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In the BIG-IP system object hierarchy, health monitors can be applied at three levels: Node, Pool, and Pool Member.

Pool Level (Properties): Applying a monitor at the Pool > Properties level is the most common and efficient administrative practice. When applied here, the monitor is inherited by all members of that pool. If the monitor fails for a specific member, that member is marked "down" specifically for that pool.

Node Level: If a monitor is applied at the Node level (Local Traffic > Nodes), it checks the health of the physical IP address itself. If it fails, that node (and all pool members associated with it) is marked down globally across the entire system.

Member Level: Applying a monitor at the Pool > Members level allows for specific "per-member" monitoring, which is usually only done if different members in the same pool require different health checks.

The Specific Case: For a standard database pool like DB_Pool, the administrator should navigate to Local Traffic > Pools > DB_Pool > Properties and select the appropriate monitor (e.g., a custom TCP or Oracle monitor) from the "Health Monitors" configuration section.

In a large-scale BIG-IP environment with hundreds of virtual servers, the Network Map is the most effective tool for visualizing and auditing the relationships between various ADC objects.

The Network Map Functionality: The Network Map provides a hierarchical view of the local traffic objects. It allows an administrator to see the status and dependencies of Virtual Servers, Pools, Pool Members, and associated iRules all in one screen.

Search and Filter: By navigating to Local Traffic > Network Map, the administrator can use the Advanced Filter. This feature allows for searching specifically for an iRule name or a string within an iRule definition. Once the filter is applied, the system displays only the Virtual Servers that are associated with that specific iRule.

Efficiency: While the "Virtual Server List" (Option D) can be customized to show columns for iRules, it is often cumbersome to scroll through hundreds of entries. The "iRules List" (Option B) displays the scripts themselves but does not provide a reverse-lookup list of all associated virtual servers in a single view as efficiently as the Network Map.

Summary of Relationships: The Network Map is specifically designed to answer the question, "What is this object connected to?" making it the primary administrative interface for impact analysis during configuration changes.

Cookie Persistence is a Layer 7 persistence method that leverages an HTTP cookie to track a user session.

IP Independence: Unlike "Source Address Affinity" (which relies on the client's IP), Cookie persistence identifies the session base16d on a unique token provided by the BIG-IP system. This is crucial for environments where many users share a single gateway (NAT) or where a client's IP might change mid-session.

Encryption and Decryption: For the BIG-IP to insert or read a cookie, it must be able to see the HTTP header. If the traffic is encrypted end-to-end (SSL Pass-through), the BIG-IP cannot use cookie persistence. SSL must be terminated at the BIG-IP (Option B is false).

Security: By default, BIG-IP cookies are encoded, not clear text. Modern versions allow for easy encryption of these cookies to prevent information leakage (Option C is false).

Memory vs. Disk: The default behavior is "session-based" (In-memory). A cookie is only written to the client's file system (disk) if an Expiration is configured in the persistence profile (Option D is false).