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NEW QUESTION # 15
Which persistence profile would be the most appropriate to ensure an HTTP web request connects to the same pool member? (Choose one answer)
Answer: A
Explanation:
For HTTP-based applications, cookie persistence is the most appropriate and commonly recommended persistence method.
According to the BIG-IP Administration: Data Plane Configuration documentation:
* Cookie persistence inserts or uses an HTTP cookie to maintain session affinity.
* It operates at Layer 7 (HTTP) and is application-aware.
* It allows persistence to be maintained even when multiple clients are behind a NAT device.
Why the other options are incorrect:
* A. Destination addressDestination address persistence is generally used for inbound traffic patterns such as firewall or proxy scenarios.
* B. Hash persistenceHash persistence is less granular and not HTTP-specific.
* C. SSL persistenceSSL persistence is typically used when SSL session IDs are reused and is less reliable than cookies for HTTP applications.
Correct Resolution:
Using cookie persistence ensures that HTTP web requests are consistently directed to the same pool member.
NEW QUESTION # 16
During a high-demand event, the BIG-IP Administrator needs to limit the number of new connections per second to a Virtual Server.
What should be applied?
Answer: D
Explanation:
Connection rate limits restrict how many new connections are accepted per second, protecting application resources.
NEW QUESTION # 17
Which two load balancing methods consider all the connections the BIG-IP has between it and each backend application server (Pool Member) when making a load balancing decision for a new connection?
Answer: A,C
Explanation:
The two load balancing methods that consider all connections between the BIG-IP and each backend node
- not just connections to a specific pool member - are Least Connections (node) and Weighted Least Connections (node) .
The critical distinction here lies in the node-level scope of evaluation. A node represents the backend server ' s IP address, regardless of how many services or ports it may be serving. Therefore:
* Least Connections (node) directs new connections to the node with the fewest total active connections across all services on that server, providing a holistic connection-count perspective.
* Weighted Least Connections (node) operates identically but factors in an administrator-defined ratio weight, allowing servers with greater capacity to proportionally absorb more connections while still evaluating total node-level connection counts.
By contrast:
* Ratio (member) distributes traffic based on a static weight ratio and does not dynamically evaluate current connection counts.
* Round Robin distributes traffic sequentially in rotation, completely ignoring current connection states on any node or member.
The node-based methods are particularly valuable in environments where a single backend server hosts multiple pool members across different ports, ensuring the server ' s overall load - not just per-service load
- governs balancing decisions.
Reference: BIG-IP Administration - Data Plane Configuration, Module: Load Balancing Methods - Member vs. Node Scope.
NEW QUESTION # 18
In a pool there are 2 pool members (older servers) that can handle fewer connections than the other 3 newer servers.
Which load balancing method would allow more traffic to be directed to the newer servers? (Choose one answer)
Answer: B
Explanation:
This scenario requires unequal load distribution based on server capacity. The newer servers must receive more connections than the older ones, while still dynamically accounting for active connection counts.
According to BIG-IP Administration: Data Plane Configuration documentation:
Weighted Least Connections (member) combines:
Connection awareness (least connections)
Administrator-defined weights (ratios) to reflect server capacity
Pool members with higher weights receive proportionally more new connections than members with lower weights, even when using the same load balancing algorithm.
Why B is correct:
Allows assigning higher weights to newer servers and lower weights to older servers Ensures smarter traffic distribution based on both capacity and real-time load Why the other options are incorrect:
A). Global AvailabilityUsed for disaster recovery and site failover, not intra-pool load distribution.
C). Round RobinDistributes connections evenly without considering server capacity.
D). Least Connections (member)Balances only by current connection count and does not account for differences in server performance or capacity.
Correct Resolution:
Use Weighted Least Connections (member) and assign higher weights to newer servers so they receive more traffic while protecting older servers from overload.
NEW QUESTION # 19
A virtual server is configured to offload SSL from a pool of backend servers. When users connect to the virtual server, they successfully establish an SSL connection but no content is displayed. A packet trace performed on the server shows that the server receives and responds to the request. What should a BIG-IP Administrator do to resolve the problem?
Answer: A
Explanation:
This scenario describes a classic routing issue often encountered during SSL offload deployments. The fact that an SSL connection is established indicates the Client SSL profile is working correctly. The packet trace showing the server "receives and responds" to the request is the most critical diagnostic clue.
When a BIG-IP receives traffic, it typically passes the client's original source IP address to the backend server. If the backend server's default gateway is not the BIG-IP (a common "one-arm" network topology), the server will attempt to send its response directly back to the client's IP via its own default router. The client's browser will reject this response because it expects traffic to come from the Virtual Server's IP, not the backend server's IP.
To resolve this, the administrator must enable SNAT (Source Address Translation), typically using SNAT Automap. When SNAT is enabled, the BIG-IP replaces the client's original source IP with one of its own Self IPs before forwarding the request to the server. Because the source of the packet is now the BIG-IP, the backend server is forced to send its response back to the BIG-IP. The BIG-IP then receives the response, translates it back, and delivers the content to the user. Option A is unnecessary if the servers are expecting plain-text traffic after the BIG-IP performs offload. Option D would only worsen the existing routing discrepancy.
NEW QUESTION # 20
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