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| Section | Weight | Objectives |
|---|---|---|
| Topic 1: Modify and Manage Virtual Servers | 50% | - Apply persistence profiles - Verify pool configurations associated with virtual servers - Configure encryption and protocol profiles - Identify and work with iApp objects and iRules - Configure and modify virtual server properties |
| Topic 2: Modify and Manage Pools | 50% | - Implement health monitors for pools - Set priority groups and service port configurations - Configure and modify pool settings - Configure load balancing methods |
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NEW QUESTION # 86
Which Virtual Server type prevents the use of a default pool?
Answer: A
Explanation:
Forwarding (IP) virtual servers forward traffic based on routing decisions and do not use pools or pool members.
NEW QUESTION # 87
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,D
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 # 88
What would be the best persistence method for F5 to load balance traffic from clients via a single source IP (NAT) to multiple pool members with even distribution for an HTTPS web application?
Answer: A
Explanation:
When clients connect through a single source IP (NAT) - such as a corporate proxy or carrier-grade NAT
- Source Address Affinity persistence becomes entirely ineffective because all clients share an identical source IP address. This would force every client session to the same pool member, completely eliminating even distribution and defeating the purpose of load balancing.
Cookie Persistence is the optimal solution in this scenario because it operates at Layer 7 , inserting a unique cookie into each client ' s HTTP/HTTPS response. Each individual browser session carries its own distinct cookie value, allowing the BIG-IP to identify and persist individual clients to specific pool members - regardless of whether they share a common source IP address. This guarantees both session persistence and even load distribution across pool members.
The remaining options are unsuitable because:
* Destination Address Affinity persists based on destination IP, irrelevant for client-to-server session stickiness.
* SSL Persistence uses the SSL Session ID for persistence, but SSL session IDs are frequently renegotiated and are unreliable for long-term persistence across modern TLS implementations.
* Source Address Affinity fails entirely under NAT conditions as described.
Cookie persistence is the industry-standard method for HTTPS application load balancing requiring per-client session affinity.
Reference: BIG-IP Administration - Data Plane Configuration, Module: Persistence Methods - Cookie, Source Address, and SSL Persistence.
NEW QUESTION # 89
Local Traffic Network Map: VS_HTTP # POOL_WEB # 192.168.212.30:80 Pool Member | Parent Node
192.168.212.30 Port 80
Why is the virtual server unresponsive to incoming connections?
Answer: D
Explanation:
In the BIG-IP object hierarchy, a Pool Member is a child object of a Node . A pool member represents a specific IP:Port combination, while the parent node represents the underlying server IP address. When a node is disabled , all pool members that are children of that node are rendered unavailable - regardless of the individual pool member ' s own health or enabled state.
The Network Map depicted shows the pool member (192.168.212.30:80) with its Parent Node (192.168.212.30) disabled. This parent-child dependency means that even if the pool member itself is healthy and enabled, the disabled node cascades its unavailable state downward, causing the pool to have no available members and rendering VS_HTTP unresponsive to incoming connections.
The other options can be eliminated as follows:
* Pool member monitor failed - the monitor status is not indicated as failed in the Network Map display.
* Pool member is disabled - the pool member itself is not shown as disabled; the parent node is.
* Node monitor failed - no monitor failure is indicated; the node ' s administrative state is explicitly disabled.
Understanding the node-to-member inheritance of availability state is fundamental to accurate BIG-IP traffic troubleshooting.
Reference: BIG-IP Administration - Data Plane Configuration, Module: Pool Members, Nodes, and Availability State Inheritance.
NEW QUESTION # 90
The BIG-IP Administrator has to provide encrypted communication between users and the virtual server they access. Multiple hostnames are configured in DNS with the same IP address.
Which profile type and setting in the profile should be used? (Choose one answer)
Answer: A
Explanation:
When multiple hostnames resolve to the same IP address and encrypted communication is required, the BIG-IP must be able to present the correct SSL certificate based on the hostname requested by the client. This is accomplished using Server Name Indication (SNI).
According to BIG-IP Administration: Data Plane Configuration documentation:
SNI is a client-side TLS extension, where the client includes the requested hostname during the SSL handshake.
BIG-IP evaluates this hostname using the Client SSL profile, not the Server SSL profile.
The "Server Name" setting in the Client SSL profile enables BIG-IP to select the appropriate SSL certificate for the requested hostname.
Why option C is correct:
Client SSL profile handles inbound (client-side) encryption.
Server Name enables SNI-based certificate selection when multiple DNS names share the same virtual server IP.
Why the other options are incorrect:
A . Client SSL, Client Name
There is no Client SSL setting called Client Name for SNI certificate selection.
B . Server SSL, Server Name
Server SSL is used for encryption between BIG-IP and backend servers, not for client-side hostname identification.
D . Server SSL, Client Name
Server SSL does not process client-requested hostnames during TLS negotiation.
Correct Resolution:
Configure a Client SSL profile and enable the Server Name (SNI) setting to support multiple encrypted hostnames on the same virtual server IP.
NEW QUESTION # 91
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