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F5 F5CAB3 Exam Syllabus Topics:

TopicDetails
Topic 1
  • Apply procedural concepts required to modify and manage pools: This domain addresses managing server pools including health monitors, load balancing methods, priority groups, and service port configurations.
Topic 2
  • Apply procedural concepts required to modify and manage virtual servers: This domain covers managing virtual servers including applying persistence, encryption, and protocol profiles, identifying iApp objects, reporting iRules, and showing pool configurations.

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F5 BIG-IP Administration Data Plane Configuration Sample Questions (Q10-Q15):

NEW QUESTION # 10
Which Virtual Server type prevents the use of a default pool?

Answer: B

Explanation:
Forwarding (IP) virtual servers operate at Layer 3 and forward traffic based on routing, not pools.


NEW QUESTION # 11
In a pool there are 2 pool members out of the 5 members that are older servers. The number of connections these can handle is less than the other 3 pool members. Which load balancing method would allow more traffic to be directed to the newer servers? (Choose one answer)

Answer: A

Explanation:
When a pool contains servers with heterogeneous hardware capabilities (differing CPU, RAM, or connection limits), a static load balancing method like Round Robin is ineffective because it distributes requests equally, regardless of the server's capacity. To optimize traffic distribution for newer, more powerful servers, a dynamic or weighted method is required.
* Weighted Least Connections (member): This is the ideal method for this scenario. It combines two factors:
* Least Connections: It first checks the current active connection count to ensure traffic goes to the least busy server.
* Weight (Ratio): It allows the administrator to assign a "Ratio" value to each pool member. Newer servers can be assigned a higher ratio (e.g., 3) while older servers are assigned a lower ratio (e.g.,
1). The BIG-IP system uses these weights to disproportionately favor the newer servers even when connection counts are similar.
* Why other options are incorrect:
* Global Availability: This is primarily a GSLB (Global Server Load Balancing) or specific LTM priority group concept where traffic is sent to the first available member in a list until it fails, then moves to the next. It does not load balance based on capacity.
* Round Robin: This passes each new connection request to the next server in line, treating the old and new servers exactly the same.
* Least Connections (member): While this sends traffic to the server with the fewest active connections, it assumes all servers are equal. If an old server and a new server both have 10 connections, they are treated as equally capable of taking the 11th, which is not true in this scenario.


NEW QUESTION # 12
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? (Choose one answer)

Answer: B

Explanation:
This scenario describes a classic case of asymmetric routing in a "one-arm" or non-gateway deployment.
When a BIG-IP system is configured for SSL offloading, the following traffic flow occurs:
Client-Side: The client establishes a successful SSL/TLS handshake with the Virtual Server. This explains why the user can "successfully establish an SSL connection." Server-Side: The BIG-IP decrypts the traffic and forwards it as plain HTTP to the backend server. The packet trace confirms the server receives the HTTP GET request and responds with the content.
The Routing Failure: By default, the BIG-IP system preserves the client's original source IP address. If the backend server's default gateway is not the BIG-IP system (or if the server is on the same subnet as the client), the server will attempt to send the response directly back to the client's IP address, bypassing the BIG-IP.
Stateful Drop: Because the BIG-IP is a Full Proxy, it expects the response to return through its own internal state table to be encrypted and sent back to the client. Since the response bypasses the BIG-IP, the BIG-IP connection eventually times out, and the client receives no data despite the server having sent it.
Solution (SNAT): Enabling Secure Network Address Translation (SNAT), specifically SNAT Auto Map, ensures that the BIG-IP replaces the client's source IP with its own internal self-IP before sending the request to the server. This forces the server to send the response back to the BIG-IP, allowing the BIG-IP to complete the transaction and deliver the content to the user.


NEW QUESTION # 13
The BIG-IP Administrator needs to load balance a pool of web servers. Load balancing should consider the number of connections that are active on that pool member.
Which load balancing method meets this requirement? (Choose one answer)

Answer: A

Explanation:
The requirement states that load balancing decisions must be based on the number of active connections on each pool member. This directly maps to the Least Connections (member) load balancing method.
According to the BIG-IP Administration: Data Plane Configuration documentation:
Least Connections (member) selects the pool member with the fewest active connections at the time of the request.
This method dynamically adapts to real-time traffic patterns and ensures that more heavily loaded pool members receive fewer new connections.
It is especially effective for web servers where connection duration may vary and equal distribution of active sessions is desired.
Why the other options are incorrect:
B . Round Robin
Distributes connections sequentially without considering current load or active connections.
C . Ratio (member)
Distributes traffic based on static ratios, not real-time connection counts.
D . Ratio (node)
Uses predefined ratios at the node level and does not account for active connection counts.
Correct Resolution:
Using Least Connections (member) ensures that new connections are directed to the pool member currently handling the fewest active connections, meeting the stated requirement.


NEW QUESTION # 14
A BIG-IP Administrator creates a new VLAN on BIG-IP Cluster Member A and attaches an interface to it.
Although the Auto Config Sync is in place, the new VLAN does NOT show up on Cluster Member B. What should the BIG-IP Administrator do to ensure the new VLAN is configured on each Cluster Member?

Answer: C

Explanation:
In a BIG-IP High Availability (HA) environment, most configuration objects (Virtual Servers, Pools, iRules) are considered " shared " and are synchronized automatically between devices. However, network-level objects-specifically VLANs and Self IPs-are unique to the hardware and are generally not synchronized by the ConfigSync process.
This is intentional because two devices in a cluster may have different physical cabling or interface assignments. For example, Cluster Member A might use interface 1.1 for a specific VLAN, while Cluster Member B might use interface 1.2. Because the BIG-IP system cannot assume that the physical network topology is identical for both appliances, the administrator must Configure the new VLAN manually on Cluster Member B.
Once the VLAN is created manually on both devices with the exact same name, it can then be used to host " shared " floating Self IP addresses or traffic groups that will synchronize. Failing to create the VLAN on the peer device will prevent the traffic group from failing over correctly, as the peer will not have the necessary Layer 2 broadcast domain defined to take over the traffic. Resetting Device Trust (Option D) is a drastic step for fix sync communication issues but will not change the fact that VLANs are non-syncable objects.
Enabling the interface (Option B) only affects the link status of Member A and has no impact on the configuration of Member B.


NEW QUESTION # 15
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