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[General] F5CAB3 Exam Pass Guide | Exam F5CAB3 Assessment

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【General】 F5CAB3 Exam Pass Guide | Exam F5CAB3 Assessment

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F5 BIG-IP Administration Data Plane Configuration Sample Questions (Q13-Q18):NEW QUESTION # 13
A BIG-IP Administrator uses backend servers to host multiple services per server. There are multiple virtual servers and pools defined, referencing the same backend servers.
Which load balancing algorithm is most appropriate to have an equal number of connections on each backend server? (Choose one answer)
  • A. Least Connections (node)
  • B. Predictive (member)
  • C. Predictive (node)
  • D. Least Connections (member)
Answer: A
Explanation:
In this scenario, each backend node (server) hosts multiple services and is referenced by multiple pools and virtual servers. The goal is to ensure an equal number of total connections per backend server, regardless of how many pool members (services/ports) exist on that server.
According to the BIG-IP Administration: Data Plane Configuration documentation:
* Least Connections (node) tracks the total number of active connections to a node across all pool members and services.
* This algorithm ensures load distribution is balanced at the server level, not just at the individual service (member) level.
* It is specifically recommended when:
* Multiple pool members exist on the same backend server
* Multiple virtual servers reference the same backend servers
Why the other options are incorrect:
* B. Predictive (member)Predictive algorithms are advanced and traffic-pattern based, but they operate at the member level and do not guarantee equal connections per server.
* C. Least Connections (member)This balances connections per pool member, which can overload a server hosting multiple members while still appearing "balanced" per member.
* D. Predictive (node)Although node-aware, predictive algorithms are less deterministic and not the best choice when strict equality of connections is required.
Correct Resolution:
Using Least Connections (node) ensures that each backend server carries an equal connection load across all services and pools.

NEW QUESTION # 14
Users report that traffic is negatively affected every time a BIG-IP device fails over. The traffic becomes stabilized after a few minutes. What should the BIG-IP Administrator do to reduce the impact of future failovers?
  • A. Set up Failover Method to HA Order
  • B. Configure MAC Masquerade
  • C. Configure a global SNAT Listener
  • D. Enable Failover Multicast Configuration
Answer: B
Explanation:
When a failover occurs in a standard BIG-IP High Availability (HA) pair, the newly active device takes over the floating IP addresses (Virtual Servers, Self IPs). By default, the new active device sends Gratuitous ARP (GARP) messages to the local network switch to inform it that these IP addresses are now associated with its own physical MAC addresses. However, network switches and intermediate routers often have ARP aging timers or security features that may delay the updating of their ARP tables, leading to "black-holed" traffic or dropped packets for several seconds or minutes until the network infrastructure correctly relearns the new path.
To eliminate this delay and ensure a seamless transition, a BIG-IP Administrator should Configure MAC Masquerade. MAC Masquerade allows the administrator to assign a unique, "virtual" MAC address to a specific traffic group. Instead of using the hardware-burned MAC address of the individual appliance, the active device uses this shared virtual MAC address for all communication involving floating IPs. When a failover occurs, the standby device assumes control of the traffic group and begins using the exact same virtual MAC address. Because the MAC address associated with the VIPs never changes from the switch's perspective, there is no need for the switch to update its MAC address table or for the surrounding infrastructure to update its ARP caches. This effectively eliminates the "stabilization period" reported by users, as the data plane transition happens almost instantaneously at Layer 2, maintaining continuous traffic flow without being hindered by external network re-convergence times.

NEW QUESTION # 15
A node is a member of multiple pools and hosts different applications. If one application becomes unavailable, only that pool member should be marked down.
What should the BIG-IP Administrator deploy?
  • A. UDP monitor
  • B. HTTP monitor with custom send/receive
  • C. TCP monitor
  • D. ICMP + TCP monitor
Answer: B
Explanation:
Application-level monitors ensure that only the affected service is marked down, not the entire node.

NEW QUESTION # 16
A Standard Virtual Server reports poor performance for Internet users.
What TCP profile configuration should be applied?
  • A. Client: f5-tcp-lan
  • B. Client: f5-tcp-lan / Server: f5-tcp-wan
  • C. Client: f5-tcp-optimized
  • D. Client: f5-tcp-wan / Server: f5-tcp-lan
Answer: D
Explanation:
WAN-optimized TCP profiles improve performance for high-latency Internet clients, while LAN profiles are optimal for backend servers.

NEW QUESTION # 17
A Standard Virtual Server for a web application is configured with Automap for Source Address Translation.
The original client IP must be known by backend servers.
What should the BIG-IP Administrator configure?
  • A. Performance (HTTP) Virtual Server
  • B. SNAT pool using client IP
  • C. HTTP profile to insert X-Forwarded-For
  • D. HTTP Transparent profile
Answer: C
Explanation:
The X-Forwarded-For header preserves the original client IP when SNAT is enabled.

NEW QUESTION # 18
......
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