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F5 F5CAB5 Exam Syllabus Topics:

TopicDetails
Topic 1
  • Determine resource utilization: This domain covers analyzing system resources including control plane versus data plane usage, CPU statistics per virtual server, interface statistics, and disk and memory utilization.
Topic 2
  • Identify the reason a virtual server is not working as expected: This section covers diagnosing virtual server issues including availability status, profile conflicts and misconfigurations, and incorrect IP addresses or ports.
Topic 3
  • Identify the reason load balancing is not working as expected: This domain addresses troubleshooting load balancing by analyzing persistence, priority groups, rate limits, health monitor configurations, and availability status.
Topic 4
  • Given a scenario, interpret traffic flow: This domain covers understanding traffic patterns through client-server communication analysis and interpreting traffic graphs and SNMP results.
Topic 5
  • Given a scenario, review basic stats to confirm functionality: This section involves interpreting traffic object statistics and network configuration statistics to validate system functionality.

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F5 BIG-IP Administration Support and Troubleshooting Sample Questions (Q28-Q33):

NEW QUESTION # 28
A BIG-IP Administrator configured the following virtual server to pass traffic on all addresses and ports. After configuration is completed, the BIG-IP Administrator notices that the virtual server is unable to pass traffic.
ltm virtual forwarding_any_vs {
destination 0.0.0.0:any
ip-forward
mask 255.255.255.255
profiles {
fastL4 { }
}
serverssl-use-sni disabled
source 0.0.0.0/0
translate-address disabled
translate-port disabled
}
Which part of the configuration is the cause of the issue? (Choose one answer)

Answer: B

Explanation:
This virtual server is intended to function as a forwarding (IP-forwarding) virtual server, which is commonly used for routing or firewall-style deployments where BIG-IP forwards traffic transparently without load balancing or address translation. For a forwarding virtual server to match and pass all traffic, the destination must be configured as 0.0.0.0:any with a mask of 0.0.0.0, not 255.255.255.255.
The configured mask 255.255.255.255 represents a /32 host mask, which restricts the virtual server to matching traffic destined only for the exact IP address 0.0.0.0. Since 0.0.0.0 is not a valid routable destination for normal traffic, no packets will ever match the virtual server, causing it to pass no traffic at all.
This is a well-documented BIG-IP behavior:
destination 0.0.0.0:any
mask 0.0.0.0
together define a catch-all forwarding virtual server.
The destination itself (Option A) is correct for a forwarding VS, and disabling address translation (Option C) is expected and required for IP-forwarding mode. Therefore, the incorrect subnet mask is the sole reason the virtual server is not functioning as expected.


NEW QUESTION # 29
During a high-demand traffic event, the BIG-IP Administrator needs to limit the number of new connections per second allowed to a Virtual Server. What should the administrator apply to accomplish this task?

Answer: D

Explanation:
F5 BIG-IP provides two distinct ways to throttle traffic on a Virtual Server: total capacity and velocity.
Connection Rate Limit: This setting specifically controls the number of new connection attempts per second. It is the correct tool for managing traffic spikes and protecting backend resources from being overwhelmed by a high frequency of new requests.
Comparison (Connection Limit): A standard Connection Limit (Option C) restricts the total concurrent connections allowed at any one time, regardless of how fast they arrive.


NEW QUESTION # 30
Exhibit:

A BIG-IP Administrator configured a virtual server with a pool of 3 members and selected the Round Robin load balancing method to evenly distribute traffic across the pool members. During initial testing, traffic was not evenly distributed and the pool member 172.16.20.3 received more traffic than the other pool members.
Refer to the exhibit and the virtual server configuration provided below:
Plaintext
ltm virtual http.vs {
destination 10.10.1.100:http
ip-protocol tcp
mask 255.255.255.255
persist {
source_addr { default yes }
}
pool http.pool
profiles {
tcp{}
}
serverssl-use-sni disabled
source 0.0.0.0/0
source-address-translation {
type automap
}
translate-address enabled
}
What is the most likely cause of this behavior?

Answer: C

Explanation:
The primary reason for the uneven traffic distribution is the presence of a Persistence Profile in the virtual server configuration.
Load Balancing vs. Persistence: While the Round Robin method is designed to distribute new connections sequentially among pool members, Persistence overrides this logic for existing clients.
Source Address Persistence: The configuration shows source_addr persistence is enabled. This ensures that once a client (identified by their source IP) is mapped to a pool member, all subsequent connections from that same IP will be sent to the same member for the duration of the persistence record.
Uneven Distribution Logic: If one source IP address generates significantly more connections or longer-lived sessions than others-or if many clients appear behind a single NAT/Proxy IP-that specific pool member (in this case, 172.16.20.3) will receive a disproportionate amount of traffic compared to the others.
Evaluating Other Options:
Automap (Option A): SNAT Automap changes the source IP between the BIG-IP and the pool member. It does not impact the BIG-IP's ability to load balance incoming client requests.
Ratio Settings (Option B): In the provided exhibit, the pool members have a Ratio of 1, 2, and 3 respectively. While a higher ratio does direct more traffic to a member, the question asks for the "most likely cause" in the context of the provided ltm virtual configuration, which explicitly highlights the persistence override.
HTTP Profile (Option C): Round Robin is a Layer 4 load balancing algorithm and does not require a Layer 7 HTTP profile to function.


NEW QUESTION # 31
Which process is most likely responsible for high traffic processing CPU usage?

Answer: D

Explanation:
TMM handles traffic processing and is usually responsible for high CPU under load.


NEW QUESTION # 32
Refer to Exhibit:

An organization is reporting slow performance accessing their Intranet website, hosted in a public cloud. All employees use a single Proxy Server with the public IP of 104.219.110.168 to connect to the Internet. What should the BIG-IP Administrator of the Intranet website do to fix this issue?

Answer: A

Explanation:
This scenario describes a classic network performance issue known as the "Mega-Proxy" problem. When an organization routes all employee traffic through a single proxy server, the BIG-IP sees thousands of unique users as having the exact same source IP address. If the administrator has configured "Source Address Affinity" persistence, the BIG-IP will correctly follow the rule but incorrectly route all users to the same single backend pool member. This creates a severe load imbalance where one server is overwhelmed while others remain idle, leading to poor application response times. To resolve this, the administrator must change the persistence profile to "HTTP Cookie". Cookie-based persistence allows the BIG-IP to place a unique identifier in each user's browser, allowing the system to distinguish between individual sessions even if they share the same source IP. This fix ensures that traffic is distributed evenly across the pool members, restoring4 the expect5ed load balancing functionality and resolving the slow performance reported by users behind the corporate proxy.


NEW QUESTION # 33
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