F5CAB2 Exam Bible & F5CAB2 Examcollection Questions Answers

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F5 F5CAB2 Exam Syllabus Topics:

TopicDetails
Topic 1
  • Identify the different virtual server types: This domain covers BIG-IP virtual server types: Standard, Forwarding, Stateless, Reject, Performance Layer 4, and Performance HTTP.
Topic 2
  • Explain high availability (HA) concepts: This domain addresses HA concepts including integrity methods, implementation approaches, and advantages of high availability configurations.
Topic 3
  • their status
  • statistics: This domain covers BIG-IP networking components including interfaces, trunks, VLANs, self-IPs, and routes, their dependencies and status, plus predicting traffic paths and egress IPs.

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F5 BIG-IP Administration Data Plane Concepts (F5CAB2) Sample Questions (Q66-Q71):

NEW QUESTION # 66
An application is configured so that the same pool member must be used for an entire session, and this behavior must persist across HTTP and FTP traffic. A user reports that a session terminates and must be restarted after the active BIG-IP device fails over to the standby device.
Which configuration settings should the BIG-IP Administrator verify to ensure proper behavior when BIG-IP failover occurs? (Choose one answer)

Answer: D

Explanation:
This scenario combines session continuity, multiple protocols (HTTP and FTP), and HA failover behavior
, which directly implicates persistence handling across devices and services.
Key Requirements Breakdown
* Same pool member for entire session
* Session must survive failover
* Session must span multiple services (HTTP and FTP)
Why Persistence Mirroring + Match Across Services Is Required
Persistence Mirroring
* Ensures persistence records are synchronized from the active BIG-IP to the standby BIG-IP.
* Without mirroring:
* After failover, the standby device has no persistence table
* Clients are load-balanced again
* Sessions break, forcing users to restart
* Persistence mirroring is essential for session continuity during failover Match Across Services
* Allows a single persistence record to be shared across multiple virtual servers / protocols
* Required when:
* HTTP and FTP must use the same pool member
* Multiple services are part of a single application session
Together, these settings ensure:
* Persistence survives device failover
* Persistence is honored across HTTP and FTP
Why the Other Options Are Incorrect
* A. Cookie persistence and session timeoutCookie persistence only applies to HTTP and does not address FTP or failover synchronization.
* B. Stateful failover and Network Failover detectionStateful failover applies to connection state, not persistence records, and does not link HTTP and FTP sessions.
* D. SYN-cookie insertion threshold and connection low-water markThese are DoS / SYN flood protection settings, unrelated to persistence or HA behavior.


NEW QUESTION # 67
What type of virtual server should be used to block responses for one IP in a subnet with a virtual server?
(Choose one answer)

Answer: A

Explanation:
In the BIG-IP system, when you need to prevent traffic from reaching a specific destination or being processed by the system, you utilize specific Virtual Server types that act as "denial" points.
* Reject Virtual Servers: When a packet matches a Reject virtual server, the BIG-IP system stops the packet from being processed and sends a reset (RST) in the case of TCP, or an ICMP unreachable message in the case of UDP. This is the preferred method for "blocking" specific IPs when you want the sender to receive immediate notification that the connection was refused.
* Drop Virtual Servers: A Drop virtual server simply discards the packet without sending any response back to the source. While effective for "stealthing" a network, it is often less desirable for standard administration unless specifically mitigating a DoS attack.
* Comparison with Standard: A Standard virtual server is used to process and load balance traffic to a pool of members; it does not inherently act as a "blocking" mechanism for a single IP within a subnet unless combined with complex iRules or Packet Filters.
* Context of the Question: To block responses (or connection attempts) for a specific IP while other traffic in the subnet might be handled by more permissive virtual servers, a more specific (higher precedence) Reject virtual server is the standard administrative approach.


NEW QUESTION # 68
The owner of a web application asks the BIG-IP Administrator to change the port that the BIG-IP device sends traffic to. This change must be made for each member in the server pool named app_pool for the Virtual Server named app_vs. In which area of the BIG-IP Configuration Utility should the BIG-IP Administrator make this change?

Answer: C

Explanation:
In the BIG-IP object hierarchy, the destination port for backend traffic is defined at thePool Memberlevel.
While a Virtual Server listens on a specific port, the Pool determines where that traffic is directed after the load balancing decision is made.
* Pools and Pool Members: A pool is a collection of devices, often called pool members, to which the BIG-IP system passes traffic. Each pool member is defined by an IP address and a service port.
* Port Translation: When an administrator needs to change the port the BIG-IP uses to communicate with backend servers, they must navigate to the specific Pool and modify the service port for each member within that pool.
* Logical Separation:
* Virtual Serversdefine the "front-end" port where clients connect.
* Poolsdefine the "back-end" port where the application resides.
* Nodesrepresent the physical server's IP address and do not contain port-specific configuration.


NEW QUESTION # 69
A BIG-IP Administrator has a cluster of devices. What should the administrator do after creating a new Virtual Server on device 1?

Answer: A

Explanation:
F5 BIG-IP uses aConfigSyncmechanism to ensure that all members of a Device Service Cluster (DSC) share the same configuration.
* Manual Synchronization:By default, configuration changes made on one device (the "source") do not automatically propagate to other members.
* Direction of Sync:Once a Virtual Server is created on device 1, that device's configuration is now
"newer" than the rest of the group. The administrator must initiate a synchronization from themodified device (device 1) to the Sync-Failover group.
* Consistency:This ensures that if a failover occurs, device 2 (the standby) will have the exact same Virtual Server configuration and can take over traffic immediately without interruption.


NEW QUESTION # 70
Which of the following lists the order of preference from most preferred to least preferred when BIG-IP processes and selects a virtual server? (Choose one answer)

Answer: C

Explanation:
The BIG-IP system uses a specific precedence algorithm to determine which virtual server (listener) should process an incoming packet when multiple virtual servers might match the criteria. Since BIG-IP version 11.3.0, the system evaluates three primary factors in a fixed order of importance:
Destination Address: The system first looks for the most specific destination match. A "Host" address (mask /32) is preferred over a "Network" address (mask /24, /16, etc.), which is preferred over a "Wildcard" (0.0.0.0/0).
Source Address: If multiple virtual servers have identical destination masks, the system then evaluates the source address criteria. Again, a specific source host match is preferred over a source network or a wildcard source.
Service Port: Finally, if both destination and source specifications are equal, the system checks the port. A specific port match (e.g., 80) is preferred over a wildcard port (e.g., or 0).
Following this logic, a virtual server configured with a specific destination host, a specific source host, and a specific service port represents the highest level of specificity and thus the highest preference.


NEW QUESTION # 71
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