F5CAB5 Exam Dumps : BIG-IP Administration Support and Troubleshooting (F5CAB5) exam

To ensure a support case is processed and routed efficiently, F5 specifies a mandatory set of baseline information.

Serial Number: Required to verify the support contract and entitlement level for the hardware or virtual edition.

QKView: This is described as the "first and most important thing to have when opening a case". It provides the F5 Support Engineer with the necessary diagnostic data to understand the system's current state and resource utilization.

Problem Description: A precise description of the issue, including symptoms, when the problem started, and the business impact, is critical for routing the case to the correct technical team.

Contact Info: Accurate contact information for the individual who will be working on the ticket with F5.

Comparison: While packet captures (Option A) or UCS files (Option B) are often useful, they are not strictly required for the initial opening of all support tickets; however, a QKView is considered a primary prerequisite for technical analysis.

F5 BIG-IP provides two distinct ways to throttle traffic on a Virtual Server: total capacity and velocity.

Connection Rate Limit: This setting specifically controls the number of new connection attempts per second. It is the correct tool for managing traffic spikes and protecting backend resources from being overwhelmed by a high frequency of new requests.

Comparison (Connection Limit): A standard Connection Limit (Option C) restricts the total concurrent connections allowed at any one time, regardless of how fast they arrive.

Other Profiles: OneConnect (Option A) is used for connection pooling and reuse to reduce server-side load, and HTTP Compression (Option B) reduces bandwidth usage but does not limit connection counts or rates.

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.