsync status. How can the BIG-IP Administrator determine which member of the device group has the most recent configuration? (Choose one answer)
Answer: B
Explanation:
When a BIG-IP device group shows a Changes Pending status, it indicates that one or more devices in the group have configuration changes that have not yet been synchronized to the other members. To identifywhich device has the most recent (authoritative) configuration, the administrator must view the detailed synchronization status at thedevice group level.
The correct location is Device Management > Device Groups (Option D). Within this menu, the BIG-IP Configuration Utility displays each device group along with its synchronization status and provides details about which device has pending changes. From this view, the administrator can clearly see which device is marked as havingchanges pending, making it the source device that should be used to initiate a Sync to Groupoperation.
NEW QUESTION # 46
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: C
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 # 47
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