Get F5 Networks F5CAB3 Exam Practice Questions - Real and Updated

Answer : D

The BIG-IP system uses a centralized management framework to ensure that all devices within a Sync-Failover group share a consistent configuration. When an administrator makes a change on any member of the group---whether it is the active or the standby device---the system detects a 'ConfigSync' mismatch. The 'Device Management >> Overview' screen tracks these changes by comparing the commit ID and timestamps of the configurations across all peers.

If a change is made on the standby member, that device now possesses a more recent configuration than the other members of the group. Consequently, the BIG-IP GUI will display a status of 'Changes Pending' and suggest a Recommended Action to resolve the discrepancy. In this scenario, the correct action is to Synchronize the standby member configuration to the group. This push operation will copy the updated configuration from the standby device to the active device (and any other peers), bringing the entire cluster back into a 'In Sync' status. It is important to note that BIG-IP allows bi-directional synchronization; you do not have to be on the active device to push a configuration. However, administrators must be cautious: choosing Option C (Synchronizing the active member to the group) would overwrite the changes just made on the standby device with the older configuration from the active device, effectively reverting the changes. The Recommended Action always points toward the direction that propagates the most recent change to the rest of the group.

Answer : B

Connection rate limiting controls how many new connections per second are accepted, protecting backend resources.

Answer : A

According to the provided exhibit, the 'SSL Profile (Client)' section in the Virtual Server configuration is empty. For a BIG-IP system to process HTTPS traffic, it must act as an SSL/TLS endpoint. This process, known as SSL Termination or SSL Offload, requires the assignment of a Client SSL Profile to the Virtual Server. Without this profile, the BIG-IP does not have the necessary certificate and private key information to perform the SSL handshake with the client's browser. Consequently, when a user attempts to connect via HTTPS, the TCP connection may establish, but the SSL handshake will fail because the BIG-IP will not know how to decrypt the incoming encrypted packets.

A Client SSL profile defines the ciphers, certificates, and keys that the BIG-IP uses to communicate securely with the client. In a standard HTTPS deployment, the BIG-IP decrypts the traffic and can then send it to the backend pool members either as plain text (header insertion/manipulation) or re-encrypt it using a Server SSL profile. While a Server SSL profile (Option C) is needed if the backend servers themselves require HTTPS, the initial failure for a user reaching a Virtual Server is almost always the lack of a Client SSL profile to terminate the user's connection. Changing the Service Port to HTTP (Option D) would be incorrect because the goal is to handle HTTPS traffic (typically port 443). Assigning the 'clientssl' or a custom client-side profile from the 'Available' list to the 'Selected' list in the GUI is the mandatory step to make the Virtual Server operational for secure web traffic.

Answer : B, D

To determine if an iRule is influencing traffic for a specific Virtual Server, the administrator must verify the association between the Virtual Server object and any applied scripts. In the BIG-IP Configuration Utility (GUI), this association is found under the Resources tab of the specific Virtual Server. While there is an 'iRules' sub-menu under Local Traffic, checking the Virtual Server's Resources tab is the definitive way to see which specific rules are currently active and in what order they are being processed for that particular traffic flow.

From the Command Line Interface (CLI), the tmsh list /ltm virtual <virtual_server> command provides a full text-based output of the virtual server's configuration. If iRules are applied, they will appear within a 'rules { ... }' block in the command output. This is more effective than Option A, which only lists the contents of the iRule itself but does not show if or where it is applied. Option C is a common misconception; while some versions of the GUI have reorganized menus, the standard location for managing the association of profiles, policies, and iRules to a Virtual Server remains the 'Resources' section. By identifying the applied iRule, an administrator can then review the script logic---often containing commands like pool or node---to see if it is overriding the default pool selection based on specific HTTP headers, URI paths, or client IP addresses.

Answer : A

In this scenario, each backend node (server) hosts multiple services and is referenced by multiple pools and virtual servers. The goal is to ensure an equal number of total connections per backend server, regardless of how many pool members (services/ports) exist on that server.

According to the BIG-IP Administration: Data Plane Configuration documentation:

Least Connections (node) tracks the total number of active connections to a node across all pool members and services.

This algorithm ensures load distribution is balanced at the server level, not just at the individual service (member) level.

It is specifically recommended when:

Multiple pool members exist on the same backend server

Multiple virtual servers reference the same backend servers

Why the other options are incorrect:

B . Predictive (member)Predictive algorithms are advanced and traffic-pattern based, but they operate at the member level and do not guarantee equal connections per server.

C . Least Connections (member)This balances connections per pool member, which can overload a server hosting multiple members while still appearing ''balanced'' per member.

D . Predictive (node)Although node-aware, predictive algorithms are less deterministic and not the best choice when strict equality of connections is required.

Correct Resolution:

Using Least Connections (node) ensures that each backend server carries an equal connection load across all services and pools.